(40%)Q2. Air flows perpendicular to steel rod having a square cross sectional area with an edge length of 5 cm. Velocity and temperature of air are 8 m/s and 30 °C. Temperature of steel rod is 220 °C. Determine heat transfer rate per length of rod. Properties of air: p=0.8711 kg/m”, u = 230.1x10-7 Ns/m², Cp= 1,014 kJ/kg:K, Pr=0.69 k= 33.8x10-3 W/m:K, v = 26.41x10-6 m²/s Vair = 8 m/s Tsurface = 220 °C Tair = 30 °C 5 cm