hw7asol-dist

hw7asol-dist - = 1400 kg/m 3 , = 0.001 Pa s. 75 m 12 m a....

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CBE 320 October 12, 2009 Transport Phenomena Problem Session VII Part A: Macroscopic Balances (Isothermal Systems) 1. An incompressible, Newtonian liquid (constant ρ =10 3 kg/m 3 , μ =10 3 Pa · s) fows into a tank at a fow rate w in = 1 kg/s, as depicted in the Fgure below. The liquid then fows out o± the tank through a pipe ( D =0 . 025 m, L =1 m). g H =? L =1m w in w out By reducing the appropriate macroscopic balances, determine: a. the steady-state mass fow rate out o± the pipe, w out . b. the steady-state height o± the liquid in the tank, H . 2. A Fre Fghting boat must deliver a jet o± water as high as 75 m. A pump draws water out o± the bay (22 C) and then ±orces it through a hose (I.D. 6 cm). The process is depicted below. The properties o± sea water are:
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Unformatted text preview: = 1400 kg/m 3 , = 0.001 Pa s. 75 m 12 m a. Assuming the hose exit is smooth ( i.e., the end is a straight cylinder without a nozzle), calculate the velocity out o the end o the hose required to obtain a height o 75 m above sea level. Hint: the fow is straight up and the velocity slows as the elevation increases. b. or the velocity obtained in part (a), determine the power required. The total length o hose is 15 m, and there are two 90 rounded elbows. 1 Solutions 1 HW 7A - Solutions 1/2 djk 10/12/09 2/3 3/3...
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This note was uploaded on 05/06/2010 for the course CBE 320 taught by Professor Staff during the Fall '08 term at Wisconsin.

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hw7asol-dist - = 1400 kg/m 3 , = 0.001 Pa s. 75 m 12 m a....

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