7th Edition

ISBN: 9780470501979

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

Publisher: Wiley, John & Sons, Incorporated

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Textbook Question

Chapter 7, Problem 7.51P

Pin fins are to be specified for use in an industrial cooling application. The fins will be subjected to a gas in cross flow at V = 10 m/s . The cylindrical tin has a diameter of D = 15 mm, and the cross-sectional area is the same for each configuration shown in the sketch.
Chapter 7, Problem 7.51P, Pin fins are to be specified for use in an industrial cooling application. The fins will be
For fins of equal length and therefore equal mass, which fin has the largest heat transfer rate? Assume the gas properties are those of air at T = 350 K . Hint: Assume the fins can be treated as infinitely long and apply the Hilpert correlation to the tin of circular cross section.

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Chapter 7, Problem 7.50P

Chapter 7, Problem 7.52P

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Chapter 7 Solutions

Fundamentals of Heat and Mass Transfer

Ch. 7 - Consider the following fluids at a film...Ch. 7 - Engine oil at 100C and a velocity of 0.1 m/s flows...Ch. 7 - Consider steady, parallel flow of atmospheric air...Ch. 7 - Consider a liquid metal (Pr1), with free stream...Ch. 7 - Consider the velocity boundary layer profile for...Ch. 7 - Consider a steady, turbulent boundary layer on and...Ch. 7 - Consider flow over a flat plate for which it is...Ch. 7 - A flat plate of width 1 m is maintained at a...Ch. 7 - An electric air heater consists of a horizontal...Ch. 7 - Consider atmospheric air at 25C and a velocity of...

Ch. 7 - Repeat Problem 7.11 for the case when the boundary...Ch. 7 - Consider water at 27°C in parallel flow over an...Ch. 7 - Explain under what conditions the total rate of...Ch. 7 - In fuel cell stacks, it is desirable to operate...Ch. 7 - The roof of a refrigerated truck compartment is of...Ch. 7 - The top surface of a heated compartment consists...Ch. 7 - Calculate the value of the average heat transfer...Ch. 7 - The proposed design for an anemometer to determine...Ch. 7 - Steel (AISI 1010) plates of thickness =6mm and...Ch. 7 - Consider a rectangular fin that is used to cool a...Ch. 7 - The Weather Channel reports that it is a hot,...Ch. 7 - In the production of sheet metals or plastics, it...Ch. 7 - An array of electronic chips is mounted within a...Ch. 7 - A steel strip emerges from the hot roll section of...Ch. 7 - In Problem 7.23. an anemometer design was...Ch. 7 - One hundred electrical components, each...Ch. 7 - The boundary layer associated with parallel flow...Ch. 7 - Forced air at 250C and 10 m/s is used to cool...Ch. 7 - Air at atmospheric pressure and a temperature of...Ch. 7 - Consider a thin, 50mm50mm fuel cell similar to...Ch. 7 - The cover plate of a flat-plate solar collector is...Ch. 7 - An array of 10 silicon chips, each of length...Ch. 7 - A square (10mm10mm) silicon chip is insulated on...Ch. 7 - A circular pipe of 25-mm outside diameter is...Ch. 7 - An L=1-m- long vertical copper tube of inner...Ch. 7 - A long, cylindrical, electrical heating element of...Ch. 7 - Consider the conditions of Problem 7.49, but now...Ch. 7 - Pin fins are to be specified for use in an...Ch. 7 - Prob. 7.52P Ch. 7 - Prob. 7.53P Ch. 7 - Hot water at 500C is routed from one building in...Ch. 7 - In a manufacturing process, long aluminum rods of...Ch. 7 - Prob. 7.58P Ch. 7 - To determine air velocity changes, it is proposed...Ch. 7 - Determine the convection heat loss from both the...Ch. 7 - Prob. 7.63P Ch. 7 - Prob. 7.64P Ch. 7 - Prob. 7.67P Ch. 7 - A thermocouple is inserted into a hot air duct to...Ch. 7 - Consider a sphere with a diameter of 20 mm and a...Ch. 7 - Prob. 7.76P Ch. 7 - A spherical, underwater instrument pod used to...Ch. 7 - Worldwide. over a billion solder balls must be...Ch. 7 - Prob. 7.80P Ch. 7 - Prob. 7.81P Ch. 7 - Consider the plasma spray coating process of...Ch. 7 - Prob. 7.83P Ch. 7 - Tissue engineering involves the development of...Ch. 7 - Consider temperature measurement in a gas stream...Ch. 7 - Prob. 7.89P Ch. 7 - A preheater involves the use of condensing steam...Ch. 7 - Prob. 7.91P Ch. 7 - A tube bank uses an aligned arrangement of...Ch. 7 - A tube bank uses an aligned arrangement of...Ch. 7 - Repeat Problem 7.94, but with NL=7,NT=10, and...Ch. 7 - Heating and cooling with miniature impinging jets...Ch. 7 - A circular transistor of 10-mm diameter is cooled...Ch. 7 - A long rectangular plate of AISI 304 stainless...Ch. 7 - A cryogenic probe is used to treat cancerous skin...Ch. 7 - Prob. 7.103P Ch. 7 - Prob. 7.104P Ch. 7 - Prob. 7.105P Ch. 7 - Consider the packed bed of aluminum spheres...Ch. 7 - Prob. 7.108P Ch. 7 - Prob. 7.109P Ch. 7 - Prob. 7.111P Ch. 7 - Packed beds of spherical panicles can be sintered...Ch. 7 - Prob. 7.114P Ch. 7 - Prob. 7.116P Ch. 7 - Prob. 7.117P Ch. 7 - Prob. 7.118P Ch. 7 - Prob. 7.119P Ch. 7 - Prob. 7.120P Ch. 7 - Dry air at 35°C and a velocity of 20 m/s flows...Ch. 7 - Prob. 7.123P Ch. 7 - Benzene, a known carcinogen, has been spilled on...Ch. 7 - Prob. 7.125P Ch. 7 - Prob. 7.126P Ch. 7 - Condenser cooling water for a power plant is...Ch. 7 - Prob. 7.128P Ch. 7 - In a paper-drying process, the paper moves on a...Ch. 7 - Prob. 7.131P Ch. 7 - Prob. 7.132P Ch. 7 - Prob. 7.133P Ch. 7 - Prob. 7.134P Ch. 7 - Prob. 7.136P Ch. 7 - It has been suggested that heat transfer from a...Ch. 7 - Prob. 7.138P Ch. 7 - Cylindrical dry-bulb and wet-bulb thermometers are...Ch. 7 - The thermal pollution problem is associated with...Ch. 7 - Cranberries are harvested by flooding the bogs in...Ch. 7 - A spherical drop of water, 0.5 mm in diameter, is...Ch. 7 - Prob. 7.143P Ch. 7 - Prob. 7.144P Ch. 7 - Prob. 7.145P Ch. 7 - Prob. 7.146P Ch. 7 - Prob. 7.147P Ch. 7 - Consider an air-conditioning system composed of a...Ch. 7 - Prob. 7.149P

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