HW_11_problems - P5165 In turbulent flow near a flat wall...

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Unformatted text preview: P5165 In turbulent flow near a flat wall, the local velocity 217 7 P628 3 v varies only with distance 3‘ from the wall, wall shear stress 7,... and fluid properties p and u. The following data were taken in the University of Rhode Island wind tunnel for airflow, p = 0.0023 slug/r13, [.L = 3.81 5-7 slug/(ft - s), and r“. : 0.029 Ibf/ftz: y, in 5 0.021 0.035 3 0.055 I 0.080 f 0.12 i 0.16 .2 7 l u. ft/s i 50.6 54 l 5 .6 i 59.7 r635 i 65.9 ((1) Plot these data in the form of dimensionless :1 versus dimensionless y, and suggest a suitable power-law curve fit. (b) Suppose that the tunnel speed is increased until u = 90 ft/s at y = 0.11 in. Estimate the new wall shear stress, in lbf/ftz. For straightening and smoothing an airflow in a SO—em- diameter duct, the duct is packed with a “honeycomb” of thin straws of length 30 cm and diameter 4 mm, as in Fig. P628. The inlet flow is air at 110 kPa and 20°C, moving at an average velocity of 6 m/s. Estimate the pressure drop across the honeycomb. Thousands of straws P628 1.40ch P652 The pipe flow in Fig. P652 is driven by pressurized air in the tank. What gage pressure 121 is needed to provide a 20°C water flow rate Q = 60 mS/h? fl 30m rt Smooth pipe: Q = ——-p d 5 cm Open jet P652 P662 Water at 20°C is to be pumped through 2000 ft of pipe from reservoir 1 to 2 at a rate of 3 ft3/s, as shown in Fig. P662. If the pipe is cast iron of diameter 6 in and the pump is 75 percent gfficient, what horsepower pump is needed? Pu P662 ® mp t *P6.102 A 70 percent efficient pump delivers water at 20°C from one reservoir to another 20 ft higher, as in Fig. P6102. The piping system consists of 60 ft of galvanized iron 2— in pipe, 21 reentrant entrance, two screwed 90° long-radius elbows, a screwedvopen gate valve, and a sharp exit. What is the input power required in horsepower with and with— out a 6° well—designed conical expansion added to the exit? The flow rate is 0.4 nS/s. 6° cone ...
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