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PS3 _2011

PS3 _2011 - = 10 Poise(a How long will it take for the...

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ChemE 323 (Spring 2011) Problem Set #3 (Due by 02/25/2011) 1.0 You are in charge of designing a pipe network to supply water to a subdivision located 2 miles away from a water holding tank. The water level in the tank is 150 ft. above ground; the pressure above the water in the holding tank is 1 atm; a minimum discharge pressure of 5psi above atmospheric is required; the average temperature is 65 o F; and the subdivision consumes a maximum of 1,000 gallons of water per minute. (a) What size schedule 40 commercial steel pipe should be used ? (b) If Sch 40 plastic piping is used instead, how would this change your result? Explain [30 points] 2.0 A solid particle (SG 1.5, diameter 5 mm.) is released in a liquid (SG 1, µ = 10
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Unformatted text preview: = 10 Poise). (a) How long will it take for the particle to reach 80% of its terminal velocity? (b) How would your answer change if the particle diameter is increased to 50 mm. and the fluid viscosity is reduced to 5.0 x 10-4 Pa.s? [35 points] 3.0 Denn 4.1 [25 points] 4.0 Denn 4.3 [25 points] 5.0 You have a granular solid (SG 4) comprised of particles with diameters 300 µ m and smaller. You want to separate out all particles with diameters 20 µ m and smaller by pumping water at 25 o C upwards through a slurry of the granular material in a column with diameter 10 cm. What flow rate is required to ensure that all particles with diameters in the desired range are swept out of the top of the column? [30 points]...
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