Question

The deduction of cooling rate from a simple heat balance can only be possible when the process is isothermal and the specific heats of the liquid and the solid are same.

(a) True

(b) False

I had been asked this question by my school teacher while I was bunking the class.

I'd like to ask this question from Rate of Solidification topic in division Cooling and Solidification of Casting-Forming-Welding I

Answer 1

The correct choice is (a) True

Easiest explanation: In the solidification process, extraction of heat can be achieved by applying a suitable cooling to the molten metal in order to create a heat flux. The cooling rate can be deduced from a simple heat balance only if the process is isothermal (low cooling rate) and the specific heats of the liquid and the solid are the same.