The viscous sublayer (Fig. 6.9) is normally less than 1 percent of the pipe diameter and
Chapter 6, Problem p6.51(choose chapter or problem)
The viscous sublayer (Fig. 6.9) is normally less than 1 percent of the pipe diameter and therefore very diffi cult to probe with a fi nite-sized instrument. In an effort to generate a thick sublayer for probing, Pennsylvania State University in 1964 built a pipe with a fl ow of glycerin. Assume a smooth 12-in-diameter pipe with V 5 60 ft/s and glycerin at 208C. Compute the sublayer thickness in inches and the pumping horsepower required at 75 percent effi ciency if L 5 40 ft.
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