Maxwell stress-induced flow control of a free surface electro-osmotic flow in a rectangular microchannel

2013 ◽  
Vol 16 (4) ◽  
pp. 721-728 ◽  
Author(s):  
Manik Mayur ◽  
Sakir Amiroudine ◽  
Didier Lasseux ◽  
Suman Chakraborty
Keyword(s):  
Free Surface ◽  
Flow Control ◽  
Maxwell Stress ◽  
Rectangular Microchannel ◽  
Osmotic Flow ◽  
Induced Flow ◽  
Electro Osmotic Flow

scholarly journals Flow control in microfluidics devices: electro-osmotic Couette flow with joule heating effect

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
C. Ahamed Saleel ◽  
Saad Ayed Alshahrani ◽  
Asif Afzal ◽  
Maughal Ahmed Ali Baig ◽  
Sarfaraz Kamangar ◽  
...  
Keyword(s):  
Flow Control ◽  
Couette Flow ◽  
Joule Heating ◽  
Dynamic Viscosity ◽  
Microfluidic Devices ◽  
Heating Effect ◽  
Content Type ◽  
Osmotic Flow ◽  
Joule Heating Effect ◽  
Electro Osmotic Flow

PurposeJoule heating effect is a pervasive phenomenon in electro-osmotic flow because of the applied electric field and fluid electrical resistivity across the microchannels. Its effect in electro-osmotic flow field is an important mechanism to control the flow inside the microchannels and it includes numerous applications.Design/methodology/approachThis research article details the numerical investigation on alterations in the profile of stream wise velocity of simple Couette-electroosmotic flow and pressure driven electro-osmotic Couette flow by the dynamic viscosity variations happened due to the Joule heating effect throughout the dielectric fluid usually observed in various microfluidic devices.FindingsThe advantages of the Joule heating effect are not only to control the velocity in microchannels but also to act as an active method to enhance the mixing efficiency. The results of numerical investigations reveal that the thermal field due to Joule heating effect causes considerable variation of dynamic viscosity across the microchannel to initiate a shear flow when EDL (Electrical Double Layer) thickness is increased and is being varied across the channel.Originality/valueThis research work suggest how joule heating can be used as en effective mechanism for flow control in microfluidic devices.

Toward microscale flow control using non-uniform electro-osmotic flow

2018 ◽  
Author(s):  
Moran Bercovici ◽  
Federico Paratore ◽  
Evgeniy Boyko ◽  
Govind V. Kaigala ◽  
Amir Gat
Keyword(s):  
Flow Control ◽  
Osmotic Flow ◽  
Microscale Flow ◽  
Electro Osmotic Flow

Maxwell stress generated long wave instabilities in a thin aqueous film under time-dependent electro-osmotic flow

2016 ◽  
Vol 20 (4) ◽  
Author(s):  
M. Mayur ◽  
S. Amiroudine ◽  
E. A. Demekhin ◽  
G. S. Ganchenko
Keyword(s):  
Time Dependent ◽  
Maxwell Stress ◽  
Osmotic Flow ◽  
Long Wave ◽  
Wave Instabilities ◽  
Electro Osmotic Flow

Electro-Osmotic Flow Control in Microfluidics Systems

2001 ◽  
pp. 7-12
Author(s):  
R. E. Oosterbroek ◽  
M. H. Goedbloed ◽  
A. Trautmann ◽  
N. J. van der Veen ◽  
S. Schlautmann ◽  
...  
Keyword(s):  
Flow Control ◽  
Osmotic Flow ◽  
Electro Osmotic Flow

A microfluidic chip for blood plasma separation using electro-osmotic flow control

2011 ◽  
Vol 21 (8) ◽  
pp. 085019 ◽  
Author(s):  
Hai Jiang ◽  
Xuan Weng ◽  
Chan Hee Chon ◽  
Xudong Wu ◽  
Dongqing Li
Keyword(s):  
Flow Control ◽  
Blood Plasma ◽  
Microfluidic Chip ◽  
Plasma Separation ◽  
Osmotic Flow ◽  
Blood Plasma Separation ◽  
Electro Osmotic Flow

scholarly journals Electro-osmotic flow in a rotating rectangular microchannel

2015 ◽  
Vol 471 (2179) ◽  
pp. 20150200 ◽  
Author(s):  
Chiu-On Ng ◽  
Cheng Qi
Keyword(s):  
Rectangular Channel ◽  
Debye Length ◽  
Ekman Layer ◽  
Secondary Flows ◽  
Mean Flow ◽  
Rectangular Microchannel ◽  
Osmotic Flow ◽  
Zeta Potentials ◽  
Combined Action ◽  
Electro Osmotic Flow

An analytical model is presented for low-Rossby-number electro-osmotic flow in a rectangular channel rotating about an axis perpendicular to its own. The flow is driven under the combined action of Coriolis, pressure, viscous and electric forces. Analytical solutions in the form of eigenfunction expansions are developed for the problem, which is controlled by the rotation parameter (or the inverse Ekman number), the Debye parameter, the aspect ratio of the channel and the distribution of zeta potentials on the channel walls. Under the conditions of fast rotation and a thin electric double layer (EDL), an Ekman–EDL develops on the horizontal walls. This is essentially an Ekman layer subjected to electrokinetic effects. The flow structure of this boundary layer as a function of the Ekman layer thickness normalized by the Debye length is investigated in detail in this study. It is also shown that the channel rotation may have qualitatively different effects on the flow rate, depending on the channel width and the zeta potential distributions. Axial and secondary flows are examined in detail to reveal how the development of a geostrophic core may lead to a rise or fall of the mean flow.

Steady electro-osmotic flow of a micropolar fluid in a microchannel

2008 ◽  
Vol 465 (2102) ◽  
pp. 501-522 ◽  
Author(s):  
Abuzar A Siddiqui ◽  
Akhlesh Lakhtakia
Keyword(s):  
Micropolar Fluid ◽  
Couple Stress ◽  
Numerical Solutions ◽  
Debye Length ◽  
Analytic Solutions ◽  
Rectangular Microchannel ◽  
Micropolar Fluids ◽  
One Dimensional ◽  
Osmotic Flow ◽  
Electro Osmotic Flow

We have formulated and solved the boundary-value problem of steady, symmetric and one-dimensional electro-osmotic flow of a micropolar fluid in a uniform rectangular microchannel, under the action of a uniform applied electric field. The Helmholtz–Smoluchowski equation and velocity for micropolar fluids have also been formulated. Numerical solutions turn out to be virtually identical to the analytic solutions obtained after using the Debye–Hückel approximation, when the microchannel height exceeds the Debye length, provided that the zeta potential is sufficiently small in magnitude. For a fixed Debye length, the mid-channel fluid speed is linearly proportional to the microchannel height when the fluid is micropolar, but not when the fluid is simple Newtonian. The stress and the microrotation are dominant at and in the vicinity of the microchannel walls, regardless of the microchannel height. The mid-channel couple stress decreases, but the couple stress at the walls intensifies, as the microchannel height increases and the flow tends towards turbulence.

Electro-osmotic flow control for living cell analysis in microfluidic PDMS chips

2009 ◽  
Vol 36 (1) ◽  
pp. 75-81 ◽  
Author(s):  
Tomasz Glawdel ◽  
Carolyn L. Ren
Keyword(s):  
Flow Control ◽  
Living Cell ◽  
Cell Analysis ◽  
Osmotic Flow ◽  
Electro Osmotic Flow

Effect of interfacial Maxwell stress on time periodic electro-osmotic flow in a thin liquid film with a flat interface

2013 ◽  
Vol 35 (5) ◽  
pp. 670-680 ◽  
Author(s):  
Manik Mayur ◽  
Sakir Amiroudine ◽  
Didier Lasseux ◽  
Suman Chakraborty
Keyword(s):  
Liquid Film ◽  
Thin Liquid Film ◽  
Maxwell Stress ◽  
Osmotic Flow ◽  
Flat Interface ◽  
Time Periodic ◽  
Electro Osmotic Flow
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