#rheology — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #rheology, aggregated by home.social.
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6 months goes quickly - time for #Oil #service on #VW #GolfGTI with #EA888 engine
Completed with 0 major hassles - didn't spill any major amount of used oil in yard this time round, and #BGS funnel attachment (72214) is a gamechanger, fits directly in place of oil filler cap rather than having to hold funnel with thin end over opening in one hand and oil container in the other.
Was even able to pour oil in near perfect stream without splashing like my dad used to in 1970s/80s - to be fair he did have a bit more practice, not only did cars need 3 month oil changes back then, he also worked for #Castrol in research labs testing #rheology so was dealing with the stuff every day 😁
Bonus #photobomb for #Caturday from yard #cat in first photo..
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6 months goes quickly - time for #Oil #service on #VW #GolfGTI with #EA888 engine
Completed with 0 major hassles - didn't spill any major amount of used oil in yard this time round, and #BGS funnel attachment (72214) is a gamechanger, fits directly in place of oil filler cap rather than having to hold funnel with thin end over opening in one hand and oil container in the other.
Was even able to pour oil in near perfect stream without splashing like my dad used to in 1970s/80s - to be fair he did have a bit more practice, not only did cars need 3 month oil changes back then, he also worked for #Castrol in research labs testing #rheology so was dealing with the stuff every day 😁
Bonus #photobomb for #Caturday from yard #cat in first photo..
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6 months goes quickly - time for #Oil #service on #VW #GolfGTI with #EA888 engine
Completed with 0 major hassles - didn't spill any major amount of used oil in yard this time round, and #BGS funnel attachment (72214) is a gamechanger, fits directly in place of oil filler cap rather than having to hold funnel with thin end over opening in one hand and oil container in the other.
Was even able to pour oil in near perfect stream without splashing like my dad used to in 1970s/80s - to be fair he did have a bit more practice, not only did cars need 3 month oil changes back then, he also worked for #Castrol in research labs testing #rheology so was dealing with the stuff every day 😁
Bonus #photobomb for #Caturday from yard #cat in first photo..
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6 months goes quickly - time for #Oil #service on #VW #GolfGTI with #EA888 engine
Completed with 0 major hassles - didn't spill any major amount of used oil in yard this time round, and #BGS funnel attachment (72214) is a gamechanger, fits directly in place of oil filler cap rather than having to hold funnel with thin end over opening in one hand and oil container in the other.
Was even able to pour oil in near perfect stream without splashing like my dad used to in 1970s/80s - to be fair he did have a bit more practice, not only did cars need 3 month oil changes back then, he also worked for #Castrol in research labs testing #rheology so was dealing with the stuff every day 😁
Bonus #photobomb for #Caturday from yard #cat in first photo..
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6 months goes quickly - time for #Oil #service on #VW #GolfGTI with #EA888 engine
Completed with 0 major hassles - didn't spill any major amount of used oil in yard this time round, and #BGS funnel attachment (72214) is a gamechanger, fits directly in place of oil filler cap rather than having to hold funnel with thin end over opening in one hand and oil container in the other.
Was even able to pour oil in near perfect stream without splashing like my dad used to in 1970s/80s - to be fair he did have a bit more practice, not only did cars need 3 month oil changes back then, he also worked for #Castrol in research labs testing #rheology so was dealing with the stuff every day 😁
Bonus #photobomb for #Caturday from yard #cat in first photo..
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A cornstarch-water droplet can behave like a liquid and a solid at the same time, depending on how it is stressed.
High-speed imaging reveals how these “oobleck” drops reshape on impact, highlighting the surprising physics of shear-thickening fluids.
🔗 https://www.nature.com/articles/d41586-026-01109-3
#FluidDynamics #SoftMatter #Rheology #ComplexFluids #physics
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Rheology is the branch of physics and materials science that studies the deformation and flow of matter, primarily in liquids, soft solids, and complex fluids that do not follow the simple laws of viscosity or elasticity. Its primary goal is to understand and predict how materials respond to applied forces, stresses, or strains over time.
#Rheology #Physics #MaterialScience #Chemistry #sflorg
https://www.sflorg.com/2026/02/cat02152601.html -
Researchers have determined that the severity of sickle cell disease (#SCD ) symptoms is driven by the specific physical behavior of a small sub-population of rigid red #blood cells, rather than the average "thickness" or viscosity of the patient's blood as previously believed.
#Biomedical #BiomedicalEngineering #Biophysics #Hematology #Rheology #sflorg
https://www.sflorg.com/2026/02/bmed02112601.html -
Watch Hagfish Slime Unfurl
The eel-like hagfish has one of the best defenses in the ocean. When threatened, it releases a slime that clogs the gills of its predator but allows the hagfish itself to slough off the slime and escape. The hagfish slime’s secret weapon is long protein threads, which are initially rolled into bundles called skeins. Seen above, these skeins resemble the yarn skeins knitters and crocheters buy, but a hagfish’s skeins are only as big as the width of a human hair.
When water flows by quickly enough, the thread in a skein begins to unwind and stretch out. With enough threads unwound, the slime gets stretchy and viscous. Researchers found that it takes relatively little flow to begin this unwinding because the adhesion between threads and the surrounding fluid is higher than the thread-to-thread sticking power. (Research and image credit: M. Hossain et al., video)
#biology #fluidDynamics #hagfish #physics #rheology #science #viscoelasticity
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Predicting Yield
We’ve all experienced the frustration of ketchup refusing to leave the bottle or toothpaste that shoots out suddenly. These materials are yield stress fluids, which transition from solid-like behavior to liquid flow once the right amount of force is applied. A new study suggests that — despite their wide range of characteristics — these fluids share a universal relation: their yield transition (when they start to flow) depends on their characteristics when at rest. Interestingly, this relationship seems to hold not only for polymeric fluids like the one in the study but also nonpolymeric ones. (Image credit: haideyy; research credit: D. Keane et al.; via APS Physics)
#fluidDynamics #physics #rheology #science #yieldStressFluid
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Interesting : In a #fibrin #gel, inseritng 5% inclusions lead to a 10× increase of #shearModulus and switch from softening to stiffening behaviour. #Collagen gels also show some of these features.
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Vitrimers are basically polymers with commitment issues—forever linked, always rearranging. Entropy’s favorite soap opera. 🧪🧠 #CANs #rheology #glitchpolymer
https://pubs.aip.org/aip/jcp/article-abstract/162/17/174904/3345655/A-simulation-based-comparative-study-on-the -
Weak Asthenosphere Beneath The Eurasian Interior Inferred From Aral Sea Desiccation
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https://doi.org/10.1038/s41561-025-01664-w <-- shared paper
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#GIS #spatial #mapping #remotesensing #earthobservation #inSAR #AralSea #rebound #isostaticrebound #asthenosphere #geology #structuralgeology #mantle #crust #weight #rheology #spatialanalysis #spatiotemporal #continent #desiccation #loss #drying #water #hydrology #elastic #viscoelastic #model #modeling #uplift #lithosphere #humanimpacts #tectonic -
Weak Asthenosphere Beneath The Eurasian Interior Inferred From Aral Sea Desiccation
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https://doi.org/10.1038/s41561-025-01664-w <-- shared paper
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#GIS #spatial #mapping #remotesensing #earthobservation #inSAR #AralSea #rebound #isostaticrebound #asthenosphere #geology #structuralgeology #mantle #crust #weight #rheology #spatialanalysis #spatiotemporal #continent #desiccation #loss #drying #water #hydrology #elastic #viscoelastic #model #modeling #uplift #lithosphere #humanimpacts #tectonic -
Weak Asthenosphere Beneath The Eurasian Interior Inferred From Aral Sea Desiccation
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https://doi.org/10.1038/s41561-025-01664-w <-- shared paper
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#GIS #spatial #mapping #remotesensing #earthobservation #inSAR #AralSea #rebound #isostaticrebound #asthenosphere #geology #structuralgeology #mantle #crust #weight #rheology #spatialanalysis #spatiotemporal #continent #desiccation #loss #drying #water #hydrology #elastic #viscoelastic #model #modeling #uplift #lithosphere #humanimpacts #tectonic -
Weak Asthenosphere Beneath The Eurasian Interior Inferred From Aral Sea Desiccation
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https://doi.org/10.1038/s41561-025-01664-w <-- shared paper
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#GIS #spatial #mapping #remotesensing #earthobservation #inSAR #AralSea #rebound #isostaticrebound #asthenosphere #geology #structuralgeology #mantle #crust #weight #rheology #spatialanalysis #spatiotemporal #continent #desiccation #loss #drying #water #hydrology #elastic #viscoelastic #model #modeling #uplift #lithosphere #humanimpacts #tectonic -
Weak Asthenosphere Beneath The Eurasian Interior Inferred From Aral Sea Desiccation
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https://doi.org/10.1038/s41561-025-01664-w <-- shared paper
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#GIS #spatial #mapping #remotesensing #earthobservation #inSAR #AralSea #rebound #isostaticrebound #asthenosphere #geology #structuralgeology #mantle #crust #weight #rheology #spatialanalysis #spatiotemporal #continent #desiccation #loss #drying #water #hydrology #elastic #viscoelastic #model #modeling #uplift #lithosphere #humanimpacts #tectonic -
Measuring Mucus by Dragging Dead Fish
A fish‘s mucus layer is critical; it protects from pathogens, reduces drag in the water, and, in some cases, protects against predators. But little is known about how mucus could affect terrestrial locomotion in species like the northern snakehead, which can breathe out of the water and move across land. So researchers explored the snakehead’s mucus layer by measuring the force required to drag them (and two other non-terrestrial species) across different surfaces.
The team tested the same, freshly euthanized fish twice: once with its mucus layer intact and again once the mucus was washed off. Unsurprisingly, the fish’s friction was much lower with its mucus. But they also found that the snakehead was slipperier than either the scaled carp or the scale-free catfish. The biologists suggest that the snakehead could have evolved a slipperier mucus to help it move more easily on land, thereby extending the distance it can cover.
As a fluid dynamicist, I think fish mucus sounds like a great new playground for the rheologists among us. (Image and research credit: F. Lopez-Chilel and N. Bressman; via PopSci)
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Baseball’s Mysterious Rubbing Mud
Since 1938, every ball in Major League Baseball has been covered in a special “rubbing mud” harvested from a secret location in New Jersey. Although the league has tried in the past to replace the mud with an alternative, it’s never stuck. Researchers wondered just what makes this mud so special, so naturally, they brought some to the lab to study its composition and rheology.
The mud consists of clay, silt, and sand with a smattering of organic particles. The make-up was pretty typical of river mud in the region, although researchers noted a drop-off in large particle sizes that probably indicates some sieving. In terms of rheology, the mud is shear-thinning, meaning it behaves a bit like lotion. It sits solidly in the hand until it’s deformed, at which point it smoothly coats the surface as a liquid would.
So how does the mud change the baseballs? The researchers found three effects. First, the mud’s shear-thinning allowed it to fill in any pores or imperfections in the ball’s surface, creating a more uniform surface. Second, the dried mud’s residue doubled the ball’s contact adhesion. And, finally, the occasional large sand particles glued to the ball by the dried mud added friction. As the researchers put it, the rubbing mud “spreads like skin cream and grips like sandpaper.” (Image credit: L. Juarez; research credit: S. Pradeep et al.; via EOS)
#baseball #fluidDynamics #physics #rheology #science #shearThinning #sports
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I'll take the opportunity to open a small parenthesis on what #rheology aka “the science of the flow”, is: the term, which can be used both for fluids and (some classes of) deformable solids describes the relationship between stress and strain in a continumm.
To wit, for something to flow (or deform), there must be a force applied. The relation between this force and how much (and how quickly) the continuum deforms is what rheology is about.
Rheology deals with two main classes of behavior: #plasticity and #viscosity.
Plastic behavior refers to (permanent) deformations whose magnitude depends on the applied force: smaller forces result in smaller deformations, larger forces in larger deformations. This is typical of solids.
Viscous behavior refers to deformations whose rate depends on the applied force: in this sense deformations can be “infinite” (the distance between two given points can grow arbitrarily), and as long as the force is applied the deformation will grow. #Viscosity determines how strongly the continuum (typically a fluid) resits to the deformation, and thus how quickly (or slowly) it deforms.
And of course you can have hybrid behaviors (viscoplastic, viscoelastic, viscoplastoelastic).
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Note that I'm not criticizing the work of the scientists that work on this: it's not a methodological issue, it's just that there are challenges that make the problem almost intractable, and anything that gets us closer is in fact very welcome.
There are also ongoing efforts to take measurements in situ, which presents nontrivial challenges because, in case you missed it, lava is HOT. And this not only puts the scientists at risk, but also tends to have a negative effect on the instrumentation: dipping a viscosimeter in lava requires, shall we say, a well-designed viscosimeter, unless your intent is to melt the tool.
Still, it has been done, see for example https://doi.org/10.1016/j.epsl.2018.04.028But wait, there's more! There isn't just the issue of not knowing what the lava viscosity is. We don't even know what the lava #rheology is.
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Cooking Perfect Cacio e Pepe
In cooking, sometimes the simplest recipes are the toughest to master. Cacio e pepe — a classic three-ingredient Italian pasta — is an excellent example. Made properly, the sauce of cheese and black pepper combines with starchy water to coat the pasta in a uniform, cheesy sauce. Or, if you’re me, you wind up with a pasta sauce flecked with stringy clumps of melted cheese. Fortunately for those of us who have yet to master this one, a new research paper has us covered with tips to make the perfect cacio e pepe.
The key to that elusive silky sauce, they found, is the starch – water – cheese combination. Your water needs just the right amount of starch — they found that between 1 – 4% starch by (cheese) mass worked. If the starch concentration is too low (which can easily happen in pasta water), you’ll get the clumpy cheese mess that so frequently happens in my kitchen. Temperature is also critical; if the water is too hot when it’s added, then it can destabilize the sauce. Check out the pre-print’s Section V for the scientific, supposedly foolproof, recipe. I know I’ll be trying it! (Image credit: O. Kadaksoo; research credit: G. Bartolucci et al. pre-print; via APS News)
#cooking #emulsion #fluidDynamics #phaseSeparation #physics #rheology #science #softMatter
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Our #preprint where we derive an #activeGel #model with entropic elasticity of the #microstructure from the thermodynamic constraints on the dynamics of #myosin molecular motors is now updated!
Hopefully more readable, and with the example of a #cyst like contractile sphere.
#cytoskeleton #rheology #activeMatter #softMatter #actomyosin
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Our #preprint where we derive an #activeGel #model with entropic elasticity of the #microstructure from the thermodynamic constraints on the dynamics of #myosin molecular motors is now updated!
Hopefully more readable, and with the example of a #cyst like contractile sphere.
#cytoskeleton #rheology #activeMatter #softMatter #actomyosin
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Our #preprint where we derive an #activeGel #model with entropic elasticity of the #microstructure from the thermodynamic constraints on the dynamics of #myosin molecular motors is now updated!
Hopefully more readable, and with the example of a #cyst like contractile sphere.
#cytoskeleton #rheology #activeMatter #softMatter #actomyosin
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Our #preprint where we derive an #activeGel #model with entropic elasticity of the #microstructure from the thermodynamic constraints on the dynamics of #myosin molecular motors is now updated!
Hopefully more readable, and with the example of a #cyst like contractile sphere.
#cytoskeleton #rheology #activeMatter #softMatter #actomyosin
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Our #preprint where we derive an #activeGel #model with entropic elasticity of the #microstructure from the thermodynamic constraints on the dynamics of #myosin molecular motors is now updated!
Hopefully more readable, and with the example of a #cyst like contractile sphere.
#cytoskeleton #rheology #activeMatter #softMatter #actomyosin
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Alpine Catchments’ Hazard Related To Subaerial Sediment Gravity Flows Estimated On Dominant Lithology And Outcropping Bedrock Percentage
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https://doi.org/10.3390/geohazards5030034 <-- shared paper
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#GIS #spatial #mapping #debrisflow #gravityflow #hyperconcentrated #flow #alluvialfan #rainfall #threshold #ItalianAlps #italy #engineeringgeology #massmovement #landslides #water #hydrology #rheology #soil #model #modeling #morphology #spatialanalysis #spatiotemporal #sedimentgravityflow #risk #hazard #alpine #mountain #catchments #elevation #slope #steepness #trigger #lithology #geomechanics #geomorphology #geomorphometry #morphology #sediment #SusaValley #history #geology #bedrock -
Alpine Catchments’ Hazard Related To Subaerial Sediment Gravity Flows Estimated On Dominant Lithology And Outcropping Bedrock Percentage
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https://doi.org/10.3390/geohazards5030034 <-- shared paper
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#GIS #spatial #mapping #debrisflow #gravityflow #hyperconcentrated #flow #alluvialfan #rainfall #threshold #ItalianAlps #italy #engineeringgeology #massmovement #landslides #water #hydrology #rheology #soil #model #modeling #morphology #spatialanalysis #spatiotemporal #sedimentgravityflow #risk #hazard #alpine #mountain #catchments #elevation #slope #steepness #trigger #lithology #geomechanics #geomorphology #geomorphometry #morphology #sediment #SusaValley #history #geology #bedrock -
Alpine Catchments’ Hazard Related To Subaerial Sediment Gravity Flows Estimated On Dominant Lithology And Outcropping Bedrock Percentage
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https://doi.org/10.3390/geohazards5030034 <-- shared paper
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#GIS #spatial #mapping #debrisflow #gravityflow #hyperconcentrated #flow #alluvialfan #rainfall #threshold #ItalianAlps #italy #engineeringgeology #massmovement #landslides #water #hydrology #rheology #soil #model #modeling #morphology #spatialanalysis #spatiotemporal #sedimentgravityflow #risk #hazard #alpine #mountain #catchments #elevation #slope #steepness #trigger #lithology #geomechanics #geomorphology #geomorphometry #morphology #sediment #SusaValley #history #geology #bedrock -
Alpine Catchments’ Hazard Related To Subaerial Sediment Gravity Flows Estimated On Dominant Lithology And Outcropping Bedrock Percentage
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https://doi.org/10.3390/geohazards5030034 <-- shared paper
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#GIS #spatial #mapping #debrisflow #gravityflow #hyperconcentrated #flow #alluvialfan #rainfall #threshold #ItalianAlps #italy #engineeringgeology #massmovement #landslides #water #hydrology #rheology #soil #model #modeling #morphology #spatialanalysis #spatiotemporal #sedimentgravityflow #risk #hazard #alpine #mountain #catchments #elevation #slope #steepness #trigger #lithology #geomechanics #geomorphology #geomorphometry #morphology #sediment #SusaValley #history #geology #bedrock -
Alpine Catchments’ Hazard Related To Subaerial Sediment Gravity Flows Estimated On Dominant Lithology And Outcropping Bedrock Percentage
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https://doi.org/10.3390/geohazards5030034 <-- shared paper
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#GIS #spatial #mapping #debrisflow #gravityflow #hyperconcentrated #flow #alluvialfan #rainfall #threshold #ItalianAlps #italy #engineeringgeology #massmovement #landslides #water #hydrology #rheology #soil #model #modeling #morphology #spatialanalysis #spatiotemporal #sedimentgravityflow #risk #hazard #alpine #mountain #catchments #elevation #slope #steepness #trigger #lithology #geomechanics #geomorphology #geomorphometry #morphology #sediment #SusaValley #history #geology #bedrock -
A new #preprint where we derive an #activeGel #model with entropic elasticity of the #microstructure and give interpretations of the thermodynamic constraints on the dynamics of #myosin molecular motors.
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Very good #AERC Annual European #Rheology #Conference this week in #Leeds. That was my first time in this series since 2007! I met again with many people I hadn't seen since.
Not incredibly much of #bio-related work, but a great range of all sorts of soft and flowing matter talks, and a great poster session with a lot of space and time allowed.
Consider joining the next one in #Lyon 🇫🇷 !
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The shearing of fluids – meaning the sliding of fluid layers over each other under shear forces – is an important concept in #nature and in #rheology, the science that studies the flow behavior of matter, including liquids and soft solids.
#Physics #sflorg
https://www.sflorg.com/2024/04/phy04042401.html -
📷 Beautiful capture of network-like patterns known as "force chains"
This is Figure 2 of https://doi.org/10.1093/gji/ggae009 by D.W. Vasco and co-authors
Wikepedia article on force chains: https://en.wikipedia.org/wiki/Force_chain
#physics #geomechanics #hydrogeophysics #mechanics #theory #modelling #elasticity #anelasticity #transient #deformation #creep #deformation #force #rock #mineral #rheology #seismic #california #science #research #ras #gji #photography #experiment
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A new astronomy cover for the Science Advances Journal, starring Enceladus, the icy moon of Saturn.
Feature article by Wanying Kang (MIT Earth, Atmospheric and Planetary Science Department) on the ocean stress on icy moon ice shells, and its impact on the habitability of these satellites.
https://science.org/toc/sciadv/10/4
#enceladus #saturn #ice #ocean #moon #europa #rheology #astronomy #astrophysics #astrodon #space #science #research #planet #planets #cover #art #covers #coverart #photography
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Annual European Rheology Conference 2024 takes place at the University of #Leeds, UK from 9th-12th April 2024.
*deadline 15/12 for abstracts*
#Colloids & Glasses
#Polymeric Fluids
#Emulsions, #Foams and #Interfacial #Rheology
#Microrheology #microfluidics
#rheometry
#Suspensions #Granular Materials
#Food Rheology
#NonNewtonian #Fluids #Instabilities
#additiveManufacturing
#BioRheology #ActiveMatter
#GeoRheology
#SoftSolids #Viscoplasticity -
Rheology LIVE 2021 Day1 「文明生活與人類學」Kiseki（キセキ）～Pokémon Medley https://www.wacoca.com/videos/1836068/voice-actress/
#acappella #Acappellacover #Acappellamusic #anime #Butter-Fly #DAY1 #GReeeeN #jpop #LIVE #Medley #pokemon #Rheology #taiwan #Vlog #voiceactress #キセキ #めざせポケモンマスター #和田光司 #声優 #女性声優 #寶可夢 #文明生活與人類學KisekiキセキPokémon #日文歌 #日本 #松本梨香 #演唱會 #神奇寶貝 #翻唱 #臺灣 #阿卡貝拉
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Oxford scientists crack case of why ketchup splatters from near-empty bottle - Enlarge / Getting those few last dollops of ketchup out of the bottle c... - https://arstechnica.com/?p=1899879 #mathematicalmodeling #non-newtonianfluids #criticalthreshold #phasetransitions #appliedphysics #fluiddynamics #foodscience #condiments #rheology #science #physics
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An #introduction. Am passionate about #polymer and #colloid #science. Our #research takes a #chemeng approach to #GreenRecovery of polymer colloids. We work closely with a variety of #industry in areas such as #personalcareproducts , #coatings, #adhesives, #rheology modifiers. Love teaching the #nextgeneration of #sustainable scientists at #WarwickUni. Also passionate about #diversity #equality and #lgbtq communities.