温差驱动型自反馈对流换热系统

在流体导热系统的基础上,引入热功转换子系统,构造了一种温差驱动型自反馈对流换热系统。它可以在无外界机械能输入的情况下,利用换热过程中的温差将部分热能转换为机械能驱动流体流动,达到强化换热的目的。通过最小火积耗散热阻原理优化了流体的对流换热过程,获得了给定条件下对流换热性能最优的速度场和温度场。结果表明:对于本文算例,自反馈系统的换热性能可达同边界条件下的纯导热系统的10倍,自然对流换热系统的8.4倍,验证了温差驱动型自反馈对流换热系统可以实现强化传热的设想。

Temperature difference driven self-feedback convective heat transfer system and its performance

This paper presents a temperature difference driven self-feedback heat convective system with an additional thermal power conversion subsystem based on a traditional heat conduction system.This self-feedback system converts a portion of thermal energy into mechanical energy to make fluid flow in the system.Numerical simulation of the flow and heat transfer performance of the system shows that the heat transfer coefficient of the self-feedback system is 10 times as much as that of heat conduction system and 8.4 times that of natural convection system.Thus the self-feedback system can enhance heat transfer without external mechanical energy input.