Explanation Given: k A = 70 W / m . K T b = 100 ° C T ∞ = 20 ° C x A = 0.15 m x B = 0.075 m Assumptions: For the given two rods, fins assume as the infinitely long and it shows the expression as: T − T ∞ T b − T ∞ = e m x Position of rod A : x A Position of rod B : x B Thermal conductivity of rod A : k A Thermal conductivity of rod B : k B Calculation: Two rods are of same diameter but different materials used. Compare both rods by using assumption condition as: T − T ∞ T b − T ∞ = e m x The above eq

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ISBN: 9780470501962

Author: Frank P. Incropera, David P. DeWitt, Theodore L. Bergman, Adrienne S. Lavine

Publisher: Wiley, John & Sons, Incorporated

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Chapter 3, Problem 3.139P

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Thermal conductivity (kB) of rod B

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Chapter 3, Problem 3.138P

Chapter 3, Problem 3.140P

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Thermal conductivity ( k B ) of rod B

Solution Summary: The author compares two rods of the same diameter but different materials used.

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