平行流热管管内流动与传热的数值模拟研究

Numerical simulation study on flow and heat transfer in parallel flow heat pipe

中文关键词: 热管  流动传热  数值模拟

英文关键词: heat pipe  heat transfer and flow  numerical simulation

中文摘要:

      为研究平行流热管的工作机理，本文基于Fluent软件中的VOF模型编写了蒸发冷凝相变的UDF程序，对不同功率下平行流热管管内两相流动和传热过程进行了数值模拟研究。模拟结果显示了初始阶段平行流热管管内的气液分布，启动阶段管内包括泡状流、弹状流、环状流等复杂流型的转变过程，稳定工作阶段工质在各并联管路中互激振荡流动。在高加热功率下，管内工质的互激振荡流动更为剧烈，热量输送距离更远。研究结果为平行流热管换热器的优化设计提供了参考依据。

英文摘要:

      In order to study the working mechanism of the parallel flow heat pipe, based on the Volume of Fluid model provided by computational fluid dynamics software Fluent and the User-Defined Function program of evaporation-condensation phase transformation, the numerical simulation of two phase flow and heat transfer processes in parallel flow heat pipes under different power was carried out. The results shows the gas-liquid distribution in the initial stage of the parallel flow heat pipe, the complex gas-liquid flow pat-tern transformation in the start-up phase including the bubble flow, the slug flow and the annular flow, and the mutual exchange oscillating flow heat transfer of working fluid in each parallel pipeline under steady working conditions. The high heating power improves the oscillating flow rate of the working fluid and the heat transfer capacity of the heat pipe in the axial direction. The study provides guidelines for the optimal design of parallel flow heat pipe heat exchangers。