Chapt06

Take the special case of commercial roughness ratio d

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Unformatted text preview: on tetrachloride at 20°C and p1 1100 kPa gage. What pipe diameter, in cm, is required to deliver a flow rate of 25 m3/h? P6.55 The reservoirs in Fig. P6.55 contain water at 20°C. If the pipe is smooth with L 4500 m and d 4 cm, what will EES the flow rate in m3/h be for z 100 m? L = 5 m, d = 3 cm ∆z 1 2m L, D, ε B 2 P6.49 | v v P6.50 Ethanol at 20°C flows at 125 U.S. gal/min through a horizontal cast-iron pipe with L 12 m and d 5 cm. Neglecting entrance effects, estimate (a) the pressure gradient dp/dx, (b) the wall shear stress w, and (c) the percent reduction in friction factor if the pipe walls are polished to a smooth surface. P6.51 The viscous sublayer (Fig. 6.9) is normally less than 1 percent of the pipe diameter and therefore very difficult to probe with a finite-sized instrument. In an effort to generate a thick sublayer for probing, Pennsylvania State University in 1964 built a pipe with a flow of glycerin. Assume a smooth 12-in-diameter pipe with V 60 ft/s and glycerin at 20°...
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