Modelling of Fluid flow and Mass transfer in a Fiber Reactor using Computational Fluid Dynamics

Abstract

Flow visualization experiments in micro channels output information on the fluid flowrates, heat transfer coefficients, mass transfer coefficients, size and stability of droplets etc. These data are useful for designing microfluidic processes, scaling up, fine tuning process parameters and, optimization. Some cons in conducting experimental observations are the time it takes to design and set-up Also, several experiments are conducted varying so many parameters. The research is focused on modelling and simulating parallel multiple microfluidic channels using Computational Fluid Dynamics techniques. These channels are comprised of thousands of micron-sized steel fibers that bring into contact two immiscible phase with enhanced mixing and separation capabilities. Fluid flow has been modelled using the COMSOL software and the droplet break-up was observed in these channels. The velocity, pressure and fluid-fluid interphase plots are presented. Due to large difference in the scales of features in the reactor, the models had to be solved using high performance computing. The simplification of the model by the application of symmetry and periodic boundary conditions was explored. The results of these modifications are also reported and compared with the former method. Results from parametric studies on relative velocity, temperature, relative viscosity and contact angle are presented.