Abstract The numerical investigation of the effect of the swirl number and the thermophysical properties of water, ethanol, and acetone droplets on the particle scattering, turbulence modification and heat transfer in a droplet-laden flow is carried out. The set of 3D steady-state Reynolds-averaged Navier–Stokes (RANS) equations for the two-phase flow is utilized. The dispersed phase is modeled by the Eulerian approach. The flow swirling significantly shortens the length of the recirculation zone (up to two times in comparison with non-swirling flow at swirl number S = 0.5) for all types of the studied liquids. The highest value of heat transfer rate is obtained for the ethanol droplets (up to 10%), and the lowest one is obtained for the acetone droplets (up to 50%), both in comparison with water droplets. The swirling of the turbulent mist flow causes heat transfer enhancement (more than 1.5 times in comparison with the non-swirling droplet-laden flow). In the swirling flow, the value of the volume fraction of the dispersed phase has a maximum in the axial region of the pipe, and further in the direction of the wall its value is very small. The effect of heat transfer enhancement weakens with increasing Reynolds number of the flow. A region without droplets appears in the wall zone of the swirling two-phase flow, and the region is largest for acetone droplets.

中文翻译：

---

液滴热物理特性对旋流分离雾流中湍流传热的影响

摘要 对水、乙醇和丙酮液滴的旋流数和热物理性质对液滴负载流中粒子散射、湍流修正和传热的影响进行了数值研究。利用了用于两相流的一组 3D 稳态雷诺平均纳维 - 斯托克斯 (RANS) 方程。分散相通过欧拉方法建模。对于所有类型的研究液体，流动涡流显着缩短了再循环区的长度（与涡流数 S = 0.5 的非涡流相比，最多缩短了两倍）。与水滴相比，乙醇液滴的传热率最高（高达 10%），丙酮液滴的传热率最低（高达 50%）。湍流雾流的旋流导致传热增强（与非旋流载有液滴的流相比，传热增强了 1.5 倍以上）。在旋流中，分散相的体积分数值在管的轴向区域最大，进一步在壁方向上它的值很小。传热增强的效果随着流动雷诺数的增加而减弱。旋流两相流的壁区出现一个没有液滴的区域，其中丙酮液滴的区域最大。在墙的方向上，它的值非常小。传热增强的效果随着流动雷诺数的增加而减弱。旋流两相流的壁区出现一个没有液滴的区域，其中丙酮液滴的区域最大。在墙的方向上，它的值非常小。传热增强的效果随着流动雷诺数的增加而减弱。旋流两相流的壁区出现一个没有液滴的区域，其中丙酮液滴的区域最大。