In this study, we investigated the R-1234yf distribution from a header into mini-channel tubes located in a horizontal plane, which may be of importance for cooling of an electric vehicle battery. Especially, the focus was concentrated on the effect of number of branch tubes on the two-phase distribution. The tests were conducted for the mass flux from 49 to 147 kg/m²s and inlet quality from 0.2 to 0.8. The effect of heat exchanger inclination was also investigated. The results showed that the flow distribution worsened as the number of branch tube increased. Between the normal and the parallel inlet configuration, the normal inlet yielded a better distribution, probably due to the smaller number of branch tubes. The flow distribution was mainly governed by the balance of relating forces-momentum and gravitational. Thus, a poor distribution was obtained for a tilted case, where the momentum and the gravitational forces were assisting. The data showed that a vapor quality was always beneficial to the distribution. However, the effect of mass flux was case-dependent. For the horizontal case, the mass flux pushed the flow downstream, and worsened the distribution. For the tilted case, the mass flux assisted or opposed the gravity, yielding a better distribution.

在这项研究中，我们研究了从集管到位于水平面的微型通道管中的 R-1234yf 分布，这可能对电动汽车电池的冷却很重要。尤其关注支管数量对两相分布的影响。测试是针对 49 至 147 kg/m ²的质量通量进行的s 和入口质量从 0.2 到 0.8。还研究了热交换器倾斜的影响。结果表明，随着支管数量的增加，流量分布恶化。在正常和平行入口配置之间，正常入口产生更好的分布，可能是由于支管数量较少。流动分布主要受相关力-动量和重力的平衡支配。因此，在倾斜的情况下获得了较差的分布，其中动量和重力是辅助的。数据表明，蒸汽质量总是有利于分布。然而，质量通量的影响是视情况而定的。对于水平情况，质量通量将流动推向下游，并使分布恶化。对于倾斜的情况，