CAJ | 학술논문

通过构建泡沫金属内固液相变传热模型，对方腔蓄热单元中泡沫铜强化石蜡相变蓄热特性进行数值分析。数值模型采用考虑泡沫金属真实结构的等效导热系数通用模型，并兼顾石蜡在融化前后与金属骨架之间的热非平衡效应。通过求解模型得到方腔内石蜡固液界面演化规律与温度分布，进而对蓄热过程进行火用分析。结果表明：当前数值模型能较好地预测泡沫铜内固液相变传热；泡沫铜显著改善了石蜡相变的空间均匀性，减小了蓄热区温度梯度，使蓄热速率和火用效率得到有效提高。
통과구건포말금속내고액상변전열모형，대방강축열단원중포말동강화석사상변축열특성진행수치분석。수치모형채용고필포말금속진실결구적등효도열계수통용모형，병겸고석사재융화전후여금속골가지간적열비평형효응。통과구해모형득도방강내석사고액계면연화규률여온도분포，진이대축열과정진행화용분석。결과표명：당전수치모형능교호지예측포말동내고액상변전열；포말동현저개선료석사상변적공간균균성，감소료축열구온도제도，사축열속솔화화용효솔득도유효제고。
Phase change heat storage enhancement of paraffin using copper foam in a square cavity was numerically studied. A model for solid-liquid phase change heat transfer in metal foam was established.The effective thermal conductivity of metal foam was calculated using an analytical model considering the actual foam structure and application generality.The thermal non-equilibrium effect between metal skeleton and solid/liquid paraffin was also considered.The evolution of solid-liquid interface and temperature distribution in the cavity were numerically simulated and analyzed.The exergy performance of the phase change heat storage process was also discussed.It is shown that copper foam widens the phase change area of paraffin,and decreases the temperature gradient in the cavity.As a result,the related phase change rate and exergy efficiency are effectively promoted by introducing copper foam into paraffin.