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Experimental study and modelling of flow boiling in tube in normal and microgravity conditions

Colin, Catherine and Narcy, Marine Experimental study and modelling of flow boiling in tube in normal and microgravity conditions. (2018) In: Encyclopedia of two-phase heat transfer and Flow IV. Volume 4: Special Two-Phase Flow and Boiling Topics. World Scientific, New Jersey, 93-137. ISBN 978-981-3234-36-9

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Official URL: https://doi.org/10.1142/9789813234468_0003

Abstract

Forced convective boiling experiments are conducted in a tube in vertical upward flow under earth and under microgravity conditions. The experimental set-up was designed to obtain precise measurements of quality, cross-sectional averaged void fraction, wall shear stress and heat transfer coefficient. The measurement techniques are described and an evaluation of the uncertainties is provided. The test section is a 6mm diameter transparent sapphire tube, uniformly heated by an ITO coating. High-speed video pictures of the two-phase flow are taken through the transparent heated tube. The observed flow patterns are bubbly flow, slug flow and annular flow. Void fraction measurements give access to the mean vapor velocity in bubbly and slug flows and the averaged film thickness in annular flow. The simultaneous measurements of void fraction and pressure drop enable the wall and interfacial shear stresses to be determined. The wall shear stress is compared to classical Lockhart and Martinelli type models. New data on the interfacial shear stress are provided. Heat transfer coefficients are determined along the test section for a wide range of mass fluxes and qualities corresponding to nucleated boiling and convective boiling regimes. The results are then confronted to existing models and the role of buoyancy is highlighted.

Item Type:Book Section
Uncontrolled Keywords:
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:09 Apr 2020 15:50

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