本文对微通道换热器垂直集管内R134a和PAG油的上行流动进行了实验研究。在实验装置中模拟了可逆系统热泵模式下的流动结构:冷冻油混合物从底部通道进料，从顶部通道流出。实验中的入口质量在0.2到0.8之间变化，质量流量为4.19 g s-1（0.0092 lb s-1）。可以看出，少量石油（OCR=0.5%）会恶化分布。但进一步将OCR提高到2.5%和4.7%，分布变得更好。将实验质量分布结果纳入微通道换热器模型，以评估蒸发器性能。最初的数值结果表明，虽然随着油量的增加，冷却能力不断降低，但分布有所改善。与均匀分布情况相比，由于分布的改善，容量退化有所减少。 引用:ASHRAE论文CD:2014 ASHRAE冬季会议，纽约

This paper presented an experimental study about R134a and PAG oil upward flow in a vertical header of a microchannel heat exchanger. The flow configuration in the heat pump mode of reversible systems was mimicked in the experimental facility: the refrigerant-oil mixture was fed from the bottom pass and exits through the top pass. The inlet quality in the experiments was varied from 0.2 to 0.8, and mass flow rate is 4.19 g s-1 (0.0092 lb s-1). It has been seen that small amount of oil (OCR=0.5%) worsened the distribution. But further increasing the OCR to 2.5% and 4.7%, the distribution became better. The experimental quality distribution results were incorporated in a microchannel heat exchanger model to evaluate the evaporator performance. Initial numerical results showed that although the distribution was improved with more oil, the cooling capacity kept reducing. The capacity degradation compared with the uniform distribution case decreased due to theimprovement of distribution.