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首页> 外文期刊>International Journal of Heat and Fluid Flow >Heat transfer mechanisms in vapor mushroom region of saturated nucleate pool boiling
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Heat transfer mechanisms in vapor mushroom region of saturated nucleate pool boiling

机译：饱和成核池沸腾蒸气蘑菇区的传热机理

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摘要

To reveal the highly efficient heat transfer mechanisms in the vapor mushroom region of saturated nucleate pool boiling, a new model was developed in which three heat transfer mechanisms were considered: the conduction and evaporation in the microlayer region underneath vapor stem, the conduction and evaporation in the macrolayer region between the vapor mushroom and the heater surface and Marangoni convection in the macrolayer region. Two-dimensional conservation equations for laminar flow in the macrolayer region and conduction in the heater were solved. The SIMPLE-algorithm was used for handling the pressure-velocity coupling. Calculated boiling curve agrees well with the published experimental data and numerical results showed that about 60% heat flux is transferred by evaporation in the microlayer region, and about 40% heat flux is evaporated at the vapor-liquid interfaces of the macrolayer due to both the conduction and Marangoni convection heat transfer in the macrolayer region. Further investigations were also carried out for the cases in which only one or two heat transfer mechanisms were considered to assess the relative influences of the microlayer evaporation and Marangoni convection.
机译：为了揭示饱和核池沸腾的蒸气蘑菇区中的高效传热机理，建立了一个新模型，其中考虑了三种传热机理：在蒸气茎下的微层区中的传导和蒸发，在蒸发器下方的微层区中的传导和蒸发。蒸汽蘑菇和加热器表面之间的宏观层区域以及宏观层区域中的Marangoni对流。求解了宏观层中层流和加热器中的传导的二维守恒方程。 SIMPLE算法用于处理压力-速度耦合。计算出的沸腾曲线与已发表的实验数据吻合得很好，数值结果表明，约有60％的热通量通过蒸发在微层区域转移，而约40％的热通量在大分子层的气液界面处蒸发，这是由于两者的共同作用。大层区域的热传导和Marangoni对流换热。对于仅考虑一种或两种传热机制来评估微层蒸发和Marangoni对流的相对影响的情况，还进行了进一步的研究。

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