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A numerical model for transient simulation of porous wicked heat pipes by lattice Boltzmann method

机译：晶格玻尔兹曼方法瞬态模拟多孔芯吸热管的数值模型

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摘要

A numerical model based on an analytical lumped vapor assumption was proposed for highly efficient simulation of transient performances of heat pipes. The wick is modeled as fully thawed porous medium in which both the Darcian and non-Darcian effects are considered. The evaporation and condensation rates of the working substance are calculated locally as a function of not only the liquid-vapor interface temperature but also the vapor state properties by the kinetic theory. The coupled equations for liquid flow and heat conduction in/between components of the heat pipe are solved by a thermal lattice Boltzmann algorithm. Validation of the model is conducted by reproducing representative cases from the literature and then comparing the present results with their experimental and theoretical data. It turns out that both the transient temperature variation and the steady-state temperature and pressure profiles are in accordance with the literature results. The vapor velocity profile inferred from the evaporation rates is also found to be sufficiently accurate, which even gives a more reasonable estimate than the reference in comparison. In order to further improve the simulation efficiency of the code, non-uniform lattice and parallel algorithm are incorporated, based upon which the lumped vapor model achieves a speed over 50 times faster than the plain model with complete vapor consideration. The present model could serve as an efficient tool for quick evaluation of transient heat pipe behaviors and for assisting parametric studies of heat pipes.
机译：提出了一种基于分析性集总蒸汽假设的数值模型，用于高效模拟热管的瞬态性能。芯被建模为完全融化的多孔介质，其中考虑了达西效应和非达西效应。根据动力学理论，不仅根据液-气界面温度而且还根据气态性质来局部计算工作物质的蒸发和冷凝速率。通过热晶格玻尔兹曼算法求解热管各部件之间/之间的液体流动和热传导的耦合方程。通过从文献中复制具有代表性的案例，然后将当前结果与其实验和理论数据进行比较，来进行模型验证。结果表明，瞬态温度变化以及稳态温度和压力曲线均与文献结果一致。还发现由蒸发速率推断出的蒸气速度曲线足够精确，与比较中的参考相比，它甚至给出了更合理的估计。为了进一步提高代码的仿真效率，结合了非均匀点阵和并行算法，在此基础上，考虑到完整的蒸汽，集总蒸汽模型的速度比普通模型快50倍以上。本模型可以用作快速评估瞬态热管行为和辅助热管参数研究的有效工具。

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