Growth characteristics of microlayer at bottom of boiling bubble on hydrophobic heating surface

doi:10.11949/0438-1157.20200489

Abstract

Abstract:

The laser interferometric method and high-speed camera technology are combined to study the dynamic characteristics of a single ethanol bubble generated by the hydrophobic ITO heating surface, and to study the microlayer at the bottom of the bubble. The process of bubble growth and detachment was compared and analyzed with previous hydrophilic heating surface experiments. In this experiment, two high-speed cameras were used at the same time: one recorded the interference fringes of microlayer at the bottom of the bubble, and the other recorded the growth and detachment images of the single bubble from the side view. By comparing these images frame by frame and comparing with the hydrophilic heating surface experiment, it is found that the growth period of the hydrophobic surface bubble has no waiting period, and the time of the detachment period is much longer than the growth period, the microlayer at the bottom of the bubble is unstable and random slip occurs during the growth and detachment process of the bubble.

Key words: bubble, phase change, evaporation, microlayer, hydrophobic surface, interferometric method

摘要：

将激光干涉法和高速摄像技术相结合，研究了疏水ITO加热表面生成的单个乙醇气泡的动态特性，观测研究了其底部的微液层，并与之前的亲水加热表面的气泡生长脱离过程进行对比分析。本实验同时使用两台高速摄像机：一台记录气泡底部微液层干涉条纹，另一台从侧面同步记录单个气泡的生长和脱离图像。通过对这些图像逐帧比较，并与亲水表面的气泡生长过程对比后，发现疏水表面气泡的生长周期没有等待期，且脱离期时间远大于生长期，气泡底部的微液层存在形态不稳定，气泡在生长和脱离过程中会发生随机滑移现象。

关键词: 气泡, 相变, 蒸发, 微液层, 疏水表面, 激光干涉法

CLC Number:

TK 121

Ming GAO, Qirong ZUO, Lingshuang ZHANG, Da ZHANG, Lixin ZHANG. Growth characteristics of microlayer at bottom of boiling bubble on hydrophobic heating surface[J]. CIESC Journal, 2020, 71(S2): 46-54.

高明, 左启蓉, 张凌霜, 张达, 章立新. 疏水表面沸腾气泡底部微液层生长特性[J]. 化工学报, 2020, 71(S2): 46-54.

Figures/Tables 10

Fig.1 Schematic diagram of nuclear boiling bubble and principle of laser interference

Fig.2 Experimental system

Fig.3 Interference fringes of microlayer on hydrophobic surface

Fig.4 Comparison of side photos of bubble

Fig.5 Growth time, departure time and growth period of bubble at different heat flux

Fig.6 Comparison of interference fringes in microlayer beneath bubble

Fig.7 Pattern of interference fringe under different heat flux density

Fig.8 Schematic diagram of microlayer corresponding to different interference fringes (left: bubble; right: microlayer)

Fig.9 Interference fringe images (left) and synchronous bubble growth and departure photos (right)(heat flux=25.7 kW/m2)

Fig.10 Interference image of bubble slip at heat flux of 66.1 kW/m2

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