Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN: 9781305387102
Author: Kreith, Frank; Manglik, Raj M.
Publisher: Cengage Learning
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Chapter 2, Problem 2.19P

The rate of heat flow per unit length q/L through a hollow cylinder of inside radius r i and outside radius ro is

q / L = ( A ¯   k   Δ T ) / ( r o r i )

where A ¯ = 2 π / ( r o r i ) / ln ( r o / r i ) . Determine the percent error in the rate of heat flow if the arithmetic mean area π ( r o + r i ) is used instead of the logarithmic mean area A ¯ for ratios of outside-to-inside diameters ( D o / D j ) of 1.5, 2.0, and 3.0. Plot the results.

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Chapter 2 Solutions

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

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