For turbulent flow in a tube, the heat transfer coefficient is obtained by using following empirical equation. Nu 0.023 Re Pr Here, n is 0.4 for heating and 0.3 for cooling. If the diameter is doubled and the flow rate is halved, then the heat transfer coefficient will changed by a factor of a) 0.41 b) 0.41 c) 0.61 d) 0.16 Answer OA B C