Air enters a duct (100 cm *10 cm*10 cm) at 32°C at a rate of 0.28 m³/min to cool 138 W electronic component placed on the duct. Assuming 85 percent of the heat generated inside is transferred to air flowing through the duct and the remaining 15 percent is lost through the outer surfaces of the duct. What is the convective heat transfer coefficient (W/m2.°C), Assume fully developed flow for the whole channel length and (if flow is NOT Laminar use Dittus-Boelter ,0.8 equation:Nu=0.023 Re0.$Pr") C.-1007 J/kg.°C, v =1,654×10 3p 2 m /s, p = 1.146 kg/m Pr= 0.7268, k = 0.02625 W/m.°C

Air enters a duct (100 cm 10 cm10 cm) at 32°C at a rate of 0.28 m³/min to cool 138 W electronic component placed on the duct. Assuming 85 percent of the heat generated inside is transferred to air flowing through the duct and the remaining 15 percent is lost through the outer surfaces of the duct. What is the convective heat transfer coefficient (W/m2.°C), Assume fully developed flow for the whole channel length and (if flow is NOT Laminar use Dittus-Boelter ,0.8 equation:Nu=0.023 Re0.$Pr") C.-1007 J/kg.°C, v =1,654×10 3p 2 m /s, p = 1.146 kg/m Pr= 0.7268, k = 0.02625 W/m.°C

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

Air enters a duct (100 cm *10 cm*10
cm) at 32°C at a rate of 0.28 m/min to
cool 138 W electronic component
placed on the duct. Assuming 85
percent of the heat generated inside is
transferred to air flowing through the
duct and the remaining 15 percent is
lost through the outer surfaces of the
duct. What is the convective heat
transfer coefficient (W/m2.°C), Assume
fully developed flow for the whole
channel length and (if flow is NOT
Laminar use Dittus-Boelter
equation:Nu=0.023 Re0.8Pr")
E1007 J/kg.°C, v =1,654×10
m /s, p = 1.146 kg/m Pr= 0.7268, k =
0.02625 W/m. °C
Select one:

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