Optimization of the interface heat transfer coefficient model based on the dynamic thermo-physical parameters in the pressure-temperature coupled field

Abstract Based on the inverse method, the dynamic thermo-physical parameters of the sand mold in the pressure-temperature coupled field were used for calculation. The optimized inverse method model of interface heat transfer coefficient (IHTC), which combined with the three-layer Dufort-Frankel difference equation, was developed to reveal the effects of pressure on IHTC. The results showed that the IHTC was the maximum at the beginning due to high heat flux at the interface under the influence of pressure, then a rapid reduction on account of the forming of air gap and variation of thermo-physical parameters, then slowly stabilize. Compared with the classical inverse model using the static thermo-physical parameters, the accuracy of the calculated temperature field obtained by the optimized inverse model was improved by 18% at most.