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Droplet formation in oval microchannels with a double T junction: a CFD and experimental study
Brazilian Journal of Chemical Engineering ( IF 1.2 ) Pub Date : 2021-07-09 , DOI: 10.1007/s43153-021-00133-2
Fabio C. S. Siqueira 1 , Hélio Giannini 1 , Ardson dos S. Vianna Jr 1
Affiliation  

The use of microfluidics can improve the process of droplet formation while reducing energy consumption. In the present work, a microreactor system with a double T junction and oval microchannel reactor 2509 mm long was analyzed. The stream was composed of styrene, water, and an emulsifier. The concentration of water in the emulsion and the flow rates of water and styrene were evaluated. Droplets were observed at styrene/water flow rate ratios (Qd/Qc) ranging from 1:10 to 1:80. The simulations in the double T junction were carried out with laminar flow and the Volume Of Fluids model was selected for the phase interactions. Experiments with four flow rates of styrene and water were carried out. A simple optical system was used for in-line observation of droplets formed in the microreactor. For the flow ratio 1:1, there was no drop formation. For the other rates, droplets were observed from 59 to 200 μm. The droplets moved along the reactor maintaining shape and size. This fact indicated that the micro reaction system is suitable for developing a system that requires stability, such as emulsion polymerizations. The comparison between model and experimental results pointed out that these were reasonably represented by the model.



中文翻译:

具有双 T 连接的椭圆形微通道中的液滴形成:CFD 和实验研究

微流体的使用可以改善液滴形成过程,同时降低能耗。在目前的工作中,分析了具有双 T 形接头和 2509 毫米长的椭圆形微通道反应器的微反应器系统。该流由苯乙烯、水和乳化剂组成。评估乳液中水的浓度以及水和苯乙烯的流速。在 1:10 至 1:80 的苯乙烯/水流速比 (Qd/Qc) 下观察到液滴。双 T 型结中的模拟是用层流进行的,并且为相相互作用选择了流体体积模型。用四种流速的苯乙烯和水进行了实验。一个简单的光学系统用于在线观察微反应器中形成的液滴。对于 1:1 的流量比,没有液滴形成。对于其他速率,从 59 到 200 μm 观察到液滴。液滴沿反应器移动,保持形状和大小。这一事实表明,微反应体系适合开发需要稳定性的体系,如乳液聚合。模型与实验结果的对比表明,这些都被模型合理地表示了。

更新日期:2021-07-09
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