Gas entrainment by a liquid film falling around a stationary Taylor bubble in a vertical tube |
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| Institution: | 1. State Key Laboratory of Chemical Engineering, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;2. Laboratory of Reactions and Process Engineering, University of Lorraine, CNRS, 1, rue Grandville, BP 20451, 54001 Nancy Cedex, France;1. Graduated School of Engineering, Kobe University, Japan;2. University of Notre Dame, Notre Dame, USA;1. Departamento de Engenharia Química e Biológica, Instituto Superior de Engenharia do Instituto Politécnico de Coimbra, Rua Pedro Nunes, Quinta da Nora, 3030-199 Coimbra, Portugal;2. Centro de Estudos de Fenómenos de Transporte, Faculdade de Engenharia da Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;1. Department of Energy Engineering, Zhejiang University, Hangzhou 310027, China;2. Department of Energy Engineering, Collaborative Innovation Center of Advanced Aero-Engine, Zhejiang University, Hangzhou 310027, China;3. School of Chemical and Biomolecular Engineering, University of Sydney, Sydney, NSW 2006, Australia |
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| Abstract: | Gas entrainment by a liquid film falling around a stationary Taylor bubble in a 0.1 m diameter vertical tube is studied experimentally with the purpose of validating a model formulated in an earlier phase of our research. According to this model for a fixed liquid velocity the gas entrainment should be proportional to the waviness of the film (its intermittency) and the wave height and inversely proportional to the film thickness. For Taylor bubble lengths ranging from 1D to 15D these film parameters have been measured with a Laser Induced Fluorescence technique. The gas entrainment has been determined from the net gas flux into the liquid column underneath the Taylor bubble by using data on gas re-coalescence into the rear of the Taylor bubble. These data are available for lengths ranging from 4.5D to 9D. The model results with the measured film characteristics compare well with the observed gas entrainment. The fact that the net gas flux becomes constant for long Taylor bubbles, whereas the wave height still increases, warrants further study. |
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