hw7a - it through a hose (I.D. 6 cm). The process is...

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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) flows into a tank at a flow rate w in = 1 kg/s, as depicted in the figure below. The liquid then flows out of the tank through a pipe ( D = 0 . 025 m, L = 1 m). g H = ? L = 1 m w in w out By reducing the appropriate macroscopic balances, determine: a. the steady-state mass flow rate out of the pipe, w out . b. the steady-state height of the liquid in the tank, H . 2. A fire fighting boat must deliver a jet of water as high as 75 m. A pump draws water out of the bay (22 C) and then forces
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Unformatted text preview: it through a hose (I.D. 6 cm). The process is depicted below. The properties of sea water are: ρ = 1400 kg/m 3 , μ = 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 of the end of the hose required to obtain a height of 75 m above sea level. Hint: the flow is straight up and the velocity slows as the elevation increases. b. For the velocity obtained in part (a), determine the power required. The total length of hose is 15 m, and there are two 90 ◦ rounded elbows. 1...
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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 University of Wisconsin.

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