An Experimental Characterization of Capillary Driven Flows in Microgravity

IF 1.3 4区 工程技术 Q2 ENGINEERING, AEROSPACE Microgravity Science and Technology Pub Date : 2024-11-04 DOI:10.1007/s12217-024-10142-8
Domenico Fiorini, Alessia Simonini, Johan Steelant, David Seveno, Miguel Alfonso Mendez
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Abstract

This work investigates the capillary rise dynamics of highly wetting liquids in a divergent U-tube in the microgravity conditions provided by 78th European Space Agency (ESA) parabolic flight. This configuration produces a capillary-driven channel flow. We use image recording in backlight illumination to characterize the interface dynamics and dynamic contact angle of HFE7200 and Di-Propylene Glycol (DPG). For the case of HF7200, we complement the interface measurements with Particle Tracking Velocimetry (PTV) to characterize the velocity fields underneath the moving meniscus. In the DPG experiments, varying liquid column heights are observed, with a notable decrease in meniscus curvature when the contact line transitions from a pre-wetted to a dry substrate. In contrast, for HFE7200, the interface consistently advances over a pre-wetted surface. Despite this, a reduction in meniscus curvature is detected, attributed to inertial effects within the underlying accelerating flow. PTV measurements reveal that the region where the velocity profile adapts to the meniscus velocity decreases as interface acceleration increases, suggesting a direct relationship between acceleration and the velocity adaptation length scale.

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微重力条件下毛细管驱动流的实验特征
这项工作研究了在欧洲航天局(ESA)第 78 次抛物线飞行提供的微重力条件下,发散 U 形管中高度润湿液体的毛细管上升动力学。这种配置产生了毛细管驱动的通道流。我们使用背光照明下的图像记录技术来表征 HFE7200 和二丙二醇(DPG)的界面动态和动态接触角。对于 HF7200,我们使用粒子跟踪测速仪(PTV)对界面测量进行补充,以表征移动半月板下的速度场。在 DPG 实验中,我们观察到不同的液柱高度,当接触线从预湿基底过渡到干燥基底时,半月板曲率明显减小。与此相反,对于 HFE7200,界面在预湿表面上一直向前移动。尽管如此,仍检测到半月板曲率减小,这归因于底层加速流的惯性效应。PTV 测量显示,随着界面加速度的增加,速度剖面与半月板速度相适应的区域会减小,这表明加速度与速度适应长度尺度之间存在直接关系。
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来源期刊
Microgravity Science and Technology
Microgravity Science and Technology 工程技术-工程:宇航
CiteScore
3.50
自引率
44.40%
发文量
96
期刊介绍: Microgravity Science and Technology – An International Journal for Microgravity and Space Exploration Related Research is a is a peer-reviewed scientific journal concerned with all topics, experimental as well as theoretical, related to research carried out under conditions of altered gravity. Microgravity Science and Technology publishes papers dealing with studies performed on and prepared for platforms that provide real microgravity conditions (such as drop towers, parabolic flights, sounding rockets, reentry capsules and orbiting platforms), and on ground-based facilities aiming to simulate microgravity conditions on earth (such as levitrons, clinostats, random positioning machines, bed rest facilities, and micro-scale or neutral buoyancy facilities) or providing artificial gravity conditions (such as centrifuges). Data from preparatory tests, hardware and instrumentation developments, lessons learnt as well as theoretical gravity-related considerations are welcome. Included science disciplines with gravity-related topics are: − materials science − fluid mechanics − process engineering − physics − chemistry − heat and mass transfer − gravitational biology − radiation biology − exobiology and astrobiology − human physiology
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