微流控
材料科学
机械
几何学
纳米技术
下降(电信)
毛细管数
流量(数学)
流动聚焦
雷诺数
气泡
频道(广播)
光学
聚结(物理)
物理
数学
工程类
电气工程
作者
O. Sartipzadeh,Seyed Morteza Naghib,Amir Seyfoori,Mehdi Rahmanian,Fatemeh Sadat Fateminia
标识
DOI:10.1016/j.msec.2019.110606
摘要
Droplet–based microfluidic assisted devices have proposed an extensive interest in many applications such as lab-on-a-chip technologies as well as chemical/biological/nanomaterial preparation, chemical engineering, drug delivery, tissue engineering and biosensing. Here, a computational fluid dynamic model was developed for deep understanding of the droplet size and formation in a flow-focusing (FF) microchannel with consideration of the continuous phase (non–Newtonian fluid). The simulations presented an alternative method to achieve insights into this complicated process. In the following for the first time, the role of channel geometry, channel aspect ratio and flow rate ratio on droplet features including the mechanism of droplet formation, diameter/volume of droplet, velocity/amount of droplet formation, and final shape/size of the generated droplets were fully described. These findings could remarkably derive desirable protocols to control droplets characteristics comprising their size and shape in non–Newtonian fluids. Moreover, level set (LS) method was used for scrutinizing the droplet-breaking procedure in the microfluidic FF devices. The results showed that different droplet sizes could be prepared with changing the various parameters, demonstrating many challenges in various applications including lab-on-a-chip, cell encapsulation, drug delivery, tissue engineering, biosensing and bioimaging could be successfully addressed.
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