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首页> 外文期刊>International Journal of Heat and Mass Transfer >Numerical simulation of heat transfer and determination of critical heat fluxes at nonsteady heat generation in falling wavy liquid films
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Numerical simulation of heat transfer and determination of critical heat fluxes at nonsteady heat generation in falling wavy liquid films

机译：下降波状液膜传热的数值模拟及非稳态生热临界热通量的确定

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摘要

In the current work, we present the mathematical model, which allows the calculation of the wave surface profile, velocity and temperature fields as well as the study of their evolution at a drastic change in heat loads with time. This model allows calculations of the wave characteristics and parameters of liquid film decay at different regime parameters. Using the presented model, we have simulated the wave formation process in falling film of liquid nitrogen and retrieved the resulting average wave characteristics for different inlet Reynolds numbers. We have also calculated the dependencies of boiling expectation time and total local evaporation time in falling wavy films of liquid nitrogen on heat flux density for different inlet Reynolds numbers. It was found out that all calculated dependencies are approximately similar in the area of high heat flux rates for all examined inlet Reynolds numbers indicating the weak influence of irrigation rate on boiling expectation time in this range of heat loads. Discrepancy of calculated dependencies was found in the area of low heat flux rates, what could be explained by significant influence of evaporation on heat transfer under such conditions. The dependencies of characteristic heat flux density of boiling suppression and total local evaporation suppression on the inlet Reynolds number were also presented. The regime map, which defines the different mechanisms of decay of falling wavy film of liquid nitrogen, was obtained by summing up the results of numerical simulation. The results of numerical simulations are in satisfactory agreement with experimental data.
机译：在当前的工作中，我们提出了数学模型，该模型允许计算波表面轮廓，速度和温度场，以及研究在热负荷随时间急剧变化的情况下其演化。该模型允许计算在不同状态参数下的波特性和液膜衰减参数。使用提出的模型，我们模拟了液氮降膜中的波形成过程，并针对不同的入口雷诺数检索了所得的平均波特性。我们还计算了不同进口雷诺数下液氮下降的波浪状薄膜中沸腾预期时间和总局部蒸发时间的关系。结果发现，对于所有检查的入口雷诺数，所有计算出的相关性在高热通量区域内都近似相似，这表明在此热负荷范围内，灌溉速度对沸腾预期时间的影响很小。在低热通量区域发现了计算依赖性的差异，这可以通过在这种条件下蒸发对热传递的显着影响来解释。还给出了沸腾抑制特征热通量密度和总局部蒸发抑制特征对进口雷诺数的依赖性。通过总结数值模拟的结果，获得了定义液态氮下降的波浪膜衰减的不同机理的状态图。数值模拟的结果与实验数据令人满意。

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