Gas-Liquid Flows Through Porous Media in Microgravity: The International Space Station Packed Bed Reactor Experiment

Motil, Brian J.; Ramé, Enrique; Salgi, Paul; Taghavi, Mahsa; Balakotaiah, Vemuri

doi:10.22541/au.158525142.26061968

Cited by 2 publications

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“…It shows that at liquid flow rates greater than about 20 kg/h, the standard deviation increases beyond the accuracy of the pressure transducer (±0.14 kPa) which is an indication of the onset of pulse flow. Since dispersed bubble and pulse flow patterns have already been discussed in the literature, we refer to these studies 1,4–5 . The aircraft‐based correlation 4 appears to give a fair description of the observed transition and may be expressed as:

\frac{U_{GS}}{U_{LS}} goodbreak= normalΛ,

where the constant Λ depends on the packing size and fluid properties.…”

Section: Flow Regimes In Microgravitymentioning

confidence: 99%

“…The PBRE was designed to deliver a wide range of tightly controlled gas (nitrogen) and liquid (water) flows to interchangeable test sections. Details of the flow loop and test sections are described in detail in Motil et al 1 PBRE‐2 used the same gas and liquid flow loop so only the modifications or changes are discussed. For reference, the basic flow schematic is provided in Figure 1.…”

Section: Experiments and Test Conditionsmentioning

confidence: 99%

“…In addition, modifications were made to the test facility which are discussed in the experimental section. In this work, we extend the analysis to a wider range of gas and liquid flows (beyond the V‐C regime) than were considered in earlier studies 1–3 …”

Section: Introductionmentioning

confidence: 97%

“…In this work, we extend the analysis to a wider range of gas and liquid flows (beyond the V-C regime) than were considered in earlier studies. [1][2][3]…”

Section: Introductionmentioning

confidence: 99%

“…Results from the original PBRE flights are discussed in Motil et al, 1 which included two test series using 3 mm Glass and Teflon packing to compare the effects of wettability on pressure drop and phase distribution. PBRE‐2 extends these results to include a smaller size glass packing (2 mm) as well as longer duration test runs and a comparison of different pre‐flow conditions.…”

Section: Introductionmentioning

confidence: 99%

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Gas–liquid flows through porous media in microgravity: Packed Bed Reactor Experiment‐2

et al. 2022

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Modifications were made to the Packed Bed Reactor Experiment (PBRE) and flown on the International Space Station as PBRE-2 to eliminate external pressure oscillations at higher liquid flow rates and the packing diameter was reduced to increase the pressure gradient for lower flows. It is found that gas hold-up is a function of bed history at low liquid and gas flow rates whereas higher gas hold-up and pressure gradients are observed for the test conditions following a liquid only pre-flow compared to the test conditions following a gas only pre-flow period. Over the range of flow rates tested, the capillary force is the dominant contributor to the pressure gradient, which is found to be linear with the superficial liquid velocity but is a much weaker function of the superficial gas velocity and varies inversely with the particle diameter.

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\frac{U_{GS}}{U_{LS}} goodbreak= normalΛ,

where the constant Λ depends on the packing size and fluid properties.…”

Section: Flow Regimes In Microgravitymentioning

confidence: 99%

Section: Experiments and Test Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

“…In this work, we extend the analysis to a wider range of gas and liquid flows (beyond the V-C regime) than were considered in earlier studies. [1][2][3]…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Gas–liquid flows through porous media in microgravity: Packed Bed Reactor Experiment‐2

et al. 2022

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Hydrodynamics and mass transfer enhancement of gas–liquid flow in micropacked bed reactors: Effect of contact angle

et al. 2022

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Pressure drop, residence time distribution, dispersive behavior, liquid holdup, and mass transfer performance of gas–liquid flow in micropacked bed reactors (μPBRs) with different contact angles (CA) of particles are studied. The value of pressure drop for three types of beads can be obtained: copper beads (CA = 88.1°) > stainless steel beads (CA = 70.2°) > glass beads (CA = 47.1°). The liquid axial dispersion coefficient is 1.58 × 10−6 to 1.07 × 10−5 m2/s for glass beads and copper beads, which is smaller than those of trickle bed reactors. The liquid holdup of 400 μm copper beads is larger than that of 400 μm glass beads. The ratio of effective interfacial area enhancement is evaluated up to 55% for big contact angle beads compared with the hydrophilic glass beads. In addition, correlations of pressure drop, liquid holdup, and effective interfacial area in μPBRs with different wettability beads are developed and predicted values are in agreement with the experimental data.

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Gas-Liquid Flows Through Porous Media in Microgravity: The International Space Station Packed Bed Reactor Experiment

Cited by 2 publications

References 0 publications

Gas–liquid flows through porous media in microgravity: Packed Bed Reactor Experiment‐2

Gas–liquid flows through porous media in microgravity: Packed Bed Reactor Experiment‐2

Hydrodynamics and mass transfer enhancement of gas–liquid flow in micropacked bed reactors: Effect of contact angle

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