Heat and Mass Transfer Analysis of Scrap Melting in Steel Bath

Abstract

In order to examine the effect of several parameters on steel scrap melting in molten steel, the heat and mass transfer coefficients were evaluated. The change in radius of steel scrap with time was obtained by the experiment with 30kg steel bath. The simultaneous heat and mass transfer equations were numerically solved with the proper parameters which were obtained by adjusting the computed radius change to the experimental one. The results are summarized as follows;
(1) The heat transfer coefficient was evaluated as 27.7 to 77.2 kW/m²K, and the mass transfer coefficient, as 0.83 to 2.08×10^-4m/s.
(2) The heat transfer coefficient decreases with an increase in radius.
(3) Both coefficients are independent of carbon content in steel bath.
(4) Both coefficients increase with an increase in temperature.
(5) The dimensionless correlation for heat and mass transfer are given as
Nu=0.017Re^0.8Pr^1/3, Sh=0.017Re^0.8Sc^1/3