Heat Transfer Characteristics of Composite Phase-Change Cavities with Needle-Fin Structure
Phase change materials have the advantages of large latent heat for phase change and good thermal stability.However,they also present challenges such as poor thermal conductivity and low heat transfer,and energy storage efficiency.To address the issue of low thermal conductivity in phase change materials,this paper employs numerical simulation to investigate the composite phase change process by adding copper needle fins to the paraffin cavity.It analyzes the simulated working conditions at the heating surface and the needle fins located at the top,left,and bottom of the cavity.The results indicate that the combined effect of top heating and the arrangement of needle fins significantly suppresses the formation of natural convection,reducing heat transfer efficiency and prolonging the total melting time.When the heating surface and needle fins are arranged at the bottom of the cavity,the distribution of the liquid phase of paraffin within the cavity is significantly enhanced,resulting in a more uniform distribution of heat throughout the cavity and more effective promotion of the melting of the phase change materials.The total melting time was reduced by 63.7%compared to pure paraffin.The energy storage rate reached 16.55 W,6.84 times higher than the configuration with the heating surface and needle fins integrated at the top.
万方数据
维普
