Question

Two identical tubes have fluid flowing through them at the same speed. In one tube, the fluid is air, and in the other tube, the fluid is fresh water. Density(kg/m^3) Viscosity (Pa⋅s)Water at 20°C 998 1.002×10^−31Air around 20°C 1.23 1.808×10^−51In which tube is viscosity more important?a. the tube with waterb. the tube with airc. viscosity is equally important in each tubed. not enough information given to decide

Answer 1

b. the tube with air

Step-by-step explanation:

We know that Reynolds number given as

`Re=(V\rho d)/(\mu)`

V=Velocity of fluid in the tube

μ=Viscosity of fluid

d=Diameter of the fluid

ρ=Density of the fluid

Re's lower value means that viscosity is more significant for the fluid .Therefore tube with air is more important than the tube with water.

So the answer is --

b. the tube with air