金属翅片对相变材料熔化储热速率的强化机理研究OA

To systematically investigate the impact of metal fins on the melting kinetics and heat-storage behavior of phase-change materials(PCMs),aluminum-alloy fins were integrated with a heated baseplate via selective laser melting(SLM)three-dimensional(3D)printing.Thereafter,these additively manufactured structures were embedded in n-octadecane to construct composite PCM units.Melting experiments were conducted via constant-temperature bottom heating to track the melting-front evolution.Concurrently,a numerical model of the metal fin/n-octadecane melting and heat-storage processes was developed using COMSOL Multiphysics,and its accuracy was validated via a comparative analysis with experimental results.Leveraging the validated model,the effects of the metal-fin height,gradient,number,distribution pattern,and material on the overall melting kinetics were analyzed through simulations.Resultsreveal that the 3D-printed metal fins significantly enhanced the heat-storage rate by expanding the effective heat-transfer area,directing heat flow,and altering the morphological evolution of the melting front.The heat-storage rate increased with the increasing fin height before reaching a saturation point,with the optimal height identified as 25 mm.Fin gradient exerted a negligible effect on the melting rate.Distributed fins further enhanced heat transfer,with the melting rate increasing at first before decreasing as the number of fins increased,reaching an optimum at five fins.Further optimization of the uniform 5a baseline into a non-uniform 0.5a+4a+0.5a configuration improved the heat-storage rate by an additional 8%,representing a 260%thermal enhancement over pure PCM,making it the most effective fin distribution in this study.Among conventionally employed SLM-compatible 3D-printed metallic materials,pure copper exerted the most significant enhancement effect on the melting rate owing to its high thermal conductivity,imparting a 40.57%enhancement compared with the aluminum-alloy variant.