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Study on Transient Liquid Film Flow Caused by Marangoni Effect on a Small Heater

小型加热器上马兰戈尼效应引起的瞬态液膜流研究

基本信息

批准号：
12450084
负责人：
IIDA Yoshihiro
金额：
$ 5.82万
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 (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12450084/
关键词：
Marangoni Effect Transient Liquid Flow Deformation of Liquid Film Small Film Heater Pulse Heating パルス加熱

项目摘要

A thin liquid film on a horizontal solid surface was heated pulsewise from beneath using a small heater. The behaviors of the transient deformation and recovery of the film surface resulting from liquid flow induced by the Marangoni effect were investigated experimentally. The conclusions obtained are as follows :(1) A significant deformation of the liquid film resulting from the rapid flow close to breaking up caused by the Marangoni effect and prompt recovery after the heating were clearly observed on and around the heater by lighting in the direction of the solid surface. As increasing heating power so that the deformation may begin at the heater temperature around the boiling point of the liquid, peculiar mist consisting of ultra-fine particles became to emerge from the thinned liquid surface.(2) The vertical displacement of the local liquid surface, which was measured using a laser focus displacement meter, showed the sequential characteristic stages. At a high heating power or a small initial liquid film thickness, the liquid film broke up on and around the heater. The displaced liquid from the heated region rushed into the next region resulting in the temporal M-shaped spatial distribution of the liquid film surface. The maximum decrease in the liquid film thickness during the deformation was well correlated with the average temperature increase of the liquid in the heated region.

在水平固体表面上的薄液膜被使用小加热器从下面脉冲式地加热。实验研究了由Marangoni效应引起的液膜表面的瞬态变形和回复行为。结果表明：（1）在加热器表面及周围，通过沿固体表面方向的照明，可以清楚地观察到由于Marangoni效应引起的快速流动和加热后的迅速恢复，导致液膜的显著变形。随着加热功率的增加，在液体沸点附近的加热器温度下变形开始，由超细颗粒组成的特殊雾状物从变薄的液体表面出现。(2)用激光聚焦位移计测量了局部液面的垂直位移，结果显示出连续的特征阶段。在高加热功率或小的初始液膜厚度下，液膜在加热器上和加热器周围破裂。从加热区域排出的液体冲向下一个区域，导致液膜表面的时间M形空间分布。在变形过程中的液体膜厚度的最大减少与加热区域中的液体的平均温度增加很好地相关。