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Unformatted text preview: shorter than the de- | v v 332 | e-Text Main Menu | Textbook Table of Contents | Study Guide 6.3 Semiempirical Turbulent Shear Correlations 333 velopment length. At the end of the section the wall boundary layers are only 10 cm
thick, leaving 80 cm of inviscid core suitable for model testing.
An external flow has no restraining walls and is free to expand no matter how thick
the viscous layers on the immersed body may become. Thus, far from the body the
flow is nearly inviscid, and our analytical technique, treated in Chap. 7, is to patch an
inviscid-flow solution onto a viscous boundary-layer solution computed for the wall
region. There is no external equivalent of fully developed internal flow. 6.3 Semiempirical Turbulent
Shear Correlations Throughout this chapter we assume constant density and viscosity and no thermal interaction, so that only the continuity and momentum equations are to be solved for velocity and pressure
dt Momentum: w
2 g V subject to no slip at the walls and known inlet and exit conditions. (We shall save our
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- Spring '08