Based on the principle of physical quantity synergy in the field of laminar heat transfer,and according to the models of zero equation and k-ε two equations for the turbulent flow,the synergy equations for both energ...Based on the principle of physical quantity synergy in the field of laminar heat transfer,and according to the models of zero equation and k-ε two equations for the turbulent flow,the synergy equations for both energy and momentum conservation in the turbulent heat transfer are established.The synergy regulation among heat flux,mass flow and fluid driving force,and the mechanism of heat transfer enhancement it reflects are revealed.The synergy principle of physical quantity in the thermal flow field is extended from laminar flow to turbulent flow.The principle is verified to be universal by the calculation of heat transfer enhancement in a tube with an insert of helical twisted tape.Thus,corresponding to the synergy relation among physical quantities in the turbulent flow field,the performance of convective heat transfer and flow resistance for the tubes with different heat transfer components and surface can be compared through theoretical and computational analysis,which thereby provides a guidance for designing heat transfer units and heat exchangers.展开更多
埋地换热器换热性能是地源热泵设计基础,针对不同埋管方式埋地换热器建立了砂石回填单 U 型、双 U 型井埋管和混凝土回填单 U 型井埋管的单井实验系统,开展埋地换热器单井的换热性能实验研究。研究了不同的土壤物性、回填材料、埋管数...埋地换热器换热性能是地源热泵设计基础,针对不同埋管方式埋地换热器建立了砂石回填单 U 型、双 U 型井埋管和混凝土回填单 U 型井埋管的单井实验系统,开展埋地换热器单井的换热性能实验研究。研究了不同的土壤物性、回填材料、埋管数量和运行工况下单井换热器换热性能。展开更多
基金supported by the National Basic Research Program of China (2007CB206903)the National Natural Science Foundation of China (50721005)
文摘Based on the principle of physical quantity synergy in the field of laminar heat transfer,and according to the models of zero equation and k-ε two equations for the turbulent flow,the synergy equations for both energy and momentum conservation in the turbulent heat transfer are established.The synergy regulation among heat flux,mass flow and fluid driving force,and the mechanism of heat transfer enhancement it reflects are revealed.The synergy principle of physical quantity in the thermal flow field is extended from laminar flow to turbulent flow.The principle is verified to be universal by the calculation of heat transfer enhancement in a tube with an insert of helical twisted tape.Thus,corresponding to the synergy relation among physical quantities in the turbulent flow field,the performance of convective heat transfer and flow resistance for the tubes with different heat transfer components and surface can be compared through theoretical and computational analysis,which thereby provides a guidance for designing heat transfer units and heat exchangers.
