Study On Enhancement Of Gas-liquid Mass Transfer In Microchannel By Fine Particles

The micro-chemical engineering and particles intensification technology, whichhave been adopted in gas-liquid adsorption, liquid-liquid extraction, andheterogeneous catalytic reaction, are emerging methods in chemical processintensification and also are the development direction of the current chemical industry.As a result, in the era of high efficiency and energy saving, widely carrying outintegrated study on the two technologies is of necessity and importance.This article has chosen CO₂-H₂O gas-liquid two-phase as the research system,and has studied effects of two types of fine solid particles-the physical adsorption typeand chemical reaction type on gas-liquid mass transfer under Taylor flow in thehomemade micro-channel for the inner diameter of1mm. The paper mainly discussedwhat the changing gas-liquid rates and solid particles concentration made on masstransfer enhancement factor, bubble length and pressure drop from the channel importto the export, and developed the mechanism analysis for different types of particles.Among them, it is attributed to the shuttling mechanism for the particles of physicalabsorption type, while it is primarily due to reaction of the ion in the solution and thegas to adsorb for the particles of chemical reaction type.Through the experiment, it is clear that the factors of hydrophobic property andadsorption ability have made important roles on mass transfer enhancement,according to which, a heterogeneous mass transfer model has been established forparticles of physical adsorption type. The model has divided mass transfer into the capand the film parts, introducing circulation flow theory. By the model, it was exploredthat the influence of particles size, non-dimensional mass transfer coefficients,adsorption ability, solid loading, apparent viscosity, and gas-liquid speeds were madeon the enhancement factor. Finally the experiment data and the calculated value fittedwell. Therefore the model has a good practicability for the hydrophobic andadsorption particles in micro-channel.