Liquid-vapor separation process is a widely used process in many industrial and domestic applications. Liquid-separation condenser using header-orifice as liquid-vapor separator has been widely studied, confirming its superiority of higher heat transfer coefficient and lower pressure drop simultaneously over the conventional condenser. However, research on flow and separation mechanism of the header-orifice liquid-vapor separator is rarely found in existing literatures. Herein, we propose a numerical simulation model based on Volume of Fluid for the header-orifice liquid-vapor separator. The model is verified and applied to study the liquid-vapor separation mechanism of the header-orifice. The major parameters that influence the liquid-separation efficiency are analyzed, including the diameter of a liquid-separation hole, header height and inlet mass flow rate. Multi-factor analysis is also performed to investigate the synergetic effects of the parameters on the liquid-separation efficiency. A correlation of liquid-separation efficiency as a function of cross-section area, two-phase Reynolds number, and modified Weber number is obtained based on the orthogonal experimental method.

液体-蒸气分离过程是许多工业和家庭应用中广泛使用的过程。使用集管孔作为液体-蒸气分离器的液体分离冷凝器已经得到了广泛的研究，证实了与传统冷凝器同时具有更高的传热系数和更低的压降优势。然而，在现有文献中很少发现对集管孔液体-蒸气分离器的流动和分离机理的研究。在此，我们针对集流孔液汽分离器提出了一种基于流体体积的数值模拟模型。对该模型进行了验证，并用于研究集管孔的汽液分离机理。分析了影响分液效率的主要参数，包括分液孔的直径，集管高度和入口质量流速。还进行了多因素分析，以研究参数对液体分离效率的协同作用。基于正交实验方法，获得了液体分离效率与横截面积，两相雷诺数和修正的韦伯数的关系。