Transient Capillary Channel Flow Stability

Grah, Aleksander; Canfield, P.J.; Bronowicki, P. M.; Dreyer, Michael; Chen, Yongkang; Weislogel, Mark

doi:10.1007/s12217-014-9403-z

Cited by 6 publications

(4 citation statements)

References 14 publications

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“…A comparison between experimental and modeled critical flowrates is shown in Figure 2. Grah et al developed a model for the transient capillary channel flow stability and confirmed the accuracy of steady-state models (Grah et al, 2014). They confirmed that numerical predictions of critical steady-state flow rates are possible with high accuracy.…”

Section: Capillary Flowmentioning

confidence: 81%

“…The advantage of the 1D-model over a 3D-model is the computing time. Grah et al mentioned that the 1D-model is 10 6 times faster than 3D computations (Grah et al, 2014). Next, a new stability model was provided to reliably predict transient surface stability: A transient model, unlike a steady-state model, also takes the inertia of the accelerated liquid into account.…”

Section: Capillary Flowmentioning

confidence: 99%

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Microfluidics and Macrofluidics in Space: ISS-Proven Fluidic Transport and Handling Concepts

Nijhuis

Schmidt

Tran

et al. 2022

Front. Space Technol.

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Fluid transport and handling in extraterrestrial conditions, i.e. microgravity, require significantly different system engineering than here on Earth. On Earth, a notable part of fluid processing units inherently relies on buoyancy to transport and handle fluids. In space, however, buoyancy effects are negligible due to the strong diminishment of gravity, resulting in the domination of surface tension forces. Surface tension forces are also dominating micro-scale processes in gravity, making microfluidics a promising technology for fluidic transport and handling in microgravity. Recently, three different microfluidics-suitable fluid behavior phenomena have been studied on the ISS that might further facilitate the manipulation of fluids in space: capillary-driven flow, thermocapillary Marangoni forces, and electrolytic gas evolution-driven flow. Furthermore, attention is drawn for strategies to eliminate unwanted bubbles from liquid bodies in space, as they can damage sensitive equipment: Mesh-screen capillarity and open wedge channels have been identified as promising approaches. Finally, the relevance of fluid handling in space is illustrated with everyday activities during space missions, such as drinking, plant watering, and gathering biometric data.

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Section: Capillary Flowmentioning

confidence: 81%

Section: Capillary Flowmentioning

confidence: 99%

Microfluidics and Macrofluidics in Space: ISS-Proven Fluidic Transport and Handling Concepts

Nijhuis

Schmidt

Tran

et al. 2022

Front. Space Technol.

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“…The unsteady flow in parallel plates is studied theoretically, numerically, and experimentally by Grah and colleagues. [7][8][9] Haake et al 10 expanded 1D theory to groove-shaped channel and verified the numerical solution in the Bremen drop tower.…”

Section: Introductionmentioning

confidence: 92%

Numerical study on flow rate limitation of open capillary channel flow through a wedge

Zhang

Yang

Lin

et al. 2016

Advances in Mechanical Engineering

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The flow characteristics of slender-column flow in wedge-shaped channel under microgravity condition are investigated in this work. The one-dimensional theoretical model is applied to predict the critical flow rate and surface contour of stable flow. However, the one-dimensional model overestimates the critical flow rate for not considering the extra pressure loss. Then, we develop a three-dimensional simulation method with OpenFOAM, a computational fluid dynamics tool, to simulate various phenomena in wedge channels with different lengths. The numerical results are verified with the capillary channel flow experimental data on the International Space Station. We find that the three-dimensional simulation perfectly predicts the critical flow rates and surface contours under various flow conditions. Meanwhile, the general behaviors in subcritical, critical, and supercritical flow are studied in three-dimensional simulation considering variations of flow rate and open channel length. The numerical techniques for three-dimensional simulation is validated for a wide range of configurations and is hopeful to provide valuable guidance for capillary channel flow experiment and efficient liquid management in space.

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“…This phenomenon was studied in detail by Rosendahl et al (2004) for a parallel plate channel aboard a sounding rocket and in the drop tower. Grah et al (2014), Canfield et al (2013), and Bronowicki et al (2015) investigated capillary dominated free surface flows in different open channel geometrical shapes (parallel plate, rectangular groove, and wedge) aboard the International Space Station (ISS). The stability of the free surface may also be affected by sudden accelerations and vibrational disturbances.…”

Section: Introductionmentioning

confidence: 99%

Phase Separation in Porous Media Integrated Capillary Channels

Bisht

Dreyer

2020

Microgravity Sci. Technol.

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Phase separation in space is critical for gas-free propellant supply, life support systems, refueling of spacecraft in low earth orbit (LEO), and for deep space exploration missions. In the absence of gravity, the stability of the liquid-gas interface depends on capillary forces. High liquid flow rates, sudden accelerations, and vibrational disturbances can cause the free surface of the liquid to collapse, which results in the ingestion of gas. Propellant tanks may have screen channel liquid acquisition devices (SCLADs) to position and maintain a gas-free propellant supply to the outlet. A saturated porous screen permits liquid to pass through but acts as a barrier to the gas. We investigated phase separation in porous media integrated capillary channels during parabolic flights (33rd DLR parabolic flight campaign in March 2019). An open side of a rectangular channel was covered with a dutch twill weave 200×1400. The liquid was ingested into the channel from its surroundings by establishing a differential pressure across the screen section. The gas-phase was blocked during the liquid withdrawal. We could show that the gas breakthrough occurs when the pressure difference across the screen exceeds the bubble point pressure. The experimental results showed good agreement with correlations from literature.

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Transient Capillary Channel Flow Stability

Cited by 6 publications

References 14 publications

Microfluidics and Macrofluidics in Space: ISS-Proven Fluidic Transport and Handling Concepts

Microfluidics and Macrofluidics in Space: ISS-Proven Fluidic Transport and Handling Concepts

Numerical study on flow rate limitation of open capillary channel flow through a wedge

Phase Separation in Porous Media Integrated Capillary Channels

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