A RESEARCH ON RAPID EVAPORATION OF THE MICRO BUBBLE AND ITS INJECTION-COLLAPSE BEHAVIOR

微气泡快速蒸发及其注射塌陷行为的研究

基本信息

批准号：
11650207
负责人：
INADA Shigeaki
金额：
$ 2.3万
依托单位：
Gunma University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650207/
关键词：
Micro Bubble Miniaturization Phenomenon Collapse of Vapor Film Liquid-Solid Contact Transparent Solid Surface Drop Impinging Boiling Minute Droplet Scatter Back Photographing 微小液粒子の急速飛散固液接触沸騰挙動石英加熱面乾燥斑点数衝突液滴背面撮影ポログラフィ干渉法

项目摘要

The purpose of this study is to clarify the miniaturization phenomenon in which large number of minute droplets intensely scatters to the atmosphere, when the droplet collided on the heating surface. Especially, the generation behavior of the minute bubble(micro bubble), which arose, when the liquid-solid contact occurred by a collapse of the thin vapor film formed between the heating surface and the droplet, was caught for the elucidation of the minituarization mechanism. In quartz heating surface used until now, the nucleate boiling behavior continued to the high-temperature range, and the dispersion phenomena of the intense and minute droplets could not be remarkably recognized. Then, sapphire disk of which thermal conductivity is good, ITO(Indium Tin Oxide)film plane which thinly spattered conductive film to the glass plane and the plane which thinly spattered chromium coating on the quartz plane were used as a heating surface. Boiling behavior on each plane was caught by high-speed camera from each back surface, and it was compared with the quartz plane. Evaporation lifetime property of the nucleate boiling condition(boiling of the condition in which heating surface and liquid film sufficiently got wet)on the ITO film plane and the chromium coating plane is similar to the data in the quartz plane. The lifetime property on the sapphire closs to the lifetime for metal surface. The part of divided droplet would contact with heating surface through the thin vapor film, when the temperature of the chromium coating plane exceeds 450°C.At this time, it could be confirmed that the dispersion of the explosive minute liquid particle was generated. It was proven that the result of inducing this explosive dispersion was a micro bubble.

这项研究的目的是阐明微型化现象，其中当液滴在加热表面上碰撞时，大量的微小液滴会密切散落到大气中。特别是，当液态固体接触发生在加热表面和液滴之间形成的薄蒸气膜的崩溃时，会产生的微小气泡（微气泡）的产生行为，以阐明微型化机制。到目前为止，在石英加热表面中，核沸腾行为持续到高温范围，而浓烈和微小液滴的分散现象无法得到明显的认可。然后，蓝宝石磁盘的热导率很好，ITO（Indium Tin氧化物）膜平面将稍微间隔的膜稍微传导到玻璃平面上，而在石英平面上略微间隔的铬涂层的平面则用作加热表面。每个平面上的沸腾行为被每个背面的高速摄像头捕获，并与石英平面进行了比较。核沸腾条件的蒸发寿命特性（在ITO膜平面上加热表面和液体膜充分湿润的条件的沸腾和铬涂料平面的沸腾性与石英平面中的数据相似。金属表面的蓝宝石布上的终身特性。当铬涂层的温度超过450°C时，分开的液滴的一部分将通过薄蒸气膜与加热表面接触。这次，可以证实产生了爆炸性分钟液体颗粒的分散体。事实证明，这种爆炸性分散剂的结果是微气泡。