Along, square, electrical heating element standing on a corner with one side of the square heating...

Along, square, electrical heating element standing on a corner with one side of the square heating element being 25mm, thermal conductivity k = 240 W/m ? K, density ñ = 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 30°C and 10 m/s, respectively.

(a) 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. ?

(b) If the heater is activated from an initial temperature of 30°C, estimate the time required for the surface temperature to come within 20°C of its steady-state value. ?

Expert Solution

samet mamat answered 2 years ago

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