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首页> 外文期刊>International Journal of Heat and Mass Transfer >Microscale heterogeneous boiling on smooth surfaces—from bubble nucleation to bubble dynamics
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Microscale heterogeneous boiling on smooth surfaces—from bubble nucleation to bubble dynamics

机译：光滑表面上的微小异质沸腾-从气泡成核到气泡动力学

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摘要

In this investigation, boiling incipience and bubble dynamics on a microheater with a geometry of 100 μm x 100 μm fabricated with MEMS technology are evaluated using a high-speed digital camera. For the purpose of comparison with conventional boiling heat transfer, boiling incipience and bubble dynamics are also studied on a carefully selected microheater with a fabricated defect (i.e., a microcavity on the heater surface). Of industrial interest are the effects of dissolved gases on boiling incipience and bubble dynamics, which are also discussed in detail. The possible nucleation temperature (or incipience temperature) is analyzed and discussed from the perspective of the measured bulk temperature of the microheater and a 3D heat conduction numerical model. The time-resolved bubble dynamics (i.e., the bubble size evolution, interface velocity and interface acceleration) are all presented along with high-speed digital images. Based upon this investigation, it is clear that explosive boiling can take place on a smooth surface no matter how slow the heating rate, and dissolved gases have a significant influence on the incipience temperature and bubble behavior. Furthermore, this study illustrates that the classical kinetics of boiling can explain the explosive boiling occurring on a smooth surface in principle and can provide a useful guide for the design of microscale heat transfer and/or MEMS devices. Although unexpected, due to the gravitational effects, Marangoni flow on the vapor-liquid interface induced by the temperature gradient was also observed.
机译：在这项研究中，使用高速数码相机评估了采用MEMS技术制造的几何尺寸为100μmx 100μm的微型加热器上的沸腾开始和气泡动力学。为了与常规沸腾传热进行比较，还在精心挑选的具有制造缺陷（即，加热器表面上的微腔）的微型加热器上研究了沸腾初期和气泡动力学。工业上感兴趣的是溶解气体对沸腾初期和气泡动力学的影响，对此也进行了详细讨论。从测得的微型加热器的体温和3D导热数值模型的角度分析和讨论了可能的成核温度（或初始温度）。时间分辨的气泡动力学（即气泡尺寸演变，界面速度和界面加速度）都与高速数字图像一起显示。基于该研究，很明显，不管加热速度有多慢，爆炸的沸腾都可能在光滑的表面上发生，并且溶解的气体对开始温度和气泡行为具有重大影响。此外，这项研究表明，经典的沸腾动力学原理可以从原理上解释发生在光滑表面上的爆炸性沸腾，并且可以为微尺度传热和/或MEMS器件的设计提供有用的指导。尽管出乎意料，但由于重力作用，也观察到了由温度梯度引起的Marangoni在汽-液界面上的流动。

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