Fundamentals of Heat and Mass Transfer
Fundamentals of Heat and Mass Transfer
7th Edition
ISBN: 9780470917855
Author: Bergman, Theodore L./
Publisher: John Wiley & Sons Inc
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Chapter 5, Problem 5.72P

A cold air chamber is proposed for quenching steel ball bearings of diameter D=0.2m and initial temperature Ti=400°C. Air in the chamber is maintained at 15°C by a refrigeration system, and the steel balls pass through the chamber on a conveyor belt. Optimum bearing production requires that 70% of the initial thermal energy content of the ball above 15°C be removed. Radiation effects may be neglected, and the convection heat transfer coefficient within the chamber is 1000W/m2K. Estimate the residence time of the balls within the chamber, and recommend a drive velocity of the conveyor. The following properties may be used for the steel: k=50W/mK,α=2×105m2/s, and c=450J/kgK.
Chapter 5, Problem 5.72P, A cold air chamber is proposed for quenching steel ball bearings of diameter D=0.2m and initial

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Chapter 5 Solutions

Fundamentals of Heat and Mass Transfer

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