Fundamentals of Heat and Mass Transfer
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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Chapter 7, Problem 7.139P

Cylindrical dry-bulb and wet-bulb thermometers are installed in a large-diameter duct to obtain the temperature T and the relative humidity ϕ of moist air flowing through the duct at a velocity V. The dry-bulb thermometer has a bare glass surface of diameter D db and emissivity ε g . The wet-bulb thermometer is covered with a thin wick that is saturated with water flowing continuously by capillary action from a bottom reservoir. Its diameter and emissivity are designated as D wb and ε w . The duct inside surface is at a known temperature T s , which is less than T . Develop expressions that may be used to obtain T and ϕ from knowledge of the dry-bulb and wet-bulb temperatures T db and T wb and the foregoing parameters. Determine T and ϕ when T db = 45 ° C, T wb = 25 ° C, T s = 35 ° C, p = 1 atm, V = 5 m/s, D db = 3 mm, D wb = 4 mm, and ε g = ε w = 0.95. As a first approximation, evaluate the dry- and wet-bulb air properties at 45 and 25°C, respectively.

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Chapter 7 Solutions

Fundamentals of Heat and Mass Transfer

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