INTERFACIAL HEAT TRANSFER COEFFICIENT ESTIMATION DURING SOLIDIFICATION OF RECTANGULAR ALUMINUM ALLOY CASTING USING TWO DIFFERENT INVERSE METHODS

To get accurate results in casting simulations, prediction of interfacial heat transfer coefficient (IHTC) is imperative. In this paper an attempt has been made for estimating IHTC during solidification process of a rectangular aluminium alloy casting in a sand mould. The cast temperature and mould temperature are measured during the experimental process at different time intervals during the process of solidification. Two different inverse methods, namely control volume and Beck’s approach are used to estimate the heat flux and temperature at the mould surface by using the experimentally measured temperatures. In the case of control volume technique, the partial derivative of one dimensional transient heat conduction equation for the rectangular geometry is modified into an ordinary differential derivative with respect to time. These equations are solved sequentially to get the heat flux and temperature at the mould surface. The same partial derivatives are solved using the function specification method in Beck’s approach. The IHTC values obtained by these two approaches are in good agreement with the results cited in literature.