《Table 1Physical properties of copper foam and paraffin.》

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《Effect of Pore Distribution on Melting Behavior of Paraffin in Fractal Metal Foam》

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For purpose of theoretically studying the melting performances of paraffin in the copper foams，a twodimensional unsteady heat transfer model accompanied with melting of paraffin embedded in pores of copper foams is established.As shown in Fig.3，except for the constant wall temperature boundary（Th）at the bottom，the other boundaries are adiabatic.Because if the left boundary is chosen as the heat source boundary，the left part of pores filled with paraffin melt first.The left boundary heat can produce local convection of the liquid paraffin，that is，the upper left corner of the solid paraffin melts faster than that of the lower left corner.But if the thermal boundary is below，the effect of the liquid paraffin convection can be eliminated.The length of the square computational domain H is 300 mm.The coefficient of thermal conductivity（λ），the specific heat（cp）and density（ρ）of the copper foam and paraffin，as well as the phase transition temperature（Tm）and latent heat（Lat）of paraffin are listed in Table 1，respectively.