Aheated long cylindrical rod is placed in a cross flow of air at 20°c (1 atm) with velocity of 10 m/s. the rod has a diameter of 5 mm and its surface has an emissivity of 0.95. if the surrounding temperature is 20°c and the heat flux dissipated from the rod is 15700 w/m2, determine the surface temperature of the rod. evaluate the air properties at 70°c. the properties of air (1 atm) at 70°c are k = 0.02881 w/m∙k, v = 1.995 × 10−5 m2/s, and pr = 0.7177.