【作者】 任川； 吴清松；

【Author】 Ren Chuan, Wu Qing-song(Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei 230026, China)

【机构】 中国科学技术大学热科学和能源工程系；

【摘要】 蒸发器是环路热管(LHP)中最重要的部件,蒸发器主芯中的流场是设计中最受关注的地方。工质在主芯中的流动是一个在毛细多孔介质中伴随有移动相界面的非等温渗流问题。本文建立了一个二维数学模型来模拟流体工质在主芯中的渗流、传热和蒸发的现象,以部分揭示主芯中流体工质的动力学和热力学行为。模型包括流场模拟和移动相界面追踪两部分,流场模拟是全区域统一处理的,而移动相界面的追踪是局部的。通过引入广义的Darcy定律代替渗流的动量方程,最终得到两个全场求解的控制方程:连续性方程演化的压力方程和能量方程演化的焓方程。毛细压力作为附加源项出现在广义的Darcy定律中,蒸发潜热被自然地包含在比焓中。文中对不同工作条件下的流场进行了模拟,得到了合理的结果。更多还原

【Abstract】 Evaporator is the most important part of Loop Heat Pipes (LHP) and the flow field in its core is the focus of LHP design. Working fluid’s flow in the core can be investigated as the phenomenon of flow in capillary porous media associated with non-homogeneous temperature field and moving phase-interface. A two-dimensional mathematical model is developed to simulate the phenomenon of permeating, heat-transfer and vaporizing in evaporator’s core and to expose the dynamic and thermal behavior behind the phenomenon. The model includes two parts: global simulation of the flow field and local tracking the moving phase-interface. As using the general Darcy’s law instead of the momentum equation, we get two equations: the pressure equation derived from the continuity equation and the enthalpy equation from the energy equation. The capillary force is solved by introducing a source term in the general Darcy’s law. The latent heat is contained spontaneously in enthalpy. Some numerical results under different working conditions are presented.更多还原