Particle separation using modified Taylor’s flow

IF 2.3 4区 工程技术 Q2 INSTRUMENTS & INSTRUMENTATION
Vivek Kumar, Palak Jain, Ravi Kant Upadhyay, K. S. Bharath, Prashant R. Waghmare
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Abstract

In this study, the separation of micron-size particles from a liquid slug is achieved by using a passive mechanism through Taylor’s flow. We have exploited the recirculation of a fluid along the travelling air–liquid interfaces to align particles in a streamline. Recirculation of concentrated particles is achieved along the centre of the microchannel that aligns with the maximum velocity plane across the channel. The microchannel is fabricated through a four-step manufacturing process to achieve the necessary dimensions and surface chemistry along the side wall of the microchannel. For a flow of liquid, a fully developed flow regime can be witnessed by observing the parabolic velocity profile. The symmetric profile with maximum velocity along the center line of the channel is a depiction of the no-slip boundary at the channel wall. A liquid-repellent solid wall, or a superhydrophobic solid wall, changes the parabolic profile and subsequently, the magnitude and position of maximum velocity changes. Along a channel with one wall of superhydrophobic coating, the profile becomes asymmetric and the shifts location of the maximum velocity from the center of the channel. After introducing a bubble of the same size as the channel width, the bubble also experiences this asymmetry. As famously Taylor flow depicts, the traveling bubble concentrates the particles along a maximum velocity profile which is along the center of the channel towards the wall with slp condition. However, for one wall with slip condition, it facilitates the shift of the stream of particles on the desired side of the center of the channel. This shift is used to guide particles towards one arm of the Y section of the channel located downstream of the flow. To demonstrate this shift in the particle stream, we conducted experiments along two different channels: one with no slip condition, and the second with a coating that exhibits slip condition along the wall.

Abstract Image

用改进的泰勒流进行粒子分离
在这项研究中,微米级颗粒与液体段塞流的分离是通过泰勒流的被动机制实现的。我们利用流体沿流动的气液界面的再循环,使粒子排列成流线。浓缩颗粒的再循环沿着微通道的中心实现,该微通道与通道上的最大速度平面对齐。微通道是通过四步制造工艺制造的,以实现必要的尺寸和表面化学沿着微通道的侧壁。对于液体流动,通过观察抛物线速度分布可以看到一个完全发育的流动型态。沿通道中心线的最大速度对称剖面是通道壁上无滑移边界的描述。拒液固体壁或超疏水固体壁改变了抛物线轮廓,随后,最大速度的大小和位置发生了变化。在有一壁超疏水涂层的通道上,通道轮廓变得不对称,最大速度的位置从通道中心偏移。在引入与通道宽度相同大小的气泡后,气泡也会经历这种不对称。正如著名的泰勒流所描述的那样,在滑移条件下,行进的气泡沿着最大速度剖面沿着通道中心向壁面集中颗粒。然而,对于具有滑移条件的壁面,它有利于颗粒流在通道中心所需一侧的移动。这种位移被用来引导粒子流向位于水流下游的通道Y截面的一个臂。为了证明粒子流中的这种转变,我们沿着两个不同的通道进行了实验:一个没有滑移条件,另一个沿着壁面有滑移条件的涂层。
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来源期刊
Microfluidics and Nanofluidics
Microfluidics and Nanofluidics 工程技术-纳米科技
CiteScore
4.80
自引率
3.60%
发文量
97
审稿时长
2 months
期刊介绍: Microfluidics and Nanofluidics is an international peer-reviewed journal that aims to publish papers in all aspects of microfluidics, nanofluidics and lab-on-a-chip science and technology. The objectives of the journal are to (1) provide an overview of the current state of the research and development in microfluidics, nanofluidics and lab-on-a-chip devices, (2) improve the fundamental understanding of microfluidic and nanofluidic phenomena, and (3) discuss applications of microfluidics, nanofluidics and lab-on-a-chip devices. Topics covered in this journal include: 1.000 Fundamental principles of micro- and nanoscale phenomena like, flow, mass transport and reactions 3.000 Theoretical models and numerical simulation with experimental and/or analytical proof 4.000 Novel measurement & characterization technologies 5.000 Devices (actuators and sensors) 6.000 New unit-operations for dedicated microfluidic platforms 7.000 Lab-on-a-Chip applications 8.000 Microfabrication technologies and materials Please note, Microfluidics and Nanofluidics does not publish manuscripts studying pure microscale heat transfer since there are many journals that cover this field of research (Journal of Heat Transfer, Journal of Heat and Mass Transfer, Journal of Heat and Fluid Flow, etc.).
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