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Questions tagged [viscosity]

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Momentum Diffusivity without Mass Diffusion in Liquids

I have been reading about the differences between momentum and mass diffusivity. I understand that mass diffusion occurs because of the "random walk" of individual molecules which over time ...
Nukesub's user avatar
  • 145
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0 answers
58 views

How to determine the slope for the gravity flow of highly viscous fluids (eg. gum)?

I am looking for a method to determine the slope of the pipe required to maintain a gravity flow for highly viscous fluid. The Hazen-Williams equation for gravity flow is applicable for liquids which ...
Wings's user avatar
  • 1
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1 answer
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Why is the kinematic viscosity unit m²/s when you only measure the time it passes a certain distance through a capillary rheometer?

Why did the scientists who designed the kin.viscosity measurement using a capillary rheometer setup decide to express the results in m2/s when all you measure is the time: the less viscous (faster ...
Adrian G.'s user avatar
2 votes
1 answer
230 views

How to raise viscosity of water

I need to measure a machine for a liquid of which I know the viscosity (89 Kinetic Viscosity) but I don't have the liquid at hand. Is there a clever way of increasing viscosity of water to 89?
John Snow's user avatar
  • 137
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Is the net viscous work done at a stationary wall equal to zero?

From the following site: Ref:https://www.me.psu.edu/cimbala/learning/fluid/CV_Energy/home.htm I read that the the net work done by viscous force at a stationary wall is zero. I understand that the ...
GRANZER's user avatar
  • 347