The objective of this work is to study the flow behavior and oil film thickness in the vertical helical channel to improve the efficient operation of the single screw expander. The volume-of-fluid (VOF) model is adopted to examine various effects, including flow direction, oil viscosity, surface tension, flow rate, and oil inlet width on the liquid film thickness distribution and liquid holdup. An interesting phenomenon is found that the gas axial velocity is accelerated in the flow, and this has a profound influence on the liquid film thickness distribution and liquid holdup. The liquid film thickness exhibits a significant improvement as the downward flow is considered. The liquid film thickness becomes more symmetrical with increasing the oil viscosity, surface tension, oil flow rate, and inlet width, and more liquid are concentrated at the two endpoints of the channel. A higher viscosity oil or larger surface tension coefficient will result in a higher liquid holdup. These results and analysis are crucial for improving the performance of single screw expanders.

这项工作的目的是研究垂直螺旋通道中的流动行为和油膜厚度，以提高单螺杆膨胀机的高效运行。采用流体体积 (VOF) 模型来检验各种影响，包括流动方向、油液粘度、表面张力、流速和进油口宽度对液膜厚度分布和持液率的影响。发现一个有趣的现象，气体轴向速度在流动中加速，这对液膜厚度分布和持液率有深远的影响。当考虑向下流动时，液膜厚度表现出显着改善。随着油液粘度、表面张力、油液流速和入口宽度的增加，液膜厚度变得更加对称，并且更多的液体集中在通道的两个端点。较高粘度的油或较大的表面张力系数将导致较高的液体滞留量。这些结果和分析对于提高单螺杆膨胀机的性能至关重要。