A 10 kg slab of Cr-V steel at 900 C is to be quenched by immersing in a vessel of water. Assume the slab exhibits a spatially uniform temp, T, and there is no heat transfer between water and air. The steel has a surface area of 0.5 m2 Assuming vessel is large enough such that water maintains constant temp of 20 C during quenching, determine average heat transfer coefficient required if steel cooling rate is to be -50 C/sec when T=650 C.
Assuming vessel contains a finite volume of water V = 2m3 which is initially at 20 C prior to quenching, determine average heat transfer coefficient required if steel cooling rate is to be -50 C/sec when T=650C. After quenching, what is final water temp?