Question

Question 7 10 points Hot carbon dioxide exhaust gas at 1am is being cooled by flat plates. The gas at 220°C flows in paralel over the upper and lower surfaces of a 2 m long flat plate at a velocity of 2.7 ms and the fat plate surface temperature is maintained at 80°C Determine the heat transfer coefficinth in wim?c for the following conditions Re Number - 414.117.86 Thermal conductivity k 0.02652 Prandel Number Pr 0.8292

Answer 1

e

Solution : Ver P = 1 atm Too = 220°C l. = 2m y = 2.7m/s Ts=80°c Re= 414,117.86 K -0.02652 Wlonk Pr= 0.8292 since Recl5 so the flow in the flat peante is laminar flow average Now, the correlation of Nusselt Number for pete flat plate with constant coell temperature is given by NU = 0. 646 (Re) (P. he - 0.646 (214,1786) 3 (0.8292)'s de=l=2m - 0.6U6X (414, 117186) (0.8 h.2 0.02652 h = 5.178 w/mk ms transfer coefficient is so the required heat 5.778 W/mk