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Physics, 27.02.2020 03:51 rainbow7020

Circular copper rods of diameter D= 1.75 mm and length L= 25 mm are used to enhance heat transfer from a surface that is maintained at Ts,1= 100°C. One end of the rod is attached to this surface (at x= 0), while the other end (x= 25 mm) is joined to a second surface, which is maintained at Ts,2= 0°C. Air flowing between the surfaces (and over the rods) is also at a temperature of [infinity] T[infinity]= 0°C, and a convection coefficient of h= 125 W/m2·K is maintained. (1) What is the rate of heat transfer by convection from a single copper rod to the air, in W? (2) What is the total rate of heat transfer from a 1 m × 1 m section of the surface at 100°C, if a bundle of the rods is installed on 4-mm centers, in W?

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