重力热管流动与传热特性的数值研究  

Simulation Study on Flow and Heat-transfer Characteristics of Gravity Heat Pipes

作　　者：战洪仁 张海松[1,2] 李春晓[1] 吴众[1] 

机构地区：[1]沈阳化工大学能源与动力工程学院,沈阳110142 [2]中钢集团鞍山热能研究院有限公司,辽宁鞍山114000

出　　处：《动力工程学报》2017年第7期540-545,共6页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(61473056;61104157)

摘　　要：采用计算流体力学(CFD)软件,在流体体积(VOF)模型中引入Boussinesq近似模型,以水为工质对不同加热功率下的重力热管进行了数值模拟,将实验、理论与数值结果三者结合对其内部流动与传热过程进行了分析.结果表明:CFD模拟得到的壁温与实验壁温吻合较好,可以用CFD可视化定性分析加热功率对重力热管传热特性的影响;在10~80 W范围内,随着加热功率的增大,蒸发段对流传热系数先增大后减小,冷凝段对流传热系数一直增大;当加热功率超过一定值时,蒸发段传热性能恶化,CFD可视化结果显示液池干涸,达到传热极限.By using computational fluid dynamics （CFD） software and introducing Boussinesq approximate model to the volume of fluid （VOF） model, numerical simulations were conducted on the gravity heat pipe under different heating power with water as the working medium, so as to study the flow and heat-transfer characteristics of the gravity heat pipe based on experimental, theoretical and simulation data. Results show that the wall temperature obtained by CFD simulation agrees well with that of experiment, and the CFD visualization can be used to qualitatively analyze the effects of heating power on the heat-transfer characteristics of gravity heat pipes. In the range of 10-80 W, with the increasing of heating power, the heat-transfer coefficient at evaporation section firstly increases and then decreases, while that at condensation section keeps increasing. Once the heating power exceeds a certain value, the heat-transfer performance at evaporation section deteriorates, when a dried up liquid pool could be observed through CFD visual- ization, indicating a heat transfer limit is already reached.

关 键 词：重力热管 蒸发 冷凝 VOF模型 CFD可视化 数值模拟 

分 类 号：TK172.4[动力工程及工程热物理—热能工程]