Flow patterns and pressure drop of ionic liquid-water two-phase flows in microchannels
Flow patterns and pressure drop of ionic liquid-water two-phase flows in microchannels
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DOI：
10.1016/j.ijmultiphaseflow.2013.02.002
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发表时间：
2013-09-01
影响因子：
3.8
通讯作者：
Seddon, Kenneth R.
中科院分区：
文献类型：
--
作者：
Tsaoulidis, Dimitrios;Dore, Valentina;Seddon, Kenneth R.
研究了疏水性离子液体和水在由三种不同材料（两种类型的特氟龙、FEP和特夫泽尔以及玻璃）制成的毛细管中的两相流动，尺寸在200 μ m和270 gm之间。离子液体为1-丁基-3-甲基咪唑双{（三氟甲基）磺酰基}酰胺，密度和粘度分别为1420 kg m（-3）和0.041 kg m（-1）s（-1）。流动模式和压降进行了测量两个入口配置（T型和Y型接头），总流量为0.065-214.9厘米（3）小时（-1）和离子液体体积分数从0.05到0.8。玻璃毛细管中的连续相取决于最初填充通道的流体。当水首先引入时，它变成连续相，离子液体在其中形成塞或塞和液滴的混合物。在Teflon微通道中，流体引入的顺序不影响结果，离子液体总是连续相。观察到的主要模式是环形，塞状和滴状流。在恒定的离子液体流速下，Teflon微通道中的压降被发现随着离子液体体积分数的降低而增加，并且总是高于在两相混合物中相同流速下的单相离子液体值。然而，在玻璃微通道中，在以水作为连续相的活塞流期间，恒定离子液体流速的压降总是低于单相离子液体值。一个修改后的活塞流压降模型使用的膜厚度的相关性，目前的流体对得出的实验数据显示出非常好的协议。(C)2013爱思唯尔有限公司保留所有权利。
The two-phase flow of a hydrophobic ionic liquid and water was studied in capillaries made of three different materials (two types of Teflon, FEP and Tefzel, and glass) with sizes between 200 pm and 270 gm. The ionic liquid was 1-butyl-3-methylimidazolium bis{(trifluoromethyl)sulfonyl}amide, with density and viscosity of 1420 kg m(-3) and 0.041 kg m(-1) s(-1), respectively. Flow patterns and pressure drop were measured for two inlet configurations (T- and Y-junction), for total flow rates of 0.065-214.9 cm(3) h(-1) and ionic liquid volume fractions from 0.05 to 0.8. The continuous phase in the glass capillary depended on the fluid that initially filled the channel. When water was introduced first, it became the continuous phase with the ionic liquid forming plugs or a mixture of plugs and drops within it. In the Teflon microchannels, the order that fluids were introduced did not affect the results and the ionic liquid was always the continuous phase. The main patterns observed were annular, plug, and drop flow. Pressure drop in the Teflon microchannels at a constant ionic liquid flow rate, was found to increase as the ionic liquid volume fraction decreased, and was always higher than the single phase ionic liquid value at the same flow rate as in the two-phase mixture. However, in the glass microchannel during plug flow with water as the continuous phase, pressure drop for a constant ionic liquid flow rate was always lower than the single phase ionic liquid value. A modified plug flow pressure drop model using a correlation for film thickness derived for the current fluids pair showed very good agreement with the experimental data. (C) 2013 Elsevier Ltd. All rights reserved.