DEVELOPED LIQUID FILMS FALLING AROUND TAYLOR BUBBLES INSIDE VERTICAL STAGNANT COLUMNS

Authors

  • Marcos Bertrand de Azevedo Instituto de Engenharia Nuclear (IEN/CNEN)

DOI:

https://doi.org/10.15392/bjrs.v9i2B.1391

Keywords:

Taylor bubbles, Vertical tubes, Ultrasonic technique, Falling film, laminar-turbulent transition.

Abstract

The present work reports an experimental study of developed liquid films falling around single Taylor bubbles inside vertical tubes containing stagnant liquids. Experiments were carried out in acrylic tubes with 2.0 m length and inner diameters of 0.019, 0.024 and 0.034 m. Five water-glycerin mixtures were used, corresponding to film Reynolds number(Ref)ranging from 2 to 7650. A pulse-echo ultrasonic technique was applied to measure the rise velocity of the bubble and the equilibrium thickness of the liquid film. These parameters together with the calculated standard deviation of the equilibrium film thickness provided information about the development of waves on the gas-liquid interfaces, which could be related with the laminar-turbulent transition of liquid films falling around Taylor bubbles. The results indicated that the wave amplitudes increased sharply for Ref> 1000. This value of Ref is in agreement with literature concerning the laminar-turbulent transition for free falling films on vertical surfaces.

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Author Biography

  • Marcos Bertrand de Azevedo, Instituto de Engenharia Nuclear (IEN/CNEN)
    Engenheiro metalúrgico, com DsC em Eng. Nuclear na COPPE/UFRJ, lotado no Laboratório de Termo-Hidráulica Experimental (LTE) do Serviço de Engenharia e Tecnologia de Reatores Nucleares (SETER/DINUC/IEN).

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Published

2021-07-25

Issue

Section

XXI Meeting on Nuclear Reactor Physics and Thermal Hydraulics (XXI ENFIR) and VI ENIN

How to Cite

DEVELOPED LIQUID FILMS FALLING AROUND TAYLOR BUBBLES INSIDE VERTICAL STAGNANT COLUMNS. Brazilian Journal of Radiation Sciences, Rio de Janeiro, Brazil, v. 9, n. 2B (Suppl.), 2021. DOI: 10.15392/bjrs.v9i2B.1391. Disponível em: https://bjrs.org.br/revista/index.php/REVISTA/article/view/1391. Acesso em: 23 dec. 2024.

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