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Unformatted text preview: 9)
Rough-wall pipe flows (Fig. 6.12)
Secondary flow in ducts (Fig. 6.16)
Minor-duct-loss coefficients (Sec. 6.7) Chapter 7 will treat a great many more external-flow experiments, especially in Sec.
7.5. Here we shall show data for one type of internal flow, the diffuser. | v v Diffuser Performance A diffuser, shown in Fig. 6.26a and b, is an expansion or area increase intended to reduce velocity in order to recover the pressure head of the flow. Rouse and Ince  relate that it may have been invented by customers of the early Roman (about 100 A.D.)
water supply system, where water flowed continuously and was billed according to
pipe size. The ingenious customers discovered that they could increase the flow rate at
no extra cost by flaring the outlet section of the pipe.
Engineers have always designed diffusers to increase pressure and reduce kinetic
energy of ducted flows, but until about 1950, diffuser design was a combination of art,
luck, and vast amounts of empiricism. Small changes in design paramete...
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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.
- Spring '08