基于火积耗散理论的并联热管传热特性仿真分析

Simulation and Analysis of Heat Transfer Characteristics of Parallel Gravity Heat Pipe Based on Entransy Dissipation Theory

根据火积耗散理论,建立了热管内气液二相介质的火积耗散率数学表达式,并将其编译成C语言程序嵌入到Fluent计算中,模拟分析并联分离式重力热管的传热特性.研究结果表明:热管传热过程中的不可逆损失主要由温差传热和相变两部分组成,在热管冷凝段,相变火积耗散数集中分布在热管顶端,约占冷凝段总火积耗散数的97.7%;此外,热管内总火积耗散数与加热功率呈正相关,随着加热功率的增加,热管内总体的不可逆程度增大.

Based on the entransy dissipative theory,the entransy dissipative rate mathematical expression of gas-liquid two-phase medium in heat pipe is established,which is compiled into C language program and embedded into fluent calculation to simulate and analyze the heat transfer characteristics of parallel separated gravity heat pipe.The results show that the irreversible loss in the heat pipe is mainly composed of temperature difference heat transfer and phase change.In the condensation section of the heat pipe,the phase change entransy dissipation number is concentrated on the top of the heat pipe,accounting for 97.7%of the total entransy dissipation number in the condensation section.In addition,the total entransy dissipation number in the heat pipe is positively correlated with the heating power.With the increase of heating power,the overall irreversibility in the heat pipe increases.