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CFD Modelling of Bubble-Bubble Coalescence

Zakaria, Zalinawati (2010) CFD Modelling of Bubble-Bubble Coalescence. Universiti Teknologi PETRONAS. (Unpublished)

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Abstract

The content of this report summarizes the outcome of the CFD Modelling of Bubble-bubble Coalescence project. The main project objective is to investigate the dynamics of coalescence process of two co-axial bubbles within liquid phase under laminar flow condition. Computational Fluid Dynamics (CFD) software has been used in this project to simulate the coalescence process which focuses on 3-dimensional simulation. In many engineering process, it is founded that a lack of understanding in bubble coalescence mechanism will complicate the study ofdispersion process and mass transfer mechanisms to optimize equipment design. Thus it is important to understand the bubble coalescence behaviours that can lead to the change of bubble size distributions in controlling mass transfer between gas and liquid. This project deals with multiphase flow which is gas-liquid flow. The modelling approach selected is Volumeof- Fluid method (VOF) which commonly used to analyse the dynamic and deformation of the liquid-gas interface. The main tool required in this project is FLUENT which is CFD software and other software have been used are GAMBIT and AutoCAD.. Based on the numerical result, the analysis was done to visualize coalescence mechanism which can be described into three consecutive steps; (1) collision of bubbles, (2) trapping and thinning of a thin liquid film and (3) film rupture. This agrees with the description given by Oolman, T. O. and Blanch, H. W., 1986. Futhermore, the effect of surface tension on the coalescence have been studied as one of the objectives. From the result, a high surface tension is observed to produce a weak liquid jet behind the bubbles and the resultant high surface tension force prohibits the surface stretching. These all cause a late coalescence to occur. In addition, from the result generated by CFD, the bubble trajectories can be plotted accurately and such an information should be helpful in hydrodynamics modelling of bubbly flows. In conclusion, the mechanism of coalescence can be investigated using CFD software and the project objectives are satisfied.

Item Type: Final Year Project
Academic Subject : Academic Department - Chemical Engineering - Reactor Technology
Subject: T Technology > TP Chemical technology
Divisions: Engineering > Chemical
Depositing User: Users 2053 not found.
Date Deposited: 08 Jan 2014 08:48
Last Modified: 08 Jan 2014 08:48
URI: http://utpedia.utp.edu.my/id/eprint/10816

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