A smooth, flat, thin fin of copper extending out from a tube is51 mm by 51 mm square. Its temperature is approximatelyuniform at 82.2° C.Cooling air at 15.6° C and 1 atm abs flows parallel to thefin at a velocity of 12.2 m/s.a)For laminar flow, calculate the heat-transfer coefficient, h.b)If the leading edge of the fin is rough so that all of theboundary layer or film next to the fin is completely turbulent,calculate h. [77.2 W/m²]For air at 48.9° C: µ= 1.9× 10-5 Pa s, p= 1.097 kg/m³, k =0.028 W/m K and Np. = 0.704

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Answered: A smooth, flat, thin fin of copper…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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Air at 295 K flows at 3 m/s over a flat plate at 390 K. The air properties are as follows: density =1.1 kg/m3, viscosity =18.1×10−6 Pa.s, specific heat capacity =1005 J/kgK, and thermal conductivity =0.024 W/mK. The velocity and temperature profiles are assumed to be linear, giving the local Nusselt number to be Nux = 0.289 Rex1/ 2Pr1/3. The flow will become turbulent at a Reynolds number of 5×105. Assume the width of the plate perpendicular to the air flow is 1 m. At what distance from the leading edge does the flow become turbulent? ________m What is the heat transfer at the point of transition? ___________W What is the total heat transfer along the length of the plate where the flow is laminar? __________W
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