Homework Set No 2

# Homework Set No 2 - outlet of the pump are 100 kPa and 300...

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Homework Set No. 2 (3 questions) ChE 354 Fall 2007 Poehl 1. Stately, plump Buck Mulligan came from the stairhead, bearing a bowl of lather on which a mirror and a razor lay crossed. He set this down and grabbed a garden hose, and pointed it straight up. He placed his thumb over the stream. If the hose supply pressure was 400 kPa(gauge) and the velocity in the hose just upstream of his thumb was 0.6 m/s, what was the maximum height the spray reached? 2. Mr. Leopold Bloom, in addition to eating mutton kidneys, loves to set up water distribution systems across Dublin. One particular system is powered by a 15 kW electric motor with an efficiency of 90%. His wife Molly told him the flow rate through the pump is 50 L/s, and the diameter of the inlet and outlet pipes are the same and the elevation difference across the pump is negligible. (She did not tell him that she is having an affair with Hugh “Blazes” Boylan.) If the pressures of the inlet and
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Unformatted text preview: outlet of the pump are 100 kPa and 300 kPa absolute, respectively, determine the mechanical efficiency of the pump and the temperature rise of the water due to this mechanical inefficiency. 3. Stephen Dedalus is an artist, not an engineer. He offers you \$5 (or five of whatever they used in Ireland on June 16, 1904) to help him with the following pipe problem. He has a large supply of rusty 2 inch Schedule 40 steel pipe, which he wants to use for a pipeline. Because rusty metal is rougher than clean metal, he wants to know the effective roughness before laying the pipeline. To do this, he pumps water at a rate of 100 GPM through a 100 ft long section fo pipe and finds that the pressure drop is 15 psi. What is the effective pipe roughness in inches? HINT: Consider using an expression relating the roughness factor to the friction factor for fully developed turbulent flow....
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## This homework help was uploaded on 04/17/2008 for the course CHE 353 taught by Professor Poehl during the Fall '07 term at University of Texas.

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