3D打印钛合金毛细芯流动和传热的数值模拟

Numerical Simulation of Flow and Heat Transfer of 3D-printed Titanium Alloy Wick

毛细芯作为环路热管中的关键部件,其流动和传热特性决定了整个环路热管的性能。作为一种新型的毛细结构,3D打印毛细芯的研究尚在起步阶段。基于VOF、LEE等模型,对3D打印钛合金毛细芯的流动和传热特性进行了数值模拟,在1.95 W和2.96 W的热负荷下,模拟结果与实验结果拟合良好。对毛细芯湿工况的二维模拟结果显示,毛细芯的温度不仅取决于热负荷,还取决于毛细芯表面的两种传热机制,即毛细蒸发机制和热传导机制。

As a key component in the loop heat pipe, the flow and heat transfer characteristics of the wick determine the performance of the entire loop heat pipe. At present, the common homogeneous wicks in the loop heat pipe include sin-tered powder wicks, groove, ceramic wicks, etc. With the development of 3D-printed technology, 3D-printed wicks have begun to be applied to the loop heat pipe. As a new type of wick structure, 3D-printed wick has been barely investigated so far. In this paper, the flow and heat transfer characteristics of 3D-printed titanium alloy wick was numerically simulated by means of VOF method and LEE model. The simulation results agreed well with the experiment results in heat flux of 1.95W and 2.96 W. The 2D simulation of the wick showed the temperature of the wick did not depend solely on the heat flux, but on the two heat transfer mechanisms occurring on the surface of the wick, namely the capillary evaporation mechanism and the heat conduction mechanism.