# 3 - q = 10 5 W/m 2 . Determine the wall inner temperature T...

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2 mm 2 mm r i =60 mm r 1 =66 mm r 2 =70 mm r o =95 mm cylinder wall aluminum casing T i T 1 T b T a , h CHE 378: Heat and Mass Transfer Spring 2008 Homework 3 Due: Friday, February 1, 2008 at the beginning of lecture 1. Problem 10.13 in Middleman 2. Problem 10.15 in Middleman 3. Problem 10.23 in Middleman 4. Problem 10.29 in Middleman 5. It is proposed to air-cool the cylinders of a combustion chamber by attaching an aluminum casing with circumferential fins ( k = 240 W/m-K) of thickness 2 mm to the cylinder wall ( k = 50 W/m-K). The gap between each fin is also 2 mm. The air is at 320 K and the corresponding convection coefficient is 100 W/m 2 -K. For the system shown above, consider the following two cases: a. The heat flux along the inner surface of the cylinder wall is equal to
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Unformatted text preview: q = 10 5 W/m 2 . Determine the wall inner temperature T i , the interface temperature T 1 , the fin base temperature T b , and the rate of heat loss Q f through a single fin. Assume steady-state conditions. b. The gas mixture contained within the inner cylinder is at a constant temperature T g = 1100 K. The convective heat transfer coefficient between the gas and the inner wall of the cylinder is h g = 150 W/m 2-K. Determine the wall inner temperature T i , the interface temperature T 1 , the fin base temperature T b , and the total heat rate Q per unit length of cylinder (W/m). Assume steady-state conditions....
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## This note was uploaded on 02/12/2010 for the course CHE 378 taught by Professor Wang during the Spring '10 term at Purdue University-West Lafayette.

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