hw12b - a good approximation to assume that the tube wall...

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CBE 320 November 16, 2009 Transport Phenomena Problem Session XII Part B: Macroscopic Balances for Nonisothermal Systems 1. Work problem 15A.1 in BSL 2. Work problem 15A.2 in BSL 3. Work problem 15A.4 in BSL 4. Chilling Oil with an Ice Bath An incompressible oil is to be chilled using an ice bath as indicated in the figure below. Your job is to calculate the required tube length . The oil flows through the tube (I.D. 0.003175 m), entering the bath at T b 1 = 25 C. The oil is to leave the bath at T b 2 = 10 C. The oil mass flow rate is 0.01 kg/s. Since the bath is well-stirred, it is
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Unformatted text preview: a good approximation to assume that the tube wall temperature, T , is constant at 0 C. Calculate the tube length, L , required to obtain the desired change in oil temperature. The physical properties of the oil are as follows (assumed to be independent of temperature over this range). = 800 kg/m 3 = 0.002 Pa s C p = 4200 J/(kg C) k = 0.15 W/mK 5. Work problem 15B.8 in BSL 1...
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