A circular disk (ignore its thickness) of D = 1 m diameter is placed over a barbecue pit maintainedat T₁ = T2 = 600 K. The upper surface of the disk is exposed to quiescent ambient air andsurroundings at 300 K. The bottom surface and top surface of the disk has emissivities of εd.1 = 1.0and d2 = 0.9, respectively. The bottom and cylindrical side surface of the barbecue pit haveemissivities of 81 = 0.6 and ɛ2 = 1.0, respectively. Assume the disk and barbecue pit surfaces arediffuse and gray.A) Determine the net heat transfer rate to the cover, qnet,d, when Ta= 500 K.B) Plot qnet,d as a function of the disk temperature for 300 K < Ta< 600 K, using Excel orMATLAB. What is the steady-state temperature of the disk?gQuiescentAirTsur T300 KDisk--Ed.2 = 0.9Ed,1 = 1.0-T₂, ₂ = 1T₁, ₁ = 0.6;L= 0.5 mD=1m

B) To plot \( q_{\text{net,d}} \) as a function of \( T_{\text{disk}} \) for \( 300 \, \text{K} <…

Answered: A circular disk (ignore its thickness)…

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter11: Heat Transfer By Radiation

Section: Chapter Questions

Problem 11.66P

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A circular disk (ignore its thickness) of D = 1 m diameter is placed over a barbecue pit maintainedat T1 = T2 = 600 K. The upper surface of the disk is exposed to quiescent ambient air andsurroundings at 300 K. The bottom surface and top surface of the disk has emissivities of d,1 = 1.0and d,2 = 0.9, respectively. The bottom and cylindrical side surface of the barbecue pit haveemissivities of 1 = 0.6 and 2 = 1.0, respectively. Assume the disk and barbecue pit surfaces arediffuse and gray.A) Determine the net heat transfer rate to the cover, qnet,d, when Td = 500 K.B) Plot qnet,d as a function of the disk temperature for 300 K < Td < 600 K, using Excel orMATLAB. What is the steady-state temperature of the disk?
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