强化对流传热场协同唯象机制及其控制

PHENOMENOLOGICAL PHYSICAL MECHANISMS AND CONTROL APPROACHES TO ENHANCING CONVECTIVE HEAT TRANSFER

根据对流传热强度与流体中存在的各种内场及其外场的关系,从唯象上阐明了降低温度边界层厚度、增加流体扰动和增加近壁面速度梯度的强化对流传热方法的物理机制,其本质是控制流体中内场及其外场之间的相互协同。给出了当流体中存在内场和外场时强化对流传热场协同控制方法,以此可指导发展强化对流传热单元的新方法。

Based on the relationship between convective heat transfer intensity and internal fields in the fluid as well as applied external fields, the three mechanisms for enhancing convective heat transfer, which are decreasing the temperature boundary layer thickness, increasing the interruption in the fluids and increasing the velocity gradient near heat transfer walls, is clarified phenomenologically. These results show that the essence of enhancing convective heat transfer is the synergy between different fields in the fluid as well as applied external fields. The control methods of filed synergy for the enhancement of convective heat transfer are discussed when there exist internal fields and applied external fields in the fluid, which can guides us to developing new approaches to designing convective heat transfer units.