Physical quantity synergy in the field of turbulent heat transfer and its analysis for heat transfer enhancement

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-e 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.