The Simulation Of Solid-Liquid Phase Change Coupled Natural Convection

Melting-solidification of the solid-liquid phase change heat transfer in theaerospace, energy, materials and construction industry has a very wide range ofapplications. In the solid-liquid phase change process, the liquid phase convective heattransfer, solid-phase thermal conductivity and phase transition mechanism for a varietyof different physical processes of physical coupling in each other, showing a relativelycomplex and have important research value physical phenomenon. This coupling ofnatural convection heat transfer of solid-liquid phase change, has important theoreticaland engineering application value.In this paper, The interface tracking method is developed for two-dimensionalnatural convection coupled solid-liquid phase change problems in numericalsimulation method, respectively, for the coupling of natural convection in squarecavity solid-liquid phase transition, cavity solid-liquid phase porous media change andpartial solid source of heat coupled with solid-liquid phase change boundary condition,the interface tracking method is verified in solving the coupling of natural convectionof the applicability of solid-liquid phase change.Firstly, interface tracking method is used to simulate the melting process.in asquare cavity under natural convection condition. The results are compared with theexperimental results which are obtained by Okada, and analyze the flow field andtemperature field, verify the accuracy of the interface tracking method. Furthermorechange the calculation condition, increase the Rayleigh number, the solid-liquidinterface location and percentage of melting process are calculated, and prove theinterface tracking method applies not only to melt under low Rayleigh number ofproblems, but also can handle the melting under high Rayleigh number problemsimulation by comparing with Ho and Viskanta results. The interface tracking methodis based on the fixed grid method, and subsequently with Gadgil and Gobin resultsobtained by using the deforming grid compared to verify the interface tracking methodwhen dealing with phase change is simple, accurate and fast.Secondly，further expansion of the interface tracking method is used to simulatethe melting problems in porous media. Comparetion between the results obtainedinterfacial tracking method and Beckermannand Viskanta’s results shows that interface tracking method can be applied to the low Prandtl number calculated under thesolid-liquid phase change problems.Finally，the interface tracking method is still used to calculate coupling phasechange heat transfer problems, respectively, the results are compared the experimentaldata and calculation results, show that the interface tracking method is still applicableto solve the coupled solid-liquid phase transition boundary problems.This work is supported by The U.S. National Science Foundation under grantnumber CBET-0730143、 National Since Foundation of China （No.51076105,No.50828601）、Board of Education key project of Shanghai Research and Innovation（No.10ZZ91） and Shanghai Leading Academic Discipline Project (No.J50501).