Study of Capillary Driven Flow in an Interior Corner of Rounded Wall Under Microgravity

Li, Yongqiang; Hu, Mingzhu; Liu, Ling; Su, Yin-Yin; Li, Duan; Kang, Qi

doi:10.1007/s12217-015-9435-z

Cited by 17 publications

(3 citation statements)

References 12 publications

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“…Capillary corner flows have gained recent attention due to their prevalence aboard spacecraft for low-g liquid containment devices and have such been studied in myriad geometries including flows in propellant tank vane networks 12 , flow stability 13 , curved corners 14 , open rectangular channels 15 , and theoretical 16 and experimental 17 , 18 flows along nonplanar corners. Examples of short-duration low-g numerical investigations include single interior corners 19 , square channels 20 , stepped corners 21 , rounded corner walls 22 , and rounded vertices 23 , 24 . These investigations assume local parallel flow with negligible streamwise curvature and inertia as highlighted in earlier developments 25 – 27 .…”

Section: Introductionmentioning

confidence: 99%

The draining of capillary liquids from containers with interior corners aboard the ISS

2021

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In this work, we analyze liquid drains from containers in effective zero-g conditions aboard the International Space Station (ISS). The efficient draining of capillary fluids from conduits, containers, and media is critical in particular to high-value liquid samples such as minuscule biofluidics processing on earth and enormous cryogenic fuels management aboard spacecraft. The amount and rate of liquid drained can be of key concern. In the absence of strong gravitational effects, system geometry, and liquid wetting dominate capillary fluidic behavior. During the years 2010–2015, NASA conducted a series of handheld experiments aboard the ISS to observe “large” length scale capillary fluidic phenomena in a variety of irregular containers with interior corners. In this work, we focus on particular single exit port draining flows from such containers and digitize hours of archived NASA video records to quantify transient interface profiles and volumetric flow rates. These data are immediately useful for theoretical and numerical model benchmarks. We demonstrate this by making comparisons to lubrication models for slender flows in simplified geometries which show variable agreement with the data, in part validating certain geometry-dependent dynamical interface curvature boundary conditions while invalidating others. We further compare the data for the draining of complex vane networks and identify the limits of the current theory. All analyzed data is made available to the public as MATLAB files, as detailed within.

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Section: Introductionmentioning

confidence: 99%

The draining of capillary liquids from containers with interior corners aboard the ISS

2021

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“…Surface-tension-driven flows have been widely explored. Weislogel et al derived dynamic equations of surface-tension-driven flows along interior corners, and the same method has been adopted to derive the dynamic equations of flows along interior corners formed by planar walls of varying wettability, rounded interior corners, interior corners of rounded walls, curved interior corners, and interior corners in plate type tanks . Zhou et al comprehensively studied surface-tension-driven flows along corners with arbitrary cross-sections and presented universal mathematical models of flows.…”

Section: Introductionmentioning

confidence: 99%

Profiles of Static Liquid–Gas Interfaces in Axisymmetric Containers with Different Accelerations

Chen,

Gao,

et al. 2024

Langmuir

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Second-order perturbation solutions of profiles of bubbles suspended in liquid and liquid−gas interfaces when liquid all sinks in the bottom with different accelerations are derived. Six procedures are developed based on these solutions, and they are divided into two types. One type takes the coordinates of end points of profiles as input, and the other type takes liquid volume or gas volume as input. Numerical simulations are performed with the Volume of Fluid method, and numerical results are in good agreement with the predictions of these procedures. The greater the acceleration, the flatter the bubble until all liquid sinks to the bottom. Effects of acceleration on bubble shape must be considered; otherwise, it will cause a volume prediction error of up to 10%. When all liquid sinks to the bottom, predictions of liquid volume with the same liquid meniscus height as inputs differ considerably for different accelerations. The most significant change in liquid volume occurs when the bond number Bo ≪ 1. Effects of acceleration and liquid contact angle on the liquid−gas interfaces must be considered when evaluating liquid residue. These findings should be quite helpful for liquid residue measurement and fine management in spacecraft.

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“…Capillary driven ows in tubes were deeply analyzed (Stange et al, 2003;Figliuzzi et al, 2013;Chen et al, 2023), and the whole ow process was divided into three stages or two stages according to Oh numbers. Theoretical expressions of capillary ows in different shapes of corners are also derived (Weislogel et al, 1998(Weislogel et al, , 2005Chen et al, 2006;Li et al, 2012;Li et al, 2015;Wu et al, 2018). The interior corner ow theory is adopted to design the PMD, and it's validated by drop tower experiments (Wei et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Study on liquid reorientation in tank models aboard the Chinese Space Station

Chen,

et al. 2024

Preprint

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Propellant tanks provide non-entrained propellant for thrusters of satellites, which plays an important role in space mission. And the fluid transfer efficiency of tanks is the key to supply non-entrained propellant. An experiment cabin containing two different scaled tank models are designed and experiments of liquid reorientation under microgravity are carried out in the Chinese Space Station. Experiment results present the high liquid transportation efficiency of the two kinds of propellant management devices. Finite element models of the two tank models are established and verified by simulation matching with experiments. Furthermore, methylhydrazine is adopted to carry out more simulation analysis by considering different liquid contact angles and surface tension, and numerical results show smaller liquid contact angle and bigger surface tension can increase liquid flow speed. This research can provide theory and data support for the design of plate type tanks.

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Study of Capillary Driven Flow in an Interior Corner of Rounded Wall Under Microgravity

Cited by 17 publications

References 12 publications

The draining of capillary liquids from containers with interior corners aboard the ISS

The draining of capillary liquids from containers with interior corners aboard the ISS

Profiles of Static Liquid–Gas Interfaces in Axisymmetric Containers with Different Accelerations

Study on liquid reorientation in tank models aboard the Chinese Space Station

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