Bubble nucleation and growth on microstructured surfaces under microgravity.

IF 4.4 1区 物理与天体物理 Q1 MULTIDISCIPLINARY SCIENCES
Qiushi Zhang, Dongchuan Mo, Seunghyun Moon, Jiya Janowitz, Dan Ringle, David Mays, Andrew Diddle, Jason Rexroat, Eungkyu Lee, Tengfei Luo
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Abstract

Understanding the dynamics of surface bubble formation and growth on heated surfaces holds significant implications for diverse modern technologies. While such investigations are traditionally confined to terrestrial conditions, the expansion of space exploration and economy necessitates insights into thermal bubble phenomena in microgravity. In this work, we conduct experiments in the International Space Station to study surface bubble nucleation and growth in a microgravity environment and compare the results to those on Earth. Our findings reveal significantly accelerated bubble nucleation and growth rates, outpacing the terrestrial rates by up to ~30 times. Our thermofluidic simulations confirm the role of gravity-induced thermal convective flow, which dissipates heat from the substrate surface and thus influences bubble nucleation. In microgravity, the influence of thermal convective flow diminishes, resulting in localized heat at the substrate surface, which leads to faster temperature rise. This unique condition enables quicker bubble nucleation and growth. Moreover, we highlight the influence of surface microstructure geometries on bubble nucleation. Acting as heat-transfer fins, the geometries of the microstructures influence heat transfer from the substrate to the water. Finer microstructures, which have larger specific surface areas, enhance surface-to-liquid heat transfer and thus reduce the rate of surface temperature rise, leading to slower bubble nucleation. Our experimental and simulation results provide insights into thermal bubble dynamics in microgravity, which may help design thermal management solutions and develop bubble-based sensing technologies.

微重力条件下微结构表面上的气泡成核和生长。
了解受热表面气泡形成和生长的动力学对各种现代技术具有重要意义。虽然此类研究传统上仅限于地面条件,但随着太空探索和经济的发展,有必要深入了解微重力环境下的热气泡现象。在这项工作中,我们在国际空间站进行实验,研究微重力环境下表面气泡的成核和生长,并将结果与地球上的结果进行比较。我们的研究结果表明,气泡的成核和生长速度明显加快,是地球上的30倍。我们的热流体模拟证实了重力诱导的热对流的作用,它能从基底表面散热,从而影响气泡的成核。在微重力条件下,热对流的影响减弱,导致基底表面局部发热,从而加快温度上升。这种独特的条件使得气泡能够更快地成核和生长。此外,我们还强调了表面微结构几何形状对气泡成核的影响。作为热传导翅片,微结构的几何形状会影响从基底到水中的热传导。较细的微结构具有较大的比表面积,可增强表面到液体的传热,从而降低表面温度的上升速度,导致气泡成核速度减慢。我们的实验和模拟结果为微重力环境下的热气泡动力学提供了见解,这可能有助于设计热管理解决方案和开发基于气泡的传感技术。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
npj Microgravity
npj Microgravity Physics and Astronomy-Physics and Astronomy (miscellaneous)
CiteScore
7.30
自引率
7.80%
发文量
50
审稿时长
9 weeks
期刊介绍: A new open access, online-only, multidisciplinary research journal, npj Microgravity is dedicated to publishing the most important scientific advances in the life sciences, physical sciences, and engineering fields that are facilitated by spaceflight and analogue platforms.
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