ABSTRACT

Flow boiling heat transfer is a promising technology for thermal management. In this paper, flow boiling heat transfer characteristics in a rectangular vertical flow channel are experimentally and numerically investigated at low flow rate. Visualization results provide guidance for the prediction of flow patterns. The flow boiling correlation at low flow rates is improved with an error of less than 30%. Numerical results reveal vortices enhanced local heat transfer. Absolute vorticity is introduced to quantify the secondary flow. The results indicate that the secondary flow intensity increases with heat flux, verifying that boiling flow produces the local convection enhancement.

摘要

流动沸腾传热是一种很有前途的热管理技术。在本文中，实验和数值研究了低流速下矩形垂直流道中的流动沸腾传热特性。可视化结果为流动模式的预测提供指导。低流速下的流动沸腾相关性得到改善，误差小于 30%。数值结果表明涡流增强了局部传热。引入绝对涡量来量化二次流。结果表明，二次流强度随热通量增加而增加，证实沸腾流产生局部对流增强。