Spontaneous nucleation and resulting explosive evaporation of liquid impinging on a hot surface with a high speed

液体高速撞击热表面时发生自发成核并导致爆炸性蒸发

• 批准号: 16560176
• 负责人: OKUYAMA Kunito
• 金额: $ 1.79万
• 依托单位: Yokohama National University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16560176/
• 关键词: Solid-liquid contact; Spontaneous nucleation; Limit of liquid superheat; Rapid evaporation; Contact temperature measurement; Observation of boiling behavior; Surface cooling rate

When a high temperature liquid contacts with a volatile low temperature liquid and the contact interface temperature is beyond the superheat limit of the low temperature liquid, spontaneous nucleation and resulting vapor explosion may occur. In the present study, the contact of liquid with a high temperature solid and the resulting bubble nucleation phenomenon were investigated using a rapid heating method. A small platinum film heater immersed in ethyl alcohol was powered by a rectangular pulse having two or three-stages. The collapse of a coalesced bubble, which is formed as the result of spontaneous nucleation over the heater surface by high pulse of the first stage, causes the solid-liquid re-contact. The pulse power of the second stage was changed in order to control the heater temperature at the contact. The heater surface temperature was measured by means of the resistance thermometry. The third stage of negligible power enabled the surface temperature measurement during the contact. Fine bubbles appeared during the contact and its number becomes maximal when the heater temperature was around the homogeneous nucleation temperature of the liquid. At higher temperatures, the vapor film remained on the entire surface even after the collapse of the coalesced bubble.

当高温液体与挥发性低温液体和接触界面温度的接触超过低温液体的过热极限，可能会发生自发成核和产生的蒸气爆炸。在本研究中，使用快速加热方法研究了液体与高温固体和所得气泡成核现象的接触。浸入乙醇中的小铂膜加热器由具有两个或三个阶段的矩形脉冲提供动力。结合气泡的崩溃是由于第一阶段的高脉冲在加热器表面上自发成核而形成的，这会导致固体液重接触。更改了第二阶段的脉冲功率，以控制接触处的加热器温度。加热器表面温度是通过电阻温度计测量的。可忽略的功率的第三阶段可以在接触过程中进行表面温度测量。在接触过程中出现细气泡，当加热器温度在液体的均匀成核温度附近时，其数量变得最大。在较高的温度下，即使在聚集起泡的气泡崩溃之后，蒸气膜仍保留在整个表面上。

项目成果

高速加熱沸騰と固液接触

快速加热沸腾和固液接触

• 发表时间: 2005
• 期刊: 第42回日本伝熱シンポジウム講演論文集 2
• 作者: 梅田眞三郎;長谷川盛三;Wen-Jei Yang;奥山邦人
• 通讯作者: 奥山邦人

高温固体面への液体の接触と自発核生成

液体与高温固体表面的接触和自发成核

• 发表时间: 2006
• 期刊: 第43回日本伝熱シンポジウム講演論文集 (印刷中)
• 作者: Kito;A.;Sugawara;K.;Yoshikawa;H.;Ota;T.;Makoto TAGO;S.Saitoh;Akira Taniguchi;奥山邦人
• 通讯作者: 奥山邦人

Liquid contact in transient boiling on a solid surface subjected to rapid heating

在快速加热的固体表面上瞬时沸腾的液体接触

• 发表时间: 2005
• 期刊: 42nd National Heat Transfer Symposium of Japan Vol.2
• 作者: Kunito Okuyama

Contact of liquid on a hot surface and resulting behavior of spontaneous nucleation

液体在热表面上的接触以及由此产生的自发成核行为

• 发表时间: 2006
• 期刊: 43rd National Heat Transfer Symposium of Japan (in press)
• 作者: 門脇敏;貫井純一郎;Shinzaburo Umeda;Kunito Okuyama
• 通讯作者: Kunito Okuyama