Question

A long, cylindrical, electrical heating element of diameter d = 10 mm, thermal conductivity k = 240 w/m.k, density ρ = 2700 kg/m3, and specific heat cp = 900 j/kg. k, is installed in a duct for which air moves in cross flow over the heater at a temperature and velocity of 27˚c and 10m/s, respectively. neglecting radiation, estimate the steady-state surface temperature when, per unit length of the heater, electrical energy is being dissipated at a rate of 1000 w/m

Answer 1

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