Journal
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
Volume 50, Issue 4, Pages 2323-2330Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ie902055p
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Funding
- National Natural Science Foundation of China [20590365, 20776132]
- National High Technology Research and Development Program of China [2007AA05Z148]
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences [K20060275]
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Based on computational fluid dynamics (CFD), gas-liquid mass transfer in upward Taylor flow through vertical circular capillaries was studied. To save computational resources and time, the numerical simulations were carried out in a moving frame of reference attached to Taylor bubbles. Three consecutive Taylor bubbles were used to mimic the behavior of Taylor flow in an infinitely long capillary. Steady-state solutions of concentration fields were obtained to describe gas transfer from Taylor bubbles to the liquid phase. The liquid-phase volumetric mass-transfer coefficient, K(L)a, was investigated as a function of various parameters, including the liquid-film length, liquid-slug length, liquid-film thickness, bubble rise velocity, liquid-phase diffusivity, capillary diameter, and gravity. One fitted equation, expressed with three dimensionless numbers, was developed to quantify the relationship between K(L)a and the above parameters. The examples show that the equation could predict K(L)a well. The contributions of the cylindrical bodies and hemispherical caps of Taylor bubbles on the overall mass transfer were studied separately.
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