Redetermination of Mold/Cast Interface Heat transfer coefficient by the Virtual Adjunct Method

摘要

Garcia proposed the VAM (Virtual Adjunct Method) to obtain the analytical solution for the unidirectional solidification of metals in the mold which is cooled by air or water, and determined mold/cast h_i (interface heat transfer coefficient). However, the mold/cast interface boundary condition is not satisfied in his analytical solution, due to the constant t_0 (time to produce previous solidified layer in virtual system) calculated when t(solidification time in real system) = 0. In the previous study, the to was taken as the function of t, which converges when t = ∞, to satisfy the boundary condition. With this convergent constant, the new equation for the heat transfer coefficient was suggested. In this study, with the new equation, mold/cast hi values have been determined by experiment, and recalculated from Garcia's data.