A large amount of heat can be dissipated more efficiently by utilizing the latent heat than the sensible heat of coolant using condensation technique. In addition, cooling by microchannel is found as a promising method to dissipate more heat than the conventional channel. The application of condensation in a microchannel under different gravity conditions becomes very important due to rising demand in space technology, where compact high-performance electronic devices experience rise in temperature beyond the tolerable limit. The present numerical model explores the effect of different gravity conditions on the fluid flow and heat transfer characteristics of R134a condensation in a two-dimensional microchannel with a diameter of 100 µm. The gravity condition is varied from zero to normal gravity as g = 0, 0.1, 0.5, 1 and 9.81 m/s². Moreover, the effects of subcooled wall temperature, mass flux and vapour quality on two phase flow regimes, flow characteristics, temperature distribution, local and average Nusselt number behaviour are also investigated. The flow regime is significantly influenced by the gravity, wall temperature, mass flux and vapour quality and accordingly, different flow regimes are observed. The flow behaviour and temperature contour are also prominently dependent on the working parameters. The gravity condition has found to insignificantly affect the average condensation heat transfer properties in the considered microchannel.

与利用冷凝技术的冷却液显热相比，利用潜热可以更有效地散发大量热量。另外，发现微通道冷却是比常规通道散发更多热量的有前途的方法。由于航天技术的需求不断增长，在紧凑的高性能电子设备中温度升高超过了可承受的极限，在不同重力条件下在微通道中冷凝的应用变得非常重要。本数值模型探讨了在直径为100 µm的二维微通道中，不同重力条件对R134a冷凝液的流体流动和传热特性的影响。当g = 0、0.1、0.5、1和9.81 m / s时，重力条件从零变化到法向重力²。此外，还研究了过冷壁温，质量通量和蒸气质量对两相流态，流动特性，温度分布，局部和平均努塞尔数行为的影响。流动状态受重力，壁温，质量通量和蒸汽质量的影响很大，因此，观察到不同的流动状态。流动特性和温度轮廓也主要取决于工作参数。已经发现重力条件对所考虑的微通道中的平均冷凝热传递特性没有显着影响。