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Gas liquid pipe flow in tube in microgravity: recent progress and future prospects

Colin, Catherine Gas liquid pipe flow in tube in microgravity: recent progress and future prospects. In: 6th International Symposium on Physical Science in Space, 22 September 2015 - 25 September 2015 (Kyoto, Japan). (Unpublished)

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Gas-liquid and liquid vapor-pipe flows in microgravity have been studied for more than forty years. The studies were motivated by potential applications for space industries with thermal control of satellites, propellant supply for launchers, waste water treatment for space exploration missions…Beside the applications, microgravity experiments provide unique conditions for highlighting and modeling capillary and inertia effects in the dynamics of two-phase flows. Several results were obtained on the flow pattern characterization. Three flow patterns are mainly observed : bubbly flow, slug flow with elongated bubbles separated by the liquid slug and annular flows with a gas core and a liquid film flowing at the wall. Different modelling are proposed to predict the transitions between the flow patterns. In microgravity, the wall shear stress can directly be deduced from pressure drop measurements. Microgravity data are compared to several correlations of the litterature. In annular flow, by measuring simultaneously the pressure drop and the void fraction it is also possible to calculate the interfacial shear stress from the momentum balance equation for the vapour. Few measurements of the interfacial shear stress are reported in the literature. Several authors performed measurements of heat transfer coefficients in flow boiling. At high mass flux the heat transfer coefficients are similar in 1-g and in 0-g except at low qualities (<0.15) in the subcooled nucleate boiling regime. At higher qualities, HTC does not depend on gravity and increases with quality. An annular flow regime is observed, the bubble nucleation in the liquid film disappears and the heat transfer is due to the evaporation of the liquid film. At low mass flux, HTC is always lower in 0-g than in 1-g, even for quality larger than 0.15 corresponding to annular flow regimes.

Item Type:Invited Conference
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Audience (conference):International conference without published proceedings
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Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
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Deposited On:26 Nov 2019 17:42

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