#cavitation — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #cavitation, aggregated by home.social.
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https://www.europesays.com/fr/1053943/ Ni cri, ni choc : la science découvre enfin d’où vient le vacarme de 220 décibels de cette crevette de quelques centimètres #bioacoustique #cavitation #CrevettePistolet #FR #France #PhysiqueDesFluides #Push #Science #ScienceAndTechnology #Sciences #SciencesEtTechnologies #Technologies #Technology #VieMarine
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Brewing Espresso with Ultrasonic Assistance
https://fed.brid.gy/r/https://hackaday.com/2026/06/21/brewing-espresso-with-ultrasonic-assistance/
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Brewing Espresso with Ultrasonic Assistance
https://fed.brid.gy/r/https://hackaday.com/2026/06/21/brewing-espresso-with-ultrasonic-assistance/
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What happens when cavitation bubbles collapse in liquid metal coolants?
This study combines simulations and ultrasonic experiments to link bubble collapse dynamics with surface damage in lead-bismuth eutectic used for advanced nuclear reactors.
🔗 https://pubs.aip.org/aip/pof/article/38/4/042006/3386755/Temperature-driven-cavitation-lead-bismuth
#Cavitation #FluidDynamics #NuclearEngineering #LiquidMetals #MaterialsScience
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What happens when cavitation bubbles collapse in liquid metal coolants?
This study combines simulations and ultrasonic experiments to link bubble collapse dynamics with surface damage in lead-bismuth eutectic used for advanced nuclear reactors.
🔗 https://pubs.aip.org/aip/pof/article/38/4/042006/3386755/Temperature-driven-cavitation-lead-bismuth
#Cavitation #FluidDynamics #NuclearEngineering #LiquidMetals #MaterialsScience
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When two cavitation bubbles form near a particle in sequence, their collapse is no longer independent. The second bubble reshapes the jet from the first, creating regimes of deflection, amplification or damping depending on timing.
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When two cavitation bubbles form near a particle in sequence, their collapse is no longer independent. The second bubble reshapes the jet from the first, creating regimes of deflection, amplification or damping depending on timing.
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Sonoluminescence: Light from Collapsing Bubbles
Definition
Sonoluminescence is the emission of short flashes of light when gas bubbles in a liquid rapidly collapse under the influence of an acoustic (ultrasonic) field.---
Physical Mechanism
The process is driven by an oscillating pressure field:
1. Acoustic forcing: An ultrasonic wave creates alternating rarefaction and compression phases in the liquid.
2. Bubble nucleation and growth: During rarefaction, microbubbles form and expand.
3. Violent collapse: In the compression phase, the bubbles implode symmetrically.
4. Extreme conditions: At collapse, the bubble interior reaches:
Temperatures on the order of 10⁴ K
Pressures of hundreds of atmospheres
5. Light emission: A sub-nanosecond flash is produced.
This behavior is a manifestation of Cavitation under controlled acoustic excitation.
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Emission Mechanisms (Competing Models)
Thermal (blackbody-like) radiation from a highly compressed, heated gas core
Plasma formation with ionization and radiative recombination
Bremsstrahlung due to rapid deceleration of charged particles
No single model fully explains all observed spectra and timing; current consensus suggests a combination of these effects.
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Regimes
Single-Bubble Sonoluminescence (SBSL): A stable, trapped bubble emitting periodic flashes synchronized with the driving frequency
Multi-Bubble Sonoluminescence (MBSL): A cloud of bubbles producing spatially distributed, less coherent emission
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Experimental Signatures
Point-like, blue-white flashes in a dark liquid
Strict synchronization with the acoustic cycle
Sensitivity to dissolved gas type, liquid purity, and acoustic amplitude
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Significance
Sonoluminescence provides a laboratory-scale platform to study:
Extreme thermodynamic states in microscale volumes
Nonlinear acoustics and bubble dynamics
Energy focusing and potential plasma formation in liquids
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Conclusion
Sonoluminescence is a robust, experimentally verified phenomenon where acoustic energy is concentrated into a microscopic volume, producing light via extreme compression of a gas bubble.
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#Sonoluminescence #Cavitation #UltrasoundPhysics #BubbleDynamics #NonlinearAcoustics #PlasmaPhysics #FluidDynamics #ExtremeConditions #AcousticEnergy #PhysicsExperiments #LightEmission #ScientificPhenomena
https://bastyon.com/svalmon37?ref=PJ51iZCUEtcVrCj4Wof8Am7FbKLgbAJ7PS
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Sonoluminescence: Light from Collapsing Bubbles
Definition
Sonoluminescence is the emission of short flashes of light when gas bubbles in a liquid rapidly collapse under the influence of an acoustic (ultrasonic) field.---
Physical Mechanism
The process is driven by an oscillating pressure field:
1. Acoustic forcing: An ultrasonic wave creates alternating rarefaction and compression phases in the liquid.
2. Bubble nucleation and growth: During rarefaction, microbubbles form and expand.
3. Violent collapse: In the compression phase, the bubbles implode symmetrically.
4. Extreme conditions: At collapse, the bubble interior reaches:
Temperatures on the order of 10⁴ K
Pressures of hundreds of atmospheres
5. Light emission: A sub-nanosecond flash is produced.
This behavior is a manifestation of Cavitation under controlled acoustic excitation.
---
Emission Mechanisms (Competing Models)
Thermal (blackbody-like) radiation from a highly compressed, heated gas core
Plasma formation with ionization and radiative recombination
Bremsstrahlung due to rapid deceleration of charged particles
No single model fully explains all observed spectra and timing; current consensus suggests a combination of these effects.
---
Regimes
Single-Bubble Sonoluminescence (SBSL): A stable, trapped bubble emitting periodic flashes synchronized with the driving frequency
Multi-Bubble Sonoluminescence (MBSL): A cloud of bubbles producing spatially distributed, less coherent emission
---
Experimental Signatures
Point-like, blue-white flashes in a dark liquid
Strict synchronization with the acoustic cycle
Sensitivity to dissolved gas type, liquid purity, and acoustic amplitude
---
Significance
Sonoluminescence provides a laboratory-scale platform to study:
Extreme thermodynamic states in microscale volumes
Nonlinear acoustics and bubble dynamics
Energy focusing and potential plasma formation in liquids
---
Conclusion
Sonoluminescence is a robust, experimentally verified phenomenon where acoustic energy is concentrated into a microscopic volume, producing light via extreme compression of a gas bubble.
---
#Sonoluminescence #Cavitation #UltrasoundPhysics #BubbleDynamics #NonlinearAcoustics #PlasmaPhysics #FluidDynamics #ExtremeConditions #AcousticEnergy #PhysicsExperiments #LightEmission #ScientificPhenomena
https://bastyon.com/svalmon37?ref=PJ51iZCUEtcVrCj4Wof8Am7FbKLgbAJ7PS
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When two cavitation bubbles of different sizes collapse, they form distinct jet patterns that affect local pressure and energy distribution.
Understanding these dynamics helps predict damage in hydraulic systems.
🔗 https://doi.org/10.1063/5.0319732
#cavitation #bubbledynamics #fluidmechanics #EnergyTransfer #hydraulics
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When two cavitation bubbles of different sizes collapse, they form distinct jet patterns that affect local pressure and energy distribution.
Understanding these dynamics helps predict damage in hydraulic systems.
🔗 https://doi.org/10.1063/5.0319732
#cavitation #bubbledynamics #fluidmechanics #EnergyTransfer #hydraulics
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Energy redistribution between bubbles depends on initial size and pressure.
Understanding these mechanisms helps improve models of bubble clouds in fluids, relevant from naval to biomedical applications.
🔗 https://doi.org/10.1063/5.0300783
#bubblyliquids #fluiddynamics #bubbledynamics #EnergyTransfer #cavitation
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Observation de l'écoulement d'un fluide autour d'une section cylindrique
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Observation de l'écoulement d'un fluide autour d'une section cylindrique
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“Broken Water, Like Broken Glass”
How can you break water? By accelerating it so quickly that the pressure drop forms cavitation bubbles. Here, a steel piston rests against a transparent plate, all underwater. When a hammer strike accelerates the piston away at around 1000g, the severe pressure drop tears the water into bubbles (bottom, left). As the bubbles expand, the nearby piston squishes them into pancakes (bottom, center). As they continue growing, the bubbles press into one another, squeezing thin ridges of water between them. The result (center) resembles broken glass. (Image credit: J. da Silva et al.)
#2025gofm #cavitation #flowVisualization #fluidDynamics #physics #science -
“Broken Water, Like Broken Glass”
How can you break water? By accelerating it so quickly that the pressure drop forms cavitation bubbles. Here, a steel piston rests against a transparent plate, all underwater. When a hammer strike accelerates the piston away at around 1000g, the severe pressure drop tears the water into bubbles (bottom, left). As the bubbles expand, the nearby piston squishes them into pancakes (bottom, center). As they continue growing, the bubbles press into one another, squeezing thin ridges of water between them. The result (center) resembles broken glass. (Image credit: J. da Silva et al.)
#2025gofm #cavitation #flowVisualization #fluidDynamics #physics #science -
“Broken Water, Like Broken Glass”
How can you break water? By accelerating it so quickly that the pressure drop forms cavitation bubbles. Here, a steel piston rests against a transparent plate, all underwater. When a hammer strike accelerates the piston away at around 1000g, the severe pressure drop tears the water into bubbles (bottom, left). As the bubbles expand, the nearby piston squishes them into pancakes (bottom, center). As they continue growing, the bubbles press into one another, squeezing thin ridges of water between them. The result (center) resembles broken glass. (Image credit: J. da Silva et al.)
#2025gofm #cavitation #flowVisualization #fluidDynamics #physics #science -
“Broken Water, Like Broken Glass”
How can you break water? By accelerating it so quickly that the pressure drop forms cavitation bubbles. Here, a steel piston rests against a transparent plate, all underwater. When a hammer strike accelerates the piston away at around 1000g, the severe pressure drop tears the water into bubbles (bottom, left). As the bubbles expand, the nearby piston squishes them into pancakes (bottom, center). As they continue growing, the bubbles press into one another, squeezing thin ridges of water between them. The result (center) resembles broken glass. (Image credit: J. da Silva et al.)
#2025gofm #cavitation #flowVisualization #fluidDynamics #physics #science -
“Broken Water, Like Broken Glass”
How can you break water? By accelerating it so quickly that the pressure drop forms cavitation bubbles. Here, a steel piston rests against a transparent plate, all underwater. When a hammer strike accelerates the piston away at around 1000g, the severe pressure drop tears the water into bubbles (bottom, left). As the bubbles expand, the nearby piston squishes them into pancakes (bottom, center). As they continue growing, the bubbles press into one another, squeezing thin ridges of water between them. The result (center) resembles broken glass. (Image credit: J. da Silva et al.)
#2025gofm #cavitation #flowVisualization #fluidDynamics #physics #science -
Aus dem Archiv:
Ein roter Laserpuls hat in Wasser eine explodierende Plasmablase gezündet.
Von links erfasst ein hochbrillanter Röntgen-Freie-Elektronen-Laserblitz die Szene holografisch.
Ein Mikrofon zeichnet akustische Signale auf.
An der Wand sehen wir die entstehenden Blasen zu verschiedenen Zeitpunkten.(nächster Trot: Link zum Video)
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Aus dem Archiv:
Ein roter Laserpuls hat in Wasser eine explodierende Plasmablase gezündet.
Von links erfasst ein hochbrillanter Röntgen-Freie-Elektronen-Laserblitz die Szene holografisch.
Ein Mikrofon zeichnet akustische Signale auf.
An der Wand sehen wir die entstehenden Blasen zu verschiedenen Zeitpunkten.(nächster Trot: Link zum Video)
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Aus dem Archiv:
Ein roter Laserpuls hat in Wasser eine explodierende Plasmablase gezündet.
Von links erfasst ein hochbrillanter Röntgen-Freie-Elektronen-Laserblitz die Szene holografisch.
Ein Mikrofon zeichnet akustische Signale auf.
An der Wand sehen wir die entstehenden Blasen zu verschiedenen Zeitpunkten.(nächster Trot: Link zum Video)
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Aus dem Archiv:
Ein roter Laserpuls hat in Wasser eine explodierende Plasmablase gezündet.
Von links erfasst ein hochbrillanter Röntgen-Freie-Elektronen-Laserblitz die Szene holografisch.
Ein Mikrofon zeichnet akustische Signale auf.
An der Wand sehen wir die entstehenden Blasen zu verschiedenen Zeitpunkten.(nächster Trot: Link zum Video)
-
Aus dem Archiv:
Ein roter Laserpuls hat in Wasser eine explodierende Plasmablase gezündet.
Von links erfasst ein hochbrillanter Röntgen-Freie-Elektronen-Laserblitz die Szene holografisch.
Ein Mikrofon zeichnet akustische Signale auf.
An der Wand sehen wir die entstehenden Blasen zu verschiedenen Zeitpunkten.(nächster Trot: Link zum Video)
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What Limits a Siphon
Siphons are a bit mind-boggling for anyone who has internalized the idea that water always flows downhill. But gravity actually allows a siphon’s water to flow up and over an obstacle, provided certain conditions are met. Steve Mould digs into the details of those conditions in this video, where he searches for the maximum height a siphon can reach.
A quick note on terminology: Steve explains that the siphon breaks when water near the top starts “boiling.” Other sources may use the term “cavitating” for this sudden phase change. There’s not–to my knowledge–a generally-agreed-upon definition that clearly distinguishes between boiling and cavitation in this situation. Whichever term you use, the water in the siphon doesn’t care; either way, it’s experiencing a local pressure that’s so low that it switches from a liquid state (where it can resist tensile forces) to a gaseous one (where it cannot resist tension). (Video and image credit: S. Mould)
#cavitation #DIYFluids #fluidDynamics #physics #science #siphon
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What Limits a Siphon
Siphons are a bit mind-boggling for anyone who has internalized the idea that water always flows downhill. But gravity actually allows a siphon’s water to flow up and over an obstacle, provided certain conditions are met. Steve Mould digs into the details of those conditions in this video, where he searches for the maximum height a siphon can reach.
A quick note on terminology: Steve explains that the siphon breaks when water near the top starts “boiling.” Other sources may use the term “cavitating” for this sudden phase change. There’s not–to my knowledge–a generally-agreed-upon definition that clearly distinguishes between boiling and cavitation in this situation. Whichever term you use, the water in the siphon doesn’t care; either way, it’s experiencing a local pressure that’s so low that it switches from a liquid state (where it can resist tensile forces) to a gaseous one (where it cannot resist tension). (Video and image credit: S. Mould)
#cavitation #DIYFluids #fluidDynamics #physics #science #siphon
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What Limits a Siphon
Siphons are a bit mind-boggling for anyone who has internalized the idea that water always flows downhill. But gravity actually allows a siphon’s water to flow up and over an obstacle, provided certain conditions are met. Steve Mould digs into the details of those conditions in this video, where he searches for the maximum height a siphon can reach.
A quick note on terminology: Steve explains that the siphon breaks when water near the top starts “boiling.” Other sources may use the term “cavitating” for this sudden phase change. There’s not–to my knowledge–a generally-agreed-upon definition that clearly distinguishes between boiling and cavitation in this situation. Whichever term you use, the water in the siphon doesn’t care; either way, it’s experiencing a local pressure that’s so low that it switches from a liquid state (where it can resist tensile forces) to a gaseous one (where it cannot resist tension). (Video and image credit: S. Mould)
#cavitation #DIYFluids #fluidDynamics #physics #science #siphon
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What Limits a Siphon
Siphons are a bit mind-boggling for anyone who has internalized the idea that water always flows downhill. But gravity actually allows a siphon’s water to flow up and over an obstacle, provided certain conditions are met. Steve Mould digs into the details of those conditions in this video, where he searches for the maximum height a siphon can reach.
A quick note on terminology: Steve explains that the siphon breaks when water near the top starts “boiling.” Other sources may use the term “cavitating” for this sudden phase change. There’s not–to my knowledge–a generally-agreed-upon definition that clearly distinguishes between boiling and cavitation in this situation. Whichever term you use, the water in the siphon doesn’t care; either way, it’s experiencing a local pressure that’s so low that it switches from a liquid state (where it can resist tensile forces) to a gaseous one (where it cannot resist tension). (Video and image credit: S. Mould)
#cavitation #DIYFluids #fluidDynamics #physics #science #siphon
-
What Limits a Siphon
Siphons are a bit mind-boggling for anyone who has internalized the idea that water always flows downhill. But gravity actually allows a siphon’s water to flow up and over an obstacle, provided certain conditions are met. Steve Mould digs into the details of those conditions in this video, where he searches for the maximum height a siphon can reach.
A quick note on terminology: Steve explains that the siphon breaks when water near the top starts “boiling.” Other sources may use the term “cavitating” for this sudden phase change. There’s not–to my knowledge–a generally-agreed-upon definition that clearly distinguishes between boiling and cavitation in this situation. Whichever term you use, the water in the siphon doesn’t care; either way, it’s experiencing a local pressure that’s so low that it switches from a liquid state (where it can resist tensile forces) to a gaseous one (where it cannot resist tension). (Video and image credit: S. Mould)
#cavitation #DIYFluids #fluidDynamics #physics #science #siphon
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Inside Cuttlefish Suction
Cuttlefish, like many cephalopods, catch prey with their tentacles. Suction cups along the tentacle help them hold on. In this video, researchers share preliminary studies of what goes on inside these suction cups as they’re detached. The low pressures inside the suction cup cause water to vaporize, temporarily. As seen for both the cuttlefish and a bio-inspired suction cup, small bubbles form inside the attached cup, coalesce into larger bubbles, and then get destroyed in the catastrophic leak that occurs once part of the suction cup detaches. (Video and image credit: B. Zhang et al.)
#biology #bubbleCollapse #cavitation #cuttlefish #flowVisualization #fluidDynamics #physics #science #suction
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Inside Cuttlefish Suction
Cuttlefish, like many cephalopods, catch prey with their tentacles. Suction cups along the tentacle help them hold on. In this video, researchers share preliminary studies of what goes on inside these suction cups as they’re detached. The low pressures inside the suction cup cause water to vaporize, temporarily. As seen for both the cuttlefish and a bio-inspired suction cup, small bubbles form inside the attached cup, coalesce into larger bubbles, and then get destroyed in the catastrophic leak that occurs once part of the suction cup detaches. (Video and image credit: B. Zhang et al.)
#biology #bubbleCollapse #cavitation #cuttlefish #flowVisualization #fluidDynamics #physics #science #suction
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Inside Cuttlefish Suction
Cuttlefish, like many cephalopods, catch prey with their tentacles. Suction cups along the tentacle help them hold on. In this video, researchers share preliminary studies of what goes on inside these suction cups as they’re detached. The low pressures inside the suction cup cause water to vaporize, temporarily. As seen for both the cuttlefish and a bio-inspired suction cup, small bubbles form inside the attached cup, coalesce into larger bubbles, and then get destroyed in the catastrophic leak that occurs once part of the suction cup detaches. (Video and image credit: B. Zhang et al.)
#biology #bubbleCollapse #cavitation #cuttlefish #flowVisualization #fluidDynamics #physics #science #suction
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Inside Cuttlefish Suction
Cuttlefish, like many cephalopods, catch prey with their tentacles. Suction cups along the tentacle help them hold on. In this video, researchers share preliminary studies of what goes on inside these suction cups as they’re detached. The low pressures inside the suction cup cause water to vaporize, temporarily. As seen for both the cuttlefish and a bio-inspired suction cup, small bubbles form inside the attached cup, coalesce into larger bubbles, and then get destroyed in the catastrophic leak that occurs once part of the suction cup detaches. (Video and image credit: B. Zhang et al.)
#biology #bubbleCollapse #cavitation #cuttlefish #flowVisualization #fluidDynamics #physics #science #suction
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Inside Cuttlefish Suction
Cuttlefish, like many cephalopods, catch prey with their tentacles. Suction cups along the tentacle help them hold on. In this video, researchers share preliminary studies of what goes on inside these suction cups as they’re detached. The low pressures inside the suction cup cause water to vaporize, temporarily. As seen for both the cuttlefish and a bio-inspired suction cup, small bubbles form inside the attached cup, coalesce into larger bubbles, and then get destroyed in the catastrophic leak that occurs once part of the suction cup detaches. (Video and image credit: B. Zhang et al.)
#biology #bubbleCollapse #cavitation #cuttlefish #flowVisualization #fluidDynamics #physics #science #suction
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I have always thought of #cavitation (the formation and rapid collapse of bubbles due to a liquid pressure drop), from an #engineering standpoint, as a problem that needs to be mitigated or avoided. But TIL that there are applications for which induced cavitation is useful... and it could be generated with that trusted sci-fi staple - #laser.
Link: https://www.sciencedirect.com/science/article/pii/S0030399223011052
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I have always thought of #cavitation (the formation and rapid collapse of bubbles due to a liquid pressure drop), from an #engineering standpoint, as a problem that needs to be mitigated or avoided. But TIL that there are applications for which induced cavitation is useful... and it could be generated with that trusted sci-fi staple - #laser.
Link: https://www.sciencedirect.com/science/article/pii/S0030399223011052
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I have always thought of #cavitation (the formation and rapid collapse of bubbles due to a liquid pressure drop), from an #engineering standpoint, as a problem that needs to be mitigated or avoided. But TIL that there are applications for which induced cavitation is useful... and it could be generated with that trusted sci-fi staple - #laser.
Link: https://www.sciencedirect.com/science/article/pii/S0030399223011052
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I have always thought of #cavitation (the formation and rapid collapse of bubbles due to a liquid pressure drop), from an #engineering standpoint, as a problem that needs to be mitigated or avoided. But TIL that there are applications for which induced cavitation is useful... and it could be generated with that trusted sci-fi staple - #laser.
Link: https://www.sciencedirect.com/science/article/pii/S0030399223011052
-
I have always thought of #cavitation (the formation and rapid collapse of bubbles due to a liquid pressure drop), from an #engineering standpoint, as a problem that needs to be mitigated or avoided. But TIL that there are applications for which induced cavitation is useful... and it could be generated with that trusted sci-fi staple - #laser.
Link: https://www.sciencedirect.com/science/article/pii/S0030399223011052
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Tag drei
Sven Schroeder, Leeds: Precipitation and dissolution of solids in water: Kinetics beyond classical nucleation theory
Llorenc Cremonesi, Mailand: Experimental multiparametric characterisation of aerosols through light scattering
Melanie Schnell, DESY+Kiel: A tiny droplet of acid:Hyperfine-resolved rotational spectroscopy reveals HCl dissociation upon microsolvation
mo: Taming the bubbles: #Cavitation dynamics revealed by #XFEL pulses
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Tag drei
Sven Schroeder, Leeds: Precipitation and dissolution of solids in water: Kinetics beyond classical nucleation theory
Llorenc Cremonesi, Mailand: Experimental multiparametric characterisation of aerosols through light scattering
Melanie Schnell, DESY+Kiel: A tiny droplet of acid:Hyperfine-resolved rotational spectroscopy reveals HCl dissociation upon microsolvation
mo: Taming the bubbles: #Cavitation dynamics revealed by #XFEL pulses
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Tag drei
Sven Schroeder, Leeds: Precipitation and dissolution of solids in water: Kinetics beyond classical nucleation theory
Llorenc Cremonesi, Mailand: Experimental multiparametric characterisation of aerosols through light scattering
Melanie Schnell, DESY+Kiel: A tiny droplet of acid:Hyperfine-resolved rotational spectroscopy reveals HCl dissociation upon microsolvation
mo: Taming the bubbles: #Cavitation dynamics revealed by #XFEL pulses
-
Tag drei
Sven Schroeder, Leeds: Precipitation and dissolution of solids in water: Kinetics beyond classical nucleation theory
Llorenc Cremonesi, Mailand: Experimental multiparametric characterisation of aerosols through light scattering
Melanie Schnell, DESY+Kiel: A tiny droplet of acid:Hyperfine-resolved rotational spectroscopy reveals HCl dissociation upon microsolvation
mo: Taming the bubbles: #Cavitation dynamics revealed by #XFEL pulses
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Cavitation Near Soft Surfaces
Collapsing cavitation bubbles are sometimes used to break up kidney stones, and they may find other uses in medicine as well. Here, researchers investigate the collapse of laser-triggered cavitation bubbles near tissue-mimicking hydrogel. The bubbles take on a very different form than they do near solid surfaces. Near hydrogel, the bubbles become mushroom-shaped. During their collapse, they release a rainy microjet that moves at nearly 2,000 meters per second! Even at 5 million frames per second, the jet is practically a blink-and-you-miss-it phenomenon. (Image and video credit: D. Preso et al.)
#2022gofm #cavitation #fluidDynamics #jets #physics #science
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Cavitation Near Soft Surfaces
Collapsing cavitation bubbles are sometimes used to break up kidney stones, and they may find other uses in medicine as well. Here, researchers investigate the collapse of laser-triggered cavitation bubbles near tissue-mimicking hydrogel. The bubbles take on a very different form than they do near solid surfaces. Near hydrogel, the bubbles become mushroom-shaped. During their collapse, they release a rainy microjet that moves at nearly 2,000 meters per second! Even at 5 million frames per second, the jet is practically a blink-and-you-miss-it phenomenon. (Image and video credit: D. Preso et al.)
#2022gofm #cavitation #fluidDynamics #jets #physics #science
-
Cavitation Near Soft Surfaces
Collapsing cavitation bubbles are sometimes used to break up kidney stones, and they may find other uses in medicine as well. Here, researchers investigate the collapse of laser-triggered cavitation bubbles near tissue-mimicking hydrogel. The bubbles take on a very different form than they do near solid surfaces. Near hydrogel, the bubbles become mushroom-shaped. During their collapse, they release a rainy microjet that moves at nearly 2,000 meters per second! Even at 5 million frames per second, the jet is practically a blink-and-you-miss-it phenomenon. (Image and video credit: D. Preso et al.)
#2022gofm #cavitation #fluidDynamics #jets #physics #science
-
Cavitation Near Soft Surfaces
Collapsing cavitation bubbles are sometimes used to break up kidney stones, and they may find other uses in medicine as well. Here, researchers investigate the collapse of laser-triggered cavitation bubbles near tissue-mimicking hydrogel. The bubbles take on a very different form than they do near solid surfaces. Near hydrogel, the bubbles become mushroom-shaped. During their collapse, they release a rainy microjet that moves at nearly 2,000 meters per second! Even at 5 million frames per second, the jet is practically a blink-and-you-miss-it phenomenon. (Image and video credit: D. Preso et al.)
#2022gofm #cavitation #fluidDynamics #jets #physics #science
-
Cavitation Near Soft Surfaces
Collapsing cavitation bubbles are sometimes used to break up kidney stones, and they may find other uses in medicine as well. Here, researchers investigate the collapse of laser-triggered cavitation bubbles near tissue-mimicking hydrogel. The bubbles take on a very different form than they do near solid surfaces. Near hydrogel, the bubbles become mushroom-shaped. During their collapse, they release a rainy microjet that moves at nearly 2,000 meters per second! Even at 5 million frames per second, the jet is practically a blink-and-you-miss-it phenomenon. (Image and video credit: D. Preso et al.)
#2022gofm #cavitation #fluidDynamics #jets #physics #science
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Dry Plants Warn Away Moths
Drought-stressed plants let out ultrasonic distress cries that moths use to avoid plants that can’t support their offspring. In ideal circumstances, a plant is constantly pulling water up from the soil, through its roots, and out its leaves through transpiration. This creates a strong negative pressure — varying from 2 to 17 atmospheres’ worth — inside the plant’s xylem. If there’s not enough water to keep the plant’s inner flow going, cavitation occurs — essentially a tiny vacuum bubble opens in the xylem. That cavitation isn’t silent; it creates a click at ultrasonic frequencies above human hearing. But just because we don’t hear it doesn’t mean that sound goes unheard.
In fact, recent research suggests that, not only do moths hear the plant’s cavitation cries, female moths will avoid laying eggs on a healthy plant that sounds like it’s cavitating. Evolutionarily, this makes sense. Hatchlings rely on their birth plant for food and habitat; if an adult moth picks a dying, drought-stressed plant, its offspring won’t survive. It pays to be sensitive to the plant’s signs of distress. (Image credit: Khalil; research credit: R. Seltzer et al.; via NYTimes)
#acoustics #biology #cavitation #fluidDynamics #moths #physics #plants #science #transpiration
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Dry Plants Warn Away Moths
Drought-stressed plants let out ultrasonic distress cries that moths use to avoid plants that can’t support their offspring. In ideal circumstances, a plant is constantly pulling water up from the soil, through its roots, and out its leaves through transpiration. This creates a strong negative pressure — varying from 2 to 17 atmospheres’ worth — inside the plant’s xylem. If there’s not enough water to keep the plant’s inner flow going, cavitation occurs — essentially a tiny vacuum bubble opens in the xylem. That cavitation isn’t silent; it creates a click at ultrasonic frequencies above human hearing. But just because we don’t hear it doesn’t mean that sound goes unheard.
In fact, recent research suggests that, not only do moths hear the plant’s cavitation cries, female moths will avoid laying eggs on a healthy plant that sounds like it’s cavitating. Evolutionarily, this makes sense. Hatchlings rely on their birth plant for food and habitat; if an adult moth picks a dying, drought-stressed plant, its offspring won’t survive. It pays to be sensitive to the plant’s signs of distress. (Image credit: Khalil; research credit: R. Seltzer et al.; via NYTimes)
#acoustics #biology #cavitation #fluidDynamics #moths #physics #plants #science #transpiration