Estimation of a Boiling Curve of a Miniaturization Boiling Phenomenon and its Critical Heat Flux

小型化沸腾现象的沸腾曲线及其临界热通量的估计

• 批准号: 08044119
• 负责人: INADA Shigeaki
• 金额: $ 3.58万
• 依托单位: Gunma University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for international Scientific Research
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08044119/
• 关键词: Miniaturization Boiling; Critical Heat Flux; Intermittent Liquid-Solid Contact; Intermittent Liquid-Liquid Contact; Self-Induced Effect; 自己倍力作用; 微細化現象; 沸騰曲線; 沸騰機構; 固液接触

This paper concerns with augmentation of liquid-solid contact in two boiling phenomena : minute bubble emission boiling and miniaturization boiling. In the former, vapor phase generated on a heating surface, instead of covering the surface, appear in many minute-size vapor bubbles ejecting into subcooled liquid, in a subcooled pool boiling. In the latter, however, a liquid volume, upon its impingement upon a heating surface, produces numerous minute-size droplets dispersing into the atmosphere, referred to as liquid droplet boiling. Enhancements in liquid-solid contact are achieved through disturbances due to the ejection of minute bubbles and dispersion of minute droplets which are measured by means of the void probe and piezoelectric potential methods, respectively. The periods of bubble ejection and droplet dispersion are compared. In the miniaturization boiling case, the timewise variation of heating surface temperature is monitored using thermocouples that are spot-welded undernea … More th the heating surface, from which the timewise average surface temperature and heat flux during miniaturization process are evaluated and compared with steady-state pool boiling curve of the minute bubble emission boiling process. Transient behavior during miniaturization boiling is graphically illustrated by means of image processing method and the dispersion strength of liquid droplets is determined from this figure. To help clarify the mechanism of the miniaturization, experiments were conducted in the present study on the reaction of molten metal and water. Molten tin was dropped on a water membrane above a quartz lens, so the behavior could be captured using the holographic interferometry from behind the quartz lens. In particular, the existence of the minute vapor bubble at the interface between the molten metal and the water membrane and the process by which it breaks was visualized in real time.It is concluded from a comparison based on these measured results that the two miniaturized boiling phenomena occur at the same threshold temperature, in the range of about 180 to 210ﾟC with miniaturization taking place under the same mechanism. This report is consists of six parts. Less

本文研究了微小气泡喷射沸腾和微小化沸腾两种沸腾现象中的液固接触强化。在前者中，在加热表面上产生的蒸汽相，而不是覆盖表面，出现在许多微小尺寸的汽泡喷射到过冷液体中，在过冷池沸腾中。然而，在后者中，液体体积在其撞击在加热表面上时产生许多微小尺寸的液滴分散到大气中，称为液滴沸腾。液-固接触的增强是通过由于微小气泡的喷射和微小液滴的分散而引起的扰动来实现的，所述微小气泡的喷射和微小液滴的分散分别通过空隙探针和压电电势方法来测量。比较了气泡喷射和液滴分散的周期。在小型化沸腾的情况下，加热表面温度随时间的变化是监测使用热电偶是点焊在nea ...更多信息 计算了微小气泡喷射沸腾过程的时均表面温度和热流密度，并与微小气泡喷射沸腾过程的稳态池沸腾曲线进行了比较。本文用图象处理方法图解了小型化沸腾过程中的瞬态行为，并由此确定了液滴的分散强度。为了阐明微型化的机理，在本研究中进行了熔融金属和水的反应的实验。熔融锡滴在石英透镜上方的水膜上，因此可以使用全息干涉术从石英透镜后面捕获行为。特别是在真实的时间内观测到了金属液与水膜界面处微小汽泡的存在及其破裂过程，并根据这些测量结果进行了比较，得出结论：这两种小型化沸腾现象发生在相同的阈值温度（约为180 ~ 210 ℃），小型化发生的机理相同。本报告共分六个部分。少

项目成果

Shigeaki Inada and Wen-Jei Yang: "A Study on Miniaturization Boiling Phenomena" 11th-Intenational Heat Transfer Conference, at Kyongju, August 23-28. (1998)

Shigeaki Inada 和 Wen-Jei Yang：“小型化沸腾现象的研究”第 11 届国际传热会议，8 月 23 日至 28 日在庆州举行。

稲田茂昭: "液・液直接接触沸騰時の伝熱特性" 日本機械学会第74期全国大会講演論文集(III). No.96-15. 399-400 (1996)

Shigeaki Inada：“液-液直接接触沸腾时的传热特性”第74届日本机械工程学会全国会议论文集（III）第96-15号（1996年）。

Shigeaki INADA: "Heat Flow Visualization and Characteristics During Liquid-Liquid Direct-Contact Pool Boiling" The first Pacific Symposium on Flow Visualization and Image Processing. Vol.2. 475-478 (1997)

Shigeaki INADA：“液-液直接接触池沸腾期间的热流可视化和特征”第一届太平洋流动可视化和图像处理研讨会。

Shigeaki Inada and Wen-Jei Yang,: "A Study on Miniaturization Boiling Phenomena" 11th-International Heat Transfer Conference,at Kyogju,Agust 23-28. (1998)

Shigeaki Inada 和 Wen-Jei Yang，：“小型化沸腾现象的研究”第 11 届国际传热会议，8 月 23-28 日在京州举行。

Shigeaki Inada and Wen-Jei Yang: "A Study on Miniaturization Boiling Phenomena" 11th-International Heat Transfer Conference, at Kyongju, August 23-28. (1998)

Shigeaki Inada 和 Wen-Jei Yang：“小型化沸腾现象的研究”第 11 届国际传热会议，8 月 23 日至 28 日在庆州举行。