Modelling Molecular Gas Suspension Diffusion
And Saturation Processes In Liquid Media
Author(s)
R. Groll
Abstract
A model describing the suspension diffusion process of gas molecules in liquid
media is presented in this paper. This process is not yet solved by a satisfactory
model for micro-scale applications at this time. The new approach allows the
simulation of diffusion processes in continuous media considering the molecular
mass flux in a suspension/carrier phase mixture. Modelling the diffusion of gas
suspensions in liquid media the saturation mass ratio is reached near the liquid/gas
surface very quickly. The increase of gas concentration in the liquid domain
depends on the elapsed time and the physical properties of gas and liquid media.
Themolecular gas velocity is described by a Maxwell probability density function.
Modelling the gas species diffusion the molecular convection is considered.
Modelling the mass flux of the molecular gas suspension characteristic time scales
are developed describing the completion level of the saturation progress based on
non-dimensional formulations of the molecular convection equation. The present
model is implemented in a CFD code and validated by a family of parametric
simulation results depending on the saturation mass ratio of the suspended gas
phase. This simulation result array shows the dependency of saturation time and
saturation mass ratio of the suspended gas molecules. Based on this relation
macroscopic diffusion processes in micromixers and microchannels are described
with this model and without an extra solution of molecule trajectories or spectral
fields of molecule velocity.
Keywords: two-phase flow, molecular diffusion, gas/liquid, dispersion, saturation.
Keywords
two-phase flow, molecular diffusion, gas/liquid, dispersion, saturation.
Related Book
Other papers in this volume
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