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Turbulence Behavior below an Gas-Liquid Interface and Effects of Interfacial Waves in a Horizontal Stratified Flow.

气液界面下方的湍流行为以及水平分层流中界面波的影响。

基本信息

批准号：
03452127
负责人：
SAITO Takamoto
金额：
$ 4.35万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-03452127/
关键词：
Gas-Liquid Two-Phase Flow Stratified Flow k-epsilon Model Turbulence Model Interfacial Waves Condensation Surface Renewal Model 分離流 kーεモデル

项目摘要

Momentum transfer across an air-water interface was studied in a horizontal stratified flow through experimental and numerical analysis. When the liquid Reynolds number equaled to 1200, the smooth interface behaved similar to a solid wall, while the wavy interface behaved different from a solid wall. When the Reynolds number was 11500, turbulence near the interface was completely different from the wall turbulence. In numerical analysis, the k-epsilon model was modified to satisfy asymptotic behavior of turbulent energy, dissipation rate and Reynolds stress to the interface. The modified k-epsilon model could quantitatively predict the turbulence behavior below the smooth interface.Heat transfer by direct contact condensation at a steam-subcooled water interface was investigated in a horizontal rectangular channel. Three types of models were used to predict the heat transfer coefficients at the interface. The heat conduction model provided the lowest limit of heat transfer. The modified K-epsilon model, which could simulate the near-interface variation of the turbulence quantities, showed the more improved prediction compared with the wall k-epsilon model and agrees with the experimental results with smooth interfaces. The condensation heat transfer with interfacial waves were predicted qualitatively by introducing the interfacial wave effect into the surface renewal model.

通过实验和数值分析，研究了水平分层流中气水界面动量传递问题。当液体雷诺数为1200时，光滑界面表现出与固体壁面相似的特性，而波状界面表现出与固体壁面不同的特性。当雷诺数为11500时，界面附近的湍流与壁面湍流完全不同。在数值分析中，对k-ε模型进行了修正，使之满足湍流能量、耗散率和雷诺应力对界面的渐近行为。采用修正的k-S模型对光滑界面下的湍流行为进行了定量预测，研究了水平矩形通道内蒸汽-过冷水界面直接接触凝结换热。三种类型的模型被用来预测在界面处的传热系数。热传导模型提供了传热的最低限度。修正后的K-S模型能较好地模拟近界面湍流量的变化，与壁面K-S模型相比，修正后的K-S模型对近界面湍流量的预测有较大的改善，在光滑界面条件下，修正后的K-S模型与实验结果吻合较好。将界面波效应引入到表面更新模型中，定性地预测了界面波作用下的凝结换热。