q3f06 - SECTION: CBE 320 Transport Phenomena NAME: December...

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SECTION: NAME: CBE 320 Transport Phenomena Exam III Part A: Short Answer 1. (5 pts.) What are the SI units of the following quantitities? a. k b. b C p c. α d. Q e. c W m 2. (5 pts.) Define, either in words or with an equation, the bulk fluid temperature T b for flow in a circular tube. 1
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3. (5 pts.) Consider the cocurrent heat exchanger depicted below. Sketch the temperature profiles T h ( z ) and T c ( z ) . Label the curves, indicating T h 1 , T h 2 , T c 1 and T c 2 . 4. (5 pts.) Write an integral expression for the rate of heat transfer from a submerged sphere, in terms of the fluid’s thermal conductivity k , and the temperature profile in the fluid T ( r, θ, φ, t ) . 2
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(5 pts) An egg is to be hard-boiled in a pot of boiling water at 100 C. Will the egg cook faster, slower, or at the same rate if the water is boiling rapidly (many bubbles) as opposed to boiling slowly (few bubbles). Note that the temperature of the water is the same in the two situations. Briefly explain your answer. 3
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q3f06 - SECTION: CBE 320 Transport Phenomena NAME: December...

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