Effect of Channel Size on Liquid-Liquid Plug Flow in Small Channels
Effect of Channel Size on Liquid-Liquid Plug Flow in Small Channels
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DOI：
10.1002/aic.15026
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发表时间：
2016-01-01
期刊：
影响因子：
3.7
通讯作者：
Angeli, Panagiota
中科院分区：
文献类型：
--
作者：
Tsaoulidis, Dimitrios;Angeli, Panagiota
对于离子液体/水两相系统，水相形成分散塞，在内径为 0.5、1 和 2 mm 的小通道中研究了塞流的流体动力学特性。明场粒子图像测速与高速成像相结合，用于获得塞长度、速度和薄膜厚度，并获取塞内的速度分布。塞长度随着混合物速度的增加而减小，而对于恒定的混合物速度，塞长度随着通道尺寸的增加而增加。塞速度随着混合物速度和通道尺寸的增加而增加。通过 Taylor 模型（Taylor，J Fluid Mech. 1961；10(2)：161-165）相当好地预测了 Ca > 0.08 时的膜厚度。在塞子的中心区域建立了充分发展的层流轮廓。随着通道尺寸的增加，塞子中的循环时间减少。通过修改后的文献模型，使用从实验值得出的膜厚度的新相关性，可以很好地预测压降。 (C) 2015 年作者 AIChE 期刊由 Wiley periodicals, Inc. 代表美国化学工程师学会出版
The hydrodynamic properties of plug flow were investigated in small channels with 0.5-, 1-, and 2-mm internal diameter, for an ionic liquid/aqueous two-phase system with the aqueous phase forming the dispersed plugs. Bright field Particle Image Velocimetry combined with high-speed imaging were used to obtain plug length, velocity, and film thickness, and to acquire velocity profiles within the plugs. Plug length decreased with mixture velocity, while for constant mixture velocity it increased with channel size. Plug velocity increased with increasing mixture velocity and channel size. The film thickness was predicted reasonably well for Ca > 0.08 by Taylor's (Taylor, J Fluid Mech. 1961; 10(2): 161-165) model. A fully developed laminar profile was established in the central region of the plugs. Circulation times in the plugs decreased with increasing channel size. Pressure drop was predicted reasonably well by a modified literature model, using a new correlation for the film thickness derived from experimental values. (C) 2015 The Authors AIChE Journal published by Wiley Periodicals, Inc. on behalf of American Institute of Chemical Engineers