Question: A solid cube of side 30 cm is at an initial temperature of 1000 K. The cube is then suddenly immersed in a tub of

A solid cube of side 30 cm is at an initial temperature of 1000 K. The cube is then suddenly immersed in a tub of cold water kept at 288 K. The convection heat transfer coefficient is 150 W/m2K. The material of the cube has density () = 2700 kg/m3 , k = 235 W/mK and Cp = 0.9 kJ/kg K

Calculate (i) the time required to cool the cube to 500 K. (ii) Biot number for the process

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