| The dispersion coupling interphase mass transfer process is quite important in chemical industry,during which the interfacial tension(IFT)influences the two-phase disperse greatly.However,it is still a challenge for the determination of the dynamic IFT in the disperse process.In this dissertation we developed a new method to determine the dynamic IFT in the dispersion coupling interphase mass transfer process through the microfluidic technology,then the IFT changing rule and influence factors have also been systematically studied.1.The liquid-liquid dispersion coupling interphase mass transfer process in coaxial microfluidic device was studied with an online micrograph collecting and analyzing system.After discussing the influence of the fluid properties,operating conditions,and solute concentration towards the dispersion process,it was found that the change of IFT because of interphase mass transfer shows an obviously different way.2.A new method to determine the dynamic IFT during the droplet formation process has been developed based on the pressure drop of the dispersed phase.Then we studied different liquid-liquid constant IFT systems without interphase mass transfer and determined their IFT.The calculated data was in good agreement with the results of the commercial interfacial tensiometer,and the pressure-based method showed good validity and feasibility.In addition,the influence of operating conditions in this method was studied,and the range of application was determined.3.Three different interphase mass transfer coupling micro-dispersion system was studied,and their dynamic IFT during droplet formation process was determined by the new method introduced in this dissertation.Then we investigated the influence of physical properties,two phase flow velocity,and solute concentration to the dynamic IFT,and did deep analysis to the mechanism. |
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