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diameter of the largest particle whose behaviour is governed by Stokes’ law for this solid and liquid?

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter5: Analysis Of Convection Heat Transfer

Section: Chapter Questions

Problem 5.9P: When a sphere falls freely through a homogeneous fluid, it reaches a terminal velocity at which the...

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Question

A particle of diameter 10 microns and of density 1600 kg/m³ is settling in a liquid of density 1000 kg/m³ and of viscosity 0.001 Pa-s. If Stokes law applies for particle Reynold’s number up to 0.2, what is the diameter of the largest particle whose behaviour is governed by Stokes’ law for this solid and liquid?
A. 10 microns
B. 85 microns
C. 380 microns
D. 540 microns

Ans: B. 85 microns

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