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首页> 外文期刊>International Journal of Heat and Mass Transfer >An investigation on dynamic thickness of a boiling liquid film
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An investigation on dynamic thickness of a boiling liquid film

机译：沸腾液膜动态厚度的研究

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Motivated by understanding the micro-hydrodynamics of boiling heat transfer and the mechanism of critical heat flux (CHF) occurrence, the present study is to investigate the boiling phenomenon in a liquid film whose dynamic thickness is recorded by a confocal optical sensor with the measurement accuracy of micrometres, while the bubble dynamics of the boiling in the film is visualized by a high-speed photography. This paper is focused on a statistical analysis of the measured thickness signals for the boiling condition ranging from low heat flux to high heat flux (near or at CHF). The dynamic thickness of liquid film appears oscillating with peak values, resulting from the liquid film movements due to nucleation of bub-ble(s) and its growth and rupture. The statistical analysis in a certain period indicates there emerge three distinct liquid film thickness ranges: 0-50 μm, 50-500 urn and 500-2500 μm, seemingly corresponding to the microlayer, macrolayer and bulk layer. With increasing heat flux to a specific extent, the bulk layer disappears, and then the macrolayer gradually decreases to ～105 μm, beyond which the liquid film may lose its integrity and CHF occurs at 1.563 MW/m~2.
机译：通过了解沸腾传热的微观流体力学和临界热通量（CHF）发生的机理，本研究旨在研究通过共焦光学传感器记录动态厚度的液膜的沸腾现象，并具有测量精度薄膜的沸腾气泡动力学可以通过高速摄影看到。本文着重于对从低热通量到高热通量（接近或处于CHF）的沸腾条件下测得的厚度信号的统计分析。液体膜的动态厚度似乎随着峰值而振荡，这是由于气泡成核及其生长和破裂而引起的液体膜运动的结果。一定时期内的统计分析表明，出现了三个不同的液膜厚度范围：0-50μm，50-500 um和500-2500μm，似乎对应于微层，大分子层和整体层。随着热通量的增加，本体层消失，然后宏观层逐渐减小至〜105μm，超过此范围液膜可能失去完整性，CHF发生在1.563 MW / m〜2。

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