Viscosity Definition and 232 Threads

Homework Statement A shearing force of 100 dynes is applied to the side of a rectangular plate of 5 x 10 cm dimensions placed on top of a 0.5 mm high column of Newtonian fluid that is initially at rest. As a result of the shearing force, the plate moves at a speed of 11.2 cm/sec. What is the...

How good derivations are there for the viscosity term \nu \nabla^2 u_i, that contributes to the acceleration of fluid, in Navier-Stokes equations? I can see that this term is intuitively reasonable. If I wanted to approximate the velocity of the fluid in an environment of some point...

Could anyone explain me and comment the Newtonian viscosity equaton?

Homework Statement Two identical vertical cylindrical vessels of cross section α are joined at thir bases by a narrow horizontal tube of length l and internal radius r.A liquid of density d and co-efficient of viscosity λ is flowing slowly from one vessel to the other through the...

What is shear flow? Hat this flow viscosity? .... Thank you

I need to do some head loss calculations for pumping diesel fuel or No. 2 fuel oil from a storage tank to an emergency generator. I see in many places that diesel fuel is specified to have kinematic viscosities of 1.3 to 4.1 cSt at 40C. However, under worst case scenarios, this fuel is likely...

Homework Statement Hi guys, I need to find the flow of water at temperature of 350K. I had to do this, but for air in the same problem...but I can't find an equation to account for the viscosity change, due to temperature rise. My book lists it at 86.0 x 10^-5 Pa*s @ temp 300K...

What does it mean by momentum transfer is not a vector (3 components) but rather a tensor (9 components)?

Could anyone tell me what the viscosity and density of glycerol are at 294K? This may be the wrong forum but technically it is physics cousework even though I am asking for chemistry I got the following value for the viscosity 1.27Pa.sec. correct?

Viscosity Woes :( Hi, I'm conducting a Physics Investigation where I'm changing the temperature of Motor Oil and seeing how the change in temperature affects viscosity of the oil. I am measuring the terminal velocity of the sphere in the oil (V). I'm Using Stokes' Law Equation: F=6piRNV...

What determines a substance's viscosity? Is it a molecular pattern or something of the sort?

Hi, I have a question about the viscosity of fluids: If I know the viscosity of one fluid, say 1 Pa.s, and I add a portion of water (say for example 1 part water to 9 parts fluid), viscosity 0.89 × 10^-3 Pa.s, what is the viscosity of the new mixture? I have done an experiment for school where...

Hi. This is a two part question, I'm pretty sure about the first bit but in the second part my answer seems a bit weird. Not the order of magnitude I was expecting. Just wondering can anyone confirm or deny my suspician? Point me in more correct direction if I am indeed wrong. This isn't for...

Does anybody know why viscosity changes with temperature? I'm expected to do a short explanation or suggestion for my homework of why this happens but to be honest I'm not sure. :confused: The only reason I can think of is higher temperature means more energy therefore less internal...

I'm trying to work out the viscosity of oil at various temperatures. I've got all my results, but when I try to work out the viscosity I get some really far out answers. What region would you expect the viscosity of oil room temperature to be? I get this result for viscosity of oil: -1330245.26...

Say the reaction is like: A + B <=> C + D and i know the individual concentrations of the reactants and products. Is there any equation to find the viscosity of the system? Any softwares to simulate??

Is there any chemical reaction which can alter/ change the viscosity of the system ?

I have been reading a number of aerodynamic texts, and it seems that everything in a fluid (gas) is transmitted by molecular collisions. Pressure is a result of molecules colliding with each other and the walls of a container Viscosity is caused by collisions between molecules in layers...

I did an experiment to calculate viscosities of various ethanol concentrations, 0% to 100% the graph is parabolic, and therefor the highest viscosity is 50% concentration i don't understand why, since seperately water and ethanol are closer to 1 centipoise well ethanol more and water less...

hi all just doing some questions and come along these two which have me stumped. There multiple choice questions but id rather know the working out to them as i have exams in a couple of weeks. thanks. 1. The mass of a hot-air balloon and its fully loaded basket is 500kg excluding the air in...

hello, i need to know about the viscosity of liquids i.e. the science behind it. most websites i looked into did not help at all! also, i am doing an experiment based on the viscosity of liquids and have five liquids to choose from : honey, olive oil, ethanol, water, and corn syrup. please...

Viscosity of a solution of NACl Hi! Who could give me the correct value of NaCl's viscosity (in solution)? Thanks! Regards, tyutyu

Viscosity and Upthrust... Viscosity and upthrust are both forces which occur in liquids, and must both rely on electrostatic effects. So what is there difference between them? What causes these 2 distinctly different effects? Thanks in advance. :smile:

For AS Level physics I had to do some coursework on the viscosity of Honey. I found out that as the temperature of the honey increases, its viscosity decreases. I drew the conclusion that, when a substance is heated, its molecules move farther apart and faster, so therefore, if the molecules...

Why is the flow behaviour or viscosity important in the case of polymer? This question is given when we had lecture about flow behaviour, viscosity, and rheology. Thanks a lot!

Hi, Im doing an experiment to determine the viscosity of glycerol this is my collected data: Data: Sphere radius: 0.8 cm Sphere mass: 16.3 g Sphere voume: 2.14 cm -³ Sphere density: 7.62 g cm -³ Glycerol density 1.26 g cm -³ Sphere Terminal Velocity: 23 cm/s Light Gate...

Does anyone know equations that can be used to equate fluid viscosity using the terminal velocity of a mass falling down a tube of that liquid? Thanks

Hello again. My friend is also doing his science fair project and he has trouble thinking of ways that we can apply "relationship of heat capacity and viscosity" to everyday life. His experiment is basically just to examine how much the temperature of fluids with different viscosities are...

Hi, I am Tsering and am studying in the Mahindra UWC of India. I am doing a physics extended essay on How the cross section area of an object(cylinder) will affect the rate of slowing down of the object when dropped from a certain height into a fluid (water in my case). I will try to find the...

The human heart is able to power viscous blood through ~100,000 miles of narrow capillaries in less than a minute. Do the capillaries themselves provide a substantial fraction of the needed impulse?

A tank of large area is filled with water to a depth of 0.6m. A hole of 6m^2 cross section in the bottom allows water to drain out in a continuous stream. What is the rate at which water flows out the tank in m^3/s? This is how I figure the problem should be solved: Q=...

Did some research on the net and found most information saying it is caused by viscosity and friction, I can understand that in stuff like water but I can't really see how that would hold true for air, could somebody explain it to me or point me to a definitive explanation of the effect?