A 3.5 m-long, 1.5-kW electrical resistance wire is made of 0.25-cm-diameter stainless steel (k=15 W/m.ºC). The resistance wire operates in an environment at 30°C. Determine the surface temperature of the wire if it is cooled by a fan blowing air at a velocity of 6 m/s. For evaluation of the air properties, the film temperature has to be found iteratively. As an initial guess, assume the film temperature to be 200°C (15 marks) 30°C 6 m/s 1.5 kW resistance ✓ heater