BOILING CURVE AND MECHANISMS OF VAPOR GENERATION IN LIQUID-LIQUID DIRECT CONTACT

本研究报告了通过可视化液-液接触行为来澄清沸腾特性如何变好以及是否基于任何机制发生蒸汽产生的结果。在本研究中，进行了四个不同的实验，在第一个实验中，液-液直接接触沸腾是在稳态下通过将熔融合金放入充满水的池中进行的。结果表明，由于沸腾核心不足，传热性能变差，从而使熔铅从抑制水蒸气产生的目的上落到了在水中润湿的平面上，而不是富水面上。在第三个实验中，将熔融锡滴在石英透镜上方的水膜上，因此可以从石英透镜的后面用全息干涉术捕捉到这种行为。通过真实的实时观测微小气泡的存在、喷射和消失，并采用了利用两种液体的界面张力差积极引发Marangoni对流的技术，以激发接触界面可能产生的微气泡的产生。可以猜测，结果是，它可以看到马兰戈尼对流，并且它通过这种对流激活了蒸汽的产生。

This study reports on the results of clarifying how the boiling characteristics became good and whether the vapor generation occurred based on any mechanism by visualizing the liquid- liquid contact behavior. In this study, four different experiments were conducted for the purpose.In the first experiment, the liquid-liquid direct contact boiling was performed at steady state by placing a molten alloy into a pooI filled with water. It was disclosed that heat transfer performance deteriorated due to an insufficiency of the boiling nuclei.Then, the molten lead was made to fall from the aim which restrained the vapor generation on not rich water surface but on the plane which moistens in the water. It became clear that the thin vapor film existed on the interface which moistens in the water.In the third experiments, the molten tin was dropped on a water film above a quartz lens, so the behavior could be captured using the holographic interferometry from behind the quartz lens. The existence of the minute vapor bubbles and its ejection and disappearance were visualized in real time.Finally, it adopted the technique which positively caused the Marangoni convection by interfacial tension difference of two liquids in order to activate the generation of the micro bubble which may arise in the contact interface. It was able to be guessed that as the result, it could visualize the Marangoni convection, and that it activates the generation of the vapor by this convection.