CFD Simulation of a Sub-millimetre Rising Bubble in a Stagnant Liquid.

0540247 - ÚCHP 2021 RIV CZ eng C - Conference Paper (international conference)
Crha, Jakub - Basařová, P. - Kašpar, O.
CFD Simulation of a Sub-millimetre Rising Bubble in a Stagnant Liquid.
Proceedings. Prague: Institute of Thermodynamics of the Czech Academy of Sciences, 2020 - (Šimurda, D.; Bodnár, T.), s. 35-41. ISBN 978-80-87012-74-1. ISSN 2336-5781.
[Topical Problems of Fluid Mechanics 2020. Praha (CZ), 19.02.2020-21.02.2020]
R&D Projects: GA ČR(CZ) GA19-09518S
Institutional support: RVO:67985858
Keywords : level set * bubble * single
OECD category: Chemical process engineering
http://www2.it.cas.cz/fm2015/im/admin/showfile/data/my/Papers/2020/05-TPFM2020.pdf

Hydrodynamics of the multiphase apparatus is strongly affected by fluids used in the process. One of the main quantities, which determine the hydrodynamic behaviour is the rising velocity of gaseous bubbles. This velocity can be determined easily in small scale apparatuses, but it can be much more challenging in industrial-scale devices. For that reason, mathematical modeling is used. COMSOL Multiphysics, finite element CFD solver, was used to describe the behaviour of the single bubble rising in aqueous solutions of ethanol and n-propanol. Aqueous solutions of low-carbon alcohols are extensively used in many multiphase chemical processes such as distillation, flotation and in multiphase reactors. Bubble velocities and shapes obtained from the simulation were compared to experimental and theoretical values. Two initial diameters of bubbles were used – 0.6 and 0.8 mm. Terminal velocities and shapes deformations obtained from COMSOL of 0.6 mm bubble were in an agreement with theoretical and experimental values.
Permanent Link: http://hdl.handle.net/11104/0317882