The lower side of a 400-mm-diameter disk is heated by an electric furnace, while the upper side

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The lower side of a 400-mm-diameter disk is heated by an electric furnace, while the upper side is exposed to quiescent, ambient air and surroundings at 300 K. The radiant furnace (negligible convection) is of circular construction with the bottom surface (?₁ = 0.6) and cylindrical side surface (?₂ = 1.0) maintained at T₁ = T₂ = 500 K. The surface of the disk facing the radiant furnace is black (E_{d, 1} = 1.0), while the upper surface has an emissivity of E_{d, 2} = 0.8. Assume the plate and furnace surfaces to be diffuse and gray.

(a) Determine the net heat transfer rate to the disk, q_net.d' when T_d = 400 K.

(b) Plot q_net.d as a function of the disk temperature for 300 T_d 500 K, with all other conditions remaining the same. What is the steady-state temperature of the disk?

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KNOWN Disk heated by an electric furnace on its lower surface and exposed to an environment on its upper surface FIND a Net heat transfer to or from the disk qnetd when Td 400 K and b Compute and plot ...View the full answer

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Related Book For book-img-for-question

Fundamentals of Heat and Mass Transfer

ISBN: 978-0471457282

6th Edition

Authors: Incropera, Dewitt, Bergman, Lavine

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Question Posted: Mar 02, 2011 06:00 AM

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KNOWN Disk heated by an electric furnace on its lower surface and exposed to an environment on its upper surface FIND a Net heat transfer to or from the disk qnetd when Td 400 K and b Compute and plot ...View the full answer

Fundamentals of Heat and Mass Transfer

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