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首页> 外文期刊>International Journal of Heat and Mass Transfer >Numerical investigation of heat and mass transfer from an evaporating meniscus in a heated open groove
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Numerical investigation of heat and mass transfer from an evaporating meniscus in a heated open groove

机译：加热的开放槽中蒸发弯月面传热和传质的数值研究

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摘要

The process of evaporation from a meniscus into air is more complicated than in enclosed chambers filled with pure vapor. The vapor pressure at the liquid-gas interface depends on both of the evaporation and the vapor transport in the gas environment. Heat and mass transport from an evaporating meniscus in an open heated V-groove is numerically investigated and the results are compared to experiments. The evaporation is coupled to the vapor transport in the gas domain. Conjugate heat transfer is considered in the solid walls, and the liquid and gas domains. The flow induced in the liquid due to Marangoni effects, as well as natural convection in the gas due to thermal expansivity and vapor concentration gradients are simulated. The calculated evaporation rates are found to agree reasonably well with experimentally measured values. The convection in the gas domain has a significant influence on the overall heat transfer and the wall temperature distribution. The evaporation rate near the contact lines on either end of the meniscus is high. Heat transfer through the thin liquid film near the heated wall is found to be very efficient. A small temperature valley is obtained at the contact line which is consistent with the experimental observation.
机译：从弯月面蒸发到空气中的过程比在充满纯蒸气的密闭腔室中要复杂得多。液-气界面处的蒸气压取决于气体环境中的蒸发和蒸气传输。数值研究了开放式加热V型槽中蒸发弯月面的热量和质量传递，并将结果与​​实验进行了比较。蒸发与气体域中的蒸气传输耦合。在固体壁，液体和气体域中考虑了共轭传热。模拟了由于Marangoni效应在液体中引起的流动，以及由于热膨胀率和蒸气浓度梯度而在气体中产生的自然对流。发现计算出的蒸发速率与实验测量值相当吻合。气体域中的对流对整体传热和壁温分布有重大影响。在弯液面两端接触线附近的蒸发速率很高。发现通过加热壁附近的液体薄膜的热传递是非常有效的。在接触线上获得一个小的温度谷，这与实验观察结果一致。

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