Impact of inlet design on mass transfer in gas–liquid rectangular microchannels
Impact of inlet design on mass transfer in gas–liquid rectangular microchannels
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DOI：
10.1007/s10404-008-0292-6
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发表时间：
2009
影响因子：
2.8
通讯作者：
D. Fries;P. Rudolf von Rohr
中科院分区：
文献类型：
--
作者：
D. Fries;P. Rudolf von Rohr
研究了矩形微通道内泰勒流中气泡和液塞的长度。在气体和液相的流量比恒定的情况下，我们能够仅通过改变入口几何形状来改变晶胞长度，并因此改变气泡长度以及4倍的液体段塞长度。本文在文献和实验数据的基础上，提出了一个新的矩形微通道内气泡长度、液塞长度和压降的计算公式。所观察到的段塞长度的减少对应于舍伍德数的增加，因此传质增加了1.6倍。短的晶胞长度，意味着液体段塞内的增强的传质和增加的界面面积，可以使用与主通道相比小的气体入口通道和在流动方向上的注入来实现给定的流速。
The length of the gas bubbles as well as of the liquid slugs in Taylor flow in rectangular microchannels was studied. At constant flow ratios of the gas and the liquid phase, we were able to vary the unit cell length, and therefore the gas bubble length as well as the liquid slug length by factor 4 solely by changing the inlet geometry. Based on literature and experimental data, we state a new correlation to predict the gas bubble length, the liquid slug length as well as the pressure drop for rectangular microchannels. The observed decrease in slug length for the investigated case corresponds to an increase in the Sherwood number and therefore of the mass transfer by a factor of 1.6. Short unit cell lengths, meaning enhanced mass transfer within the liquid slug and increased interfacial area, can be achieved for given flow rates using a small gas inlet channel compared to the main channel and injection in flow direction.