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首页> 外文期刊>Journal of enhanced heat transfer >PASSIVE DIRECTIONAL MOTION OF FLUID DURING BOILING DRIVEN BY SURFACE ASYMMETRY IN A DIELECTRIC FLUID
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PASSIVE DIRECTIONAL MOTION OF FLUID DURING BOILING DRIVEN BY SURFACE ASYMMETRY IN A DIELECTRIC FLUID

机译：介电流体中表面不对称引起的沸腾过程中流体的被动方向性运动

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Passive thermal management is of interest in cooling of electronics and avionics in terrestrial and reduced gravity environments. This paper describes the use of microscale asymmetric surface patterns, or ratchets, to generate preferential fluid motion during phase change. The asymmetric patterns take the form of an array of ratchet structures. Preferentially directed bubble growth is demonstrated for boiling on surfaces with such ratchets augmented with re-entrant cavities to produce nucleation at preferred sites. During pool boiling in FC-72, the asymmetric geometry of microstructures causes bubbles to grow normal to the sloped surface rather than in a vertical direction, resulting in a net motion in a preferential direction. Bubble growth from the re-entrant cavities is studied using high-speed photography and image processing techniques. The concept of self-propulsion is extended to an open-ended channel configuration, wherein high-speed videos that document preferential motion of vapor slugs with velocities in the range of several mm/s are presented. Liquid motion is explained using a semi-empirical force balance.
机译：被动热管理在地面和重力降低的环境中对电子设备和航空电子设备的冷却感兴趣。本文介绍了使用微尺度不对称表面图案或棘齿在相变过程中产生优先的流体运动。不对称图案采取棘轮结构阵列的形式。用这种棘轮增加了凹腔以在优选的位置产生成核作用，证明了在这些表面上沸腾时优先定向的气泡生长。在FC-72中沸腾池期间，微结构的不对称几何形状导致气泡垂直于倾斜表面而不是垂直方向生长，从而导致沿优先方向的净运动。使用高速摄影和图像处理技术研究了凹腔内的气泡生长。自推进的概念扩展到开放式通道配置，其中呈现了以视频记录速度在几毫米/秒范围内的气团的优先运动的高速视频。使用半经验力平衡来说明液体运动。

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