Theoretically and numerically investigation about the novel evaluating standard for convective heat transfer enhancement based on the entransy theory

摘要

This paper theoretically and numerically investigated a novel evaluating standard δ_e for the enhancement of convective heat transfer based on the entransy theory. In the theoretical derivation, the differential equations about entransy are established using the method of micro-control volume which can give the obvious physical changing processes. And then, an efficiency factor δ_e is recommended according to physical mechanisms of entransy dissipation which is considered the impact of energy dissipation. The principle is verified by numerical simulation. The results indicated that δ_e is more appropriate for evaluating the ability of convective heat transfer enhancement comparing with the traditional method of FSP (field synergy principle) and EDEP (entransy dissipation extremum principle). The results also showed that the higher the factor of δ_e, the more efficient heat transfer process.