LTE和LTNE条件下多孔竖直加热壁的膜态沸腾研究
首发时间:2021-02-23
摘要:在局部热平衡(LTE)和局部非热平衡(LTNE)假设下,分析了覆盖多孔介质竖直加热壁面上膜态沸腾传热。结合Darcy-Brinkman模型以及单能量方程或双能量方程建立了数学模型,分析得到了气膜厚度,温度分布以及换热系数分布。得到了LTE模型的近似解。在 数高于 时,局部非热平衡模型计算结果与局部热平衡一致,可认为此时达到热平衡状态。 数越大,气膜厚度越大,换热系数越大。
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Analysis of Film Boiling on a vertical plate imbedded in porous media under LTE and LTNE conditions
Abstract:Film boiling heat transfer over a vertical heating wall covered with porous media was analyzed, with the local thermal equilibrium (LTE) and local thermal non-equilibrium (LTNE) assumptions. The mathematical model is established based on Darcy-Brinkman model and the one-equation equilibrium model or the two-equation non-equilibrium model. The film thickness, temperature distribution and heat transfer coefficient distribution are analysed. An approximate solution is obtained under the LTE assumption. While is higher than , the calculation results of the LTNE model are consistent with the LTE model, which is considered as thermal equilibrium. As the number increases, the film thickness increases and the evaporation heat transfer coefficient increases.
Keywords: film boiling porous medium the local thermal equilibrium the local thermal non-equilibrium
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LTE和LTNE条件下多孔竖直加热壁的膜态沸腾研究
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