Diffusive Transfer between a Droplet and an Immiscible Oscillating Liquid in a Radial Hele-Shaw Cell  

作　　者：Ivan Karpunin Denis Polezhaev 

机构地区：[1]Laboratory of Vibrational Hydromechanics,Perm State Humanitarian Pedagogical University,Perm,614990,Russia

出　　处：《Fluid Dynamics & Materials Processing》2025年第3期543-553,共11页流体力学与材料加工(英文)

基　　金：supported by the Russian Science Foundation(Grant No.23-11-00242).

摘　　要：An experimental study of the diffusive mass transfer between a droplet and an oscillating immiscible liquid in a horizontal axisymmetricHele-Shaw cell is carried out.Theliquid oscillates radially in the cell.Thetransverse size of the droplet exceeds the cell thickness.The viscosities of the droplet and the surrounding liquid are comparable.Relevant effort is provided to design and test an experimental setup and validate a protocol for determining the mass transfer rate of a solute in a two-liquid system.In particular,fluorescent dye Rhodamine B is considered as the solute.A critical comparison of the situations with and without oscillation is implemented.A procedure is introduced and validated to determine the molecular and effective diffusion coefficients through evaluation of the growth of the diffusion zone width over time.It is shown that,in the presence of the liquid oscillations,there is a significant increase in the width of the zone in which Rhodamine B is present compared to the reference case with no oscillations.The oscillatory flow leads to an intensification of the solute diffusion due to intense time-averaged flows inside the droplet and the surrounding liquid and oscillations of the drop itself.Thestudy is of significant practical interest with particular relevance to typical processes for liquid-liquid extraction.

关 键 词：OSCILLATIONS DROPLET VISCOSITY diffusion Rhodamine B fluorescence radial Hele-Shaw cell 

分 类 号：TQ021.4[化学工程] O35[理学—流体力学]