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Hydrodynamics and mass transfer characteristics of circulating single drops with effect of different size nanoparticles

机译：不同型纳米粒子效应循环单滴流体动力学和传质特性

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摘要

The effect of three different size silica nanoparticles, ranged within 11-14, 20-30 and 60-70 nm, on the hydrodynamic and mass transfer of circulating drops in liquid-liquid extraction was investigated. Chemical system of toluene-acetic acid-water was used; toluene in nanofluid drop phase. Six concentrations of each nanoparticle, within 0.0005-0.005 wt%, were examined. Mass transfer direction was from nanofluid drops to aqueous continuous phase. Viscosity of nanofluids increases slightly with the size and concentration of the nanoparticles whereas the system interfacial tension remains almost constant. Terminal velocity values were comparable with those predicted by Grace and Vignes equations. The average and maximum mass transfer enhancements of 51.8 and 78.7% were achieved, respectively, with nanofluid drops. The smallest size nanoparticle at nearly the mid concentration of 0.003 wt% provides the highest enhancement. Nanoconvention caused by Brownian motion is the main plausible cause of this behavior. It was demonstrated that enhancement factor of diffusivity coefficient can be reproduced by a quadratic equation of drops' Reynlods number, and the Newman equation based on effective diffusivity can predict the mass transfer coefficient satisfactorily. (C) 2016 Elsevier B.V. All rights reserved.
机译：研究了三种不同尺寸的二氧化硅纳米颗粒的影响，范围在11-14,20-30和60-70nm内，对液 - 液萃取中循环下降的流体动力学和传质进行研究。使用甲苯乙酸 - 水的化学体系;甲苯在纳米流体下降阶段。检查每种纳米颗粒的六种浓度，在0.0005-0.005wt％之内。传质方向是从纳米流体下降到含水连续相中。纳米流体的粘度略微增加，纳米颗粒的尺寸和浓度，而系统界面张力几乎保持恒定。终端速度值与由恩典和鳞片方程预测的那些相当。分别实现了51.8和78.7％的平均值和最大传质增强，纳米流体液滴均达到51.8和78.7％。最小尺寸的纳米颗粒在0.003wt％的几乎中浓度提供最高的增强。布朗运动造成的纳米控制是这种行为的主要可符号原因。据证明，扩散系数的增强因子可以通过滴的雷诺编号的二次方程来再现，并且基于有效扩散率的纽曼方程可以预测令人满意的传质系数。 （c）2016年Elsevier B.v.保留所有权利。

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