# Questions tagged [viscosity]

The viscosity of a fluid is a measure of its resistance to flow, or be deformed, stirred, and changed shape.

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### Navier-Stokes equation viscosity term

I cannot understand how the term μ$\nabla^2(\vec u)$ is derived. Can anyone help?
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### Inaccurate flow rate measurements of an engine diesel fuel due to change of its viscosity

I am measuring the volumetric flow rate of a diesel fuel using "Turbines" flow meter, both in the supply and return fuel lines of an industrial diesel engine (Caterpillar 3512B – coupled ...
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### Buoyancy versus viscosity

A common problem in casting is removing the air bubbles that might might be in the mold material, like plaster or resin. This is typically done by degassing--putting the mold material under vacuum to ...
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### Dual-medium Plateau-Rayleigh Instability

(This is my first question here so I would really appreciate your guidance on how to use SO better!) I’ve been working on the Plateau-Rayleigh instability for some time and I was considering the ...
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### Is there such a thing as viscous vapor?

I'd like to simulate a scenario where a character suddenly encounters very high air resistance due to volatile vapors that spread and stick around. Is it possible for some type of gas to be viscous in ...
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### Turbulent boundary layer: viscous sublayer definition

I have seen different definitions of the viscous sublayer within a turbulent boundary layer, through my searches. Ones say that the viscous sublayer area is for $y \leq 10 * \delta_v$ where $\delta_v$...
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### Calculation of velocity of water flowing along inclined plane by applying Navier-Stokes theorem

Assume that water flows along a inlined plane through a circular irrigation waterway. The inclined plane has its bottom length $B=50 m$, and has height $H=10 m$. So the angle of inclination $\theta$ ...
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### Why can't water flow fast when the impact speeds up? (the incompressibility)

I'm a high school student studying physics in Korea! Please understand my poor English skills. In the text below, the liquid is said to be destructive and incompressible. And he says, "I the ...
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### What was the need for defining kinematic viscosity?

How is kinematic viscosity physically different than dynamic viscosity? What was the need for defining a new quantity ie kinematic viscosity though one can get one from the other? Do try to give a ...
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### Stoke law determend the viscosity of liquid

In an experiment to determine the viscosity by the Stoke method. When we throw the ball into the liquid it will reach a certain mark and start recording the time. This mark what determines its ...
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### Viscosity in fluids is like kinetic friction between solids. But what is the fluid-equivalent of static friction?

Viscous stress is proportional to $\frac{du}{dy}$, so they only arise from relative motion between different layers of fluid. That makes it somewhat similar to kinetic friction, which requires ...
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