Fundamentals of Heat and Mass Transfer
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 7.3P
Consider steady, parallel flow of atmospheric air over a flat plate. The air has a temperature and free stream velocity of 300 K and 25 m/s.
- Evaluate the boundary layer thickness at distances of
- Evaluate the surface shear stress and the y-velocity component at the outer edge of the boundary layer for the single plate at
- Comment on the validity of the boundary layer approximations.
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Students have asked these similar questions
1. A fan that can provide air speeds up to 50 m/s is to be used in a low-speed wind
tunnel with atmospheric air at 25°C. If one wishes to use the wind tunnel to study
flat-plate boundary layer behavior up to Reynolds numbers of Rex=108, what is
the minimum plate length that should be used? At what distance from the leading
edge would transition occur if the critical Reynolds number were Rex,c=5×105?
Answer: 31.4m 0.157m
Calculate the heat transfer from a 60 cm x 60 cm plate on which air flows at 40⁰C and. The plate temperature is 100⁰ C while the air speed is 5 m/s.Find the thickness of the boundary layer at a distance of x = 20 cm.
Calculate the heat transfer (in Watts) in the first 20 cm of the plate assuming unit depth, if the
plate is heated to a temperature of 100C over it complete length with air flowing over it at a
temperature of 27°C.
[Properties of air at 63.5°C are: k = 0.02749 W/mK, v = 17.36 x 10“ m/s, Cp = 1.006 kJ/kg
K and Pr= 0.7.]
Chapter 7 Solutions
Fundamentals of Heat and Mass Transfer
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