ABSTRACT

R-134a distribution in an evaporator having two-row/six-pass configuration was experimentally studied with the inlet quality 0.2 and the outlet superheat 5°C. The mass flux was varied from 63 kg/m²s to 117 kg/m²s. The flow distribution generally followed the expected trend. The insert configuration (multi-hole or a single rectangular hole) affected only nearly passes. Furthermore, better liquid distribution was obtained for the single rectangular hole insert. The effect of tube protrusion depth was only significant at the first pass. As a result, flow distribution correlations obtained from the two-row/four-pass configuration predicted the two-row/six-pass configuration data reasonably well.

摘要

R-134a 在具有两排/六通道配置的蒸发器中的分布进行了实验研究，入口质量为 0.2，出口过热度为 5°C。质量通量从 63 kg/m ² s 变化到 117 kg/m ² s。流量分布总体符合预期趋势。刀片配置（多孔或单个矩形孔）仅影响几乎通过。此外，单个矩形孔插入件获得了更好的液体分布。管突出深度的影响仅在第一次通过时显着。因此，从两排/四通道配置获得的流量分布相关性可以很好地预测两排/六通道配置数据。