Parametric analysis of interfacial friction factor for liquid film dynamics sheared by turbulent gas flow
Parametric analysis of interfacial friction factor for liquid film dynamics sheared by turbulent gas flow
复制标题
DOI：
10.38036/jgpp.13.3_1
复制
发表时间：
2022-11
影响因子：
--
通讯作者：
T. Inoue;Y. Kamada;C. Inoue;Zhenying Wang
中科院分区：
文献类型：
--
作者：
T. Inoue;Y. Kamada;C. Inoue;Zhenying Wang
水滴冲击低压涡轮机叶片引起的冲蚀磨损是一个重要问题。这是必要的，以阐明一个全面的液滴脱离机制，不仅从后缘，但也从液膜表面。本文研究了管流和板流条件下，界面摩擦系数对湍流气体剪切下壁面液膜动力学的影响，包括液膜厚度、液膜速度和液膜脱落液滴。我们进行分析，使用液膜动力学模型，最近建立的，考虑到三维不稳定波和液滴夹带从液体表面。结果表明，油膜厚度和速度在很大程度上取决于界面摩擦系数。有趣的是，当界面摩擦系数等于液膜雷诺数的倒数时，液滴被夹带到初始液膜中的速率最小，而剩余液膜的流量最大。
Water droplet impingement on a low-pressure steam turbine blade causing erosion has been recognized as a crucial issue. It is essential to elucidate a comprehensive droplet detachment mechanism, not only from the trailing edge but also from the liquid film surface. In the present paper, we investigate the influence of interfacial friction factor against liquid film dynamics on a wall sheared by a turbulent gas flow, including the liquid film thickness, liquid film velocity and entrained droplet detached from liquid surface for both pipe flow and plate flow conditions. We conduct the analyses by using a liquid film dynamics model, recently established, considering the three-dimensional destabilized waves and droplet entrainment from the liquid surface. As a result, the film thickness and velocity greatly depends on the interfacial friction factor. Interestingly, the rate of entrained droplet to initial liquid film has a minimum value when the interfacial friction factor equals to the inverse of the liquid film Reynolds number, while the remaining liquid film flow rate becomes maximum.