Vivek Kumar, Palak Jain, Ravi Kant Upadhyay, K. S. Bharath, Prashant R. Waghmare
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引用次数: 0
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.
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.).