Ambient air at 20C flows over a 30-cm-diameter hot spherical object with a velocity of 2.5 m/s.

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Ambient air at 20°C flows over a 30-cm-diameter hot spherical object with a velocity of 2.5 m/s. If the average surface temperature of the object is 200°C, the average convection heat transfer coefficient during this process is

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Heat And Mass Transfer Fundamentals And Applications

ISBN: 9780073398181

5th Edition

Authors: Yunus Cengel, Afshin Ghajar

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Question Posted: Sep 15, 2023 09:42 AM

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Ambient air at 20C flows over a 30-cm-diameter hot spherical object with a velocity of 2.5 m/s.

Question:

(a) 5.0 W/m-K (c) 7.5 W/m-K (e) 11.7 W/m.K (b) 6.1 W/m-K (d) 9.3 W/m.K (For air, use k = 0.2514 W/m-K, Pr = 0.7309, v= 1.516 X 10-5 m²/s, μ = 1.825 x 10-5 kg/m-s, p = 2.577 x 10-5 kg/m-s)

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The answer is d 93 WmK The average convection heat transfer coefficient can be calculated using the ...View the full answer

Heat And Mass Transfer Fundamentals And Applications

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