July 2017
Intermediate to advanced
816 pages
22h 16m
English
book
Fluid Mechanics for Chemical Engineers: with Microfluidics, CFD, and COMSOL Multiphysics 5
by James O. Wilkes
Content preview from Fluid Mechanics for Chemical Engineers: with Microfluidics, CFD, and COMSOL Multiphysics 5
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Chapter 8. Boundary-Layer and Other Nearly Unidirectional Flows
8.1 Introduction
ALTHOUGH the Navier-Stokes equations apply to the flow of a Newtonian fluid, they are—in general—very difficult to solve exactly. There is also the problem that an apparently correct solution may be physically unrealistic for high Reynolds numbers, because of turbulence or other instabilities.
Two particular types of simplifying approximations may be made, depending on the Reynolds number (the ratio of inertial to viscous effects), in order to make the situation more tractable:
1. Omit the inertial terms, as was done in the examples of Chapter 6. The resulting equations are typically appropriate for the flow near a fixed boundary, where viscous action is particularly ...
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