For the present study numerical simulations of subcooled flow boiling of FC-72 in microgravity have been conducted to accompany boiling experiments performed in microgravity on the International Space Station (ISS). The numerical domain represents the geometry of the experimental test cell. For all simulations the open source framework OpenFOAM was employed, including extensions to the interFoam solver, which have been developed at the authors’ institute. A reference case has been defined applying intermediate values from the experimental parameter range as system parameters. This case has been examined thoroughly with regards to hydrodynamic phenomena and heat transfer during multiple, successive bubble cycles. Based on this reference case, the system parameters flow velocity, input heat flux, pre-heating time, and subcooling of the liquid bulk have been varied, and the impact of these quantities on bubble growth and movement as well as heat transfer have been studied. It was found, that an increased flow rate as well as increased subcooling lead to smaller bubbles and increased time between subsequent nucleations. A high input heat flux, an increased pre-heating time, and a decreased subcooling lead to a rapid cycle of bubble nucleation and coalescence.

对于本研究，已经进行了在微重力作用下FC-72的过冷流动沸腾的数值模拟，以伴随在国际空间站（ISS）上在微重力作用下进行的沸腾实验。数值域表示实验测试单元的几何形状。对于所有模拟，都使用了开源框架OpenFOAM，包括对interFoam求解器的扩展，这些扩展是在作者研究所开发的。已经定义了一个参考案例，将来自实验参数范围的中间值用作系统参数。在多次连续的气泡循环过程中，已对流体动力学现象和传热问题进行了彻底检查。基于此参考案例，系统参数包括流速，输入热通量，预热时间，液体团块的过冷和过冷已经改变，并且已经研究了这些量对气泡生长和运动以及传热的影响。已经发现，增加的流速以及增加的过冷度导致较小的气泡和增加随后成核之间的时间。高输入热通量，增加的预热时间和减少的过冷度会导致气泡成核和聚结的快速循环。