Ask Question
15 March, 14:01

The Reynolds number is a dimensionless group defined for a fluid flowing in a pipe as Re Durho/μ whereD is pipe diameter, u is fluid velocity, rho is fluid density, and μ is fluid viscosity. When the value of the Reynolds number is less than about 2100, the flow is laminar-that is, the fluid flows in smooth streamlines. For Reynolds numbers above 2100, the flow is turbulent, characterized by a great deal of agitation. Liquid methyl ethyl ketone (MEK) flows through a pipe with an inner diameter of 2.067 inches at an average velocity of 0.48 ft/s. At the fluid temperature of 20°C the density of liquid MEK is 0.805 g/cm3 and the viscosity is 0.43 centipoise [1 cP 1:00 103 kg / m s]. Without using a calculator, determine whether the flow is laminar or turbulent. Show your calculations.

+3
Answers (1)
  1. 15 March, 17:24
    0
    the flow is turbulent

    Explanation:

    The Reynolds number is given by

    Re=ρVD/μ

    where

    V=fluid speed=0.48ft/s=0.146m/s

    D=diameter=2.067in=0.0525m

    ρ=density=0.805g/cm^3=805Kg/m^3

    μ=0.43Cp=4.3x10^-4Pas

    Re = (805) (0.146) (0.0525) / 4.3x10^-4=14349.59

    Re>2100 the flow is turbulent

    Note: if you do not want to use a calculator you can use the graphs to calculate the Reynolds number according to their properties
Know the Answer?
Not Sure About the Answer?
Find an answer to your question ✅ “The Reynolds number is a dimensionless group defined for a fluid flowing in a pipe as Re Durho/μ whereD is pipe diameter, u is fluid ...” in 📘 Engineering if you're in doubt about the correctness of the answers or there's no answer, then try to use the smart search and find answers to the similar questions.
Search for Other Answers