6th Edition

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 3.136P

A tantalum rod of diameter 3 mm and length 120 mm is supported by two electrodes within a large vacuum enclosure. Initially the rod is in equilibrium with the electrodes and its surroundings, which arc maintained at 300 K. Suddenly, an electrical current, I = 80 A , is passed through the rod. Assume the emissivity of the rod is 0. 1 and the electrical resistivity is 95 × 10 − 8 Ω ⋅ m . Use Table A.1 to obtain the other thermophysical properties required in your solution. Use a finite-difference method with a space increment of 10 mm.

Chapter 3, Problem 3.136P, A tantalum rod of diameter 3 mm and length 120 mm is supported by two electrodes within a large

(a) Estimate the time required for the midlength of the rod to reach 1000K.

(b) Determine the steady-state temperature distribution and estimate approximately how long it will take to reach this condition.

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Chapter 3, Problem 3.135P

Chapter 3, Problem 3.137P

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Chapter 3 Solutions

Introduction to Heat Transfer

Ch. 3 - Consider the plane wall of Figure 3.1, separating...Ch. 3 - A new building to be located in a cold climate is...Ch. 3 - The rear window of an automobile is defogged by...Ch. 3 - The rear window of an automobile is defogged by...Ch. 3 - A dormitory at a large university, built 50 years...Ch. 3 - In a manufacturing process, a transparent film is...Ch. 3 - Prob. 3.7P Ch. 3 - A t=10-mm-thick horizontal layer of water has a...Ch. 3 - Prob. 3.9P Ch. 3 - The wind chill, which is experienced on a cold,...

Ch. 3 - Prob. 3.11P Ch. 3 - A thermopane window consists of two pieces of...Ch. 3 - A house has a composite wall of wood, fiberglass...Ch. 3 - Prob. 3.14P Ch. 3 - Prob. 3.15P Ch. 3 - Work Problem 3.15 assuming surfaces parallel to...Ch. 3 - Consider the oven of Problem 1.54. 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Solution Summary: The author explains the minimum input power which affects the soldering. The thermal conductivity coefficient of copper is k=379W/m.

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