62 flow issuing at constant speed from a pipe a

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Unformatted text preview: : (a) highviscosity, low-Reynolds-number, laminar flow; (b) low-viscosity, high-Reynolds-number, turbulent flow. [From Illustrated Experiments in Fluid Mechanics (The NCFMF Book of Film Notes), National Committee for Fluid Mechanics Films, Education Development Center, Inc., copyright 1972.] | v v How did turbulence form inside the pipe? The laminar parabolic flow profile, which is similar to Eq. (4.143), became unstable and, at Red 2300, began to form “slugs” or “puffs” of intense turbulence. A puff has a fast-moving front and a slow-moving rear | e-Text Main Menu | Textbook Table of Contents | Study Guide 328 Chapter 6 Viscous Flow in Ducts Flow (a) (b) (c) Fig. 6.3 Formation of a turbulent puff in pipe flow: (a) and (b) near the entrance; (c) somewhat downstream; (d) far downstream. (From Ref. 45, courtesy of P. R. Bandyopadhyay.) (d ) and may be visualized by experimenting with glass tube flow. Figure 6.3 shows a puff as photographed by Bandyopadhyay [45]. Near the entrance (Fig. 6.3a and b) there is an ir...
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This note was uploaded on 10/27/2009 for the course MAE 101a taught by Professor Sakar during the Spring '08 term at UCSD.

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