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Behaviour of liquid-liquid two-phase flow pattern and mass transfer with combined incorporation of fully pulsatile flow and variable volume of air suspension
Heat and Mass Transfer ( IF 2.2 ) Pub Date : 2020-06-09 , DOI: 10.1007/s00231-020-02885-y
Abir Chakravorty , Ashish Kumar , Subhrajit Mukherjee

The application of fully pulsatile flow in liquid-liquid two-phase extraction contributes to augment the interfacial mass transfer. Further, the inclusion of air at the top of the central test section combined with pulsatile flow augments the extraction or the mass transfer process. Toluene-water is chosen as an organic-aqueous two-phase liquid-liquid system with acetic acid as the transfer species which is added in dilute quantities 10 percentage by volume to the organic phase and the transfer of the same to the aqueous phase is recorded with the help of refractive index (RI) measurements. The RI is converted to an overall volumetric mass transfer coefficient with the help of a formula derived for the system. Experiments have been conducted for pulsatile flow with T junction having no air at the top and with variable volume 5, 10, 12, and 14 cm3 of air at the top of the cross junction. The results of mass transfer coefficients were compared and it was found that inclusion of air combined with flow pulsation leads to a higher degree of extraction in comparison to without pulsation and pulsatile flow with no air at the top. Also, the in-phase mode of pulsation with 2.5 Hz of frequency leads to enhanced extraction and a broader plug flow regime.



中文翻译:

结合全脉动流和可变体积空气悬浮液的液-液两相流模式和传质行为

全脉动流在液-液两相萃取中的应用有助于增加界面传质。此外,中央测试部分顶部的空气与脉动流相结合,增加了萃取或传质过程。选择甲苯-水作为有机-水两相液-液系统,以乙酸作为转移物质,将其以10体积%的稀释量添加至有机相,并记录其向水相的转移借助折射率(RI)测量。借助系统得出的公式,将RI转换为总体积传质系数。已经针对T形结的脉动流动进行了实验,该T形结的顶部没有空气,并且体积可变为5、10、12和14c m 3交叉连接顶部的空气。比较了传质系数的结果,发现与没有脉动和顶部没有空气的脉动流相比,结合有气流和脉动的空气的引入导致更高程度的提取。同样,频率为2.5 Hz的同相脉动模式可增强提取效果,并扩大推流范围。

更新日期:2020-06-09
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