<p>Fundamentals of Heat and Mass Transfer 6th edition problem 5.57 (pg331)<br />

Question

<p>Fundamentals of Heat and Mass Transfer 6th edition problem 5.57 (pg331)<br /><br />In heat treating to harden steel ball bearings (c=500j/kg k), (density=7800kg/m³ ), (k=50 W/m K), it is desirable to increase the surface temperature for a short time without significantly warming the interior of the ball.&#160; Thei type of heating can be accomplished by sudden immersion of the ball in a molten salt bath with T = 1300K and h = 5000 W/m² .&#160; Assume that any location within the ball whose temperature exceeds 1000K will be hardened.&#160; Estimate the time required to harden the outer millimeter of a ball of diameter 20 mm, if its initial temperature is 300K.</p>

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http://s2.postimage.org/59o9auefw/mech2.png

Part 2:-
http://s2.postimage.org/59nm5bjj0/mech1.png

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