Numerical Modelling Of Bubble Coalescence
And Droplet Separation
Author(s)
Y. Y. Yan & Y. Q. Zu
Abstract
Both bubble coalescence and droplet separation are important physical
phenomena in the natural world and a variety of process industries. This paper
presents results of numerical simulation of behaviours of bubble coalescence and
droplet separation. The velocity distribution functions of two particles are used
in lattice Boltzmann equations. Based on the lattice Boltzmann method (LBM),
both the phenomena of two rising bubbles coalescing in liquid and a liquid
droplet break-up on wetting boundaries are simulated. Typically, such
two-phase problems of large ratio of liquid–gas densities up to 1000 are studied.
Keywords: bubble coalescence, droplet separation, numerical modelling, lattice
Boltzmann method.
1 Introduction
Both bubble coalescence and droplet separation are important physical
phenomena in the natural world and a variety of process industries. It is a
common occurrence in two phase flow and flow boiling that the evolution of
bubbly flow to slug and annular flows accompanies processes of bubble
coalescences. The coalescence or separation of droplets are also popular in
droplet and film cooling condensations under difference surface conditions.
Numerical modelling of bubble coalescence or droplet separation has been
attempted by researchers for many years. Conventional CFD methods based on
solving Navier-stokes equations can simulate free surface flow and bubble shape
evolution with time [1-3] but can not effectively simulate problems of bubbles or
droplets coalescences. Although the phenomena of bubble coalescences have
been simulated by VOF method in [4] but only a two dimensional problem was
discussed and the ratio of gas-liquid densities was also limited.
Keywords
bubble coalescence, droplet separation, numerical modelling, lattice
Boltzmann method.
Related Book
Other papers in this volume
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