scholarly journals Electroosmotic Flow of Viscoelastic Fluid in a Nanoslit

Micromachines ◽  
2018 ◽  
Vol 9 (4) ◽  
pp. 155 ◽  
Author(s):  
Lanju Mei ◽  
Hongna Zhang ◽  
Hongxia Meng ◽  
Shizhi Qian
Keyword(s):  
Viscoelastic Fluid ◽  
Electroosmotic Flow

Electroosmotic flow of viscoelastic fluid through a microchannel with slip-dependent zeta potential

2021 ◽  
Vol 33 (12) ◽  
pp. 123110
Author(s):  
Kasavajhula Naga Vasista ◽  
Sumit Kumar Mehta ◽  
Sukumar Pati ◽  
Sandip Sarkar
Keyword(s):  
Zeta Potential ◽  
Viscoelastic Fluid ◽  
Electroosmotic Flow

Thermodiffusive effect on the local Debye-length in an electroosmotic flow of a viscoelastic fluid in a slit microchannel

2022 ◽  
Vol 187 ◽  
pp. 122522
Author(s):  
A. Hernández ◽  
J. Arcos ◽  
J. Martínez-Trinidad ◽  
O. Bautista ◽  
S. Sánchez ◽  
...  
Keyword(s):  
Viscoelastic Fluid ◽  
Electroosmotic Flow ◽  
Debye Length

scholarly journals Electroosmotic Flow of Viscoelastic Fluid in a Nanochannel Connecting Two Reservoirs

Micromachines ◽  
2019 ◽  
Vol 10 (11) ◽  
pp. 747 ◽  
Author(s):  
Mei ◽  
Qian
Keyword(s):  
Constitutive Model ◽  
Viscoelastic Fluid ◽  
Flow Rate ◽  
Electroosmotic Flow ◽  
Double Layers ◽  
Ionic Conductance ◽  
Electrical Double Layers ◽  
Interconnect System ◽  
First Time ◽  
Thinning Effect

: Electroosmotic flow (EOF) of viscoelastic fluid with Linear Phan-Thien–Tanner (LPTT) constitutive model in a nanochannel connecting two reservoirs is numerically studied. For the first time, the influence of viscoelasticity on the EOF and the ionic conductance in the micro-nanofluidic interconnect system, with consideration of the electrical double layers (EDLs), is investigated. Regardless of the bulk salt concentration, significant enhancement of the flow rate is observed for viscoelastic fluid compared to the Newtonian fluid, due to the shear thinning effect. An increase in the ionic conductance of the nanochannel occurs for the viscoelastic fluid. The enhancement of the ionic conductance is significant under the overlapping EDLs condition.

scholarly journals Electroosmotic Flow of Viscoelastic Fluid through a Constriction Microchannel

Micromachines ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 417
Author(s):  
Jianyu Ji ◽  
Shizhi Qian ◽  
Zhaohui Liu
Keyword(s):  
Electric Field ◽  
Newtonian Fluid ◽  
Viscoelastic Fluid ◽  
Apparent Viscosity ◽  
Applied Electric Field ◽  
Electroosmotic Flow ◽  
Microfluidic Channel ◽  
Critical Value ◽  
Poisson Boltzmann ◽  
Boltzmann Model

Electroosmotic flow (EOF) has been widely used in various biochemical microfluidic applications, many of which use viscoelastic non-Newtonian fluid. This study numerically investigates the EOF of viscoelastic fluid through a 10:1 constriction microfluidic channel connecting two reservoirs on either side. The flow is modelled by the Oldroyd-B (OB) model coupled with the Poisson–Boltzmann model. EOF of polyacrylamide (PAA) solution is studied as a function of the PAA concentration and the applied electric field. In contrast to steady EOF of Newtonian fluid, the EOF of PAA solution becomes unstable when the applied electric field (PAA concentration) exceeds a critical value for a fixed PAA concentration (electric field), and vortices form at the upstream of the constriction. EOF velocity of viscoelastic fluid becomes spatially and temporally dependent, and the velocity at the exit of the constriction microchannel is much higher than that at its entrance, which is in qualitative agreement with experimental observation from the literature. Under the same apparent viscosity, the time-averaged velocity of the viscoelastic fluid is lower than that of the Newtonian fluid.

Analysis of a Viscoelastic Fluid Flow in a Microchannel With Asymmetric Zeta Potentials Under a Combination of Electroosmotic and Magnetohydrodynamic Driven Forces

2014 ◽  
Author(s):  
Juan P. Escandón ◽  
Oscar E. Bautista ◽  
Federico Méndez
Keyword(s):  
Fluid Flow ◽  
Electric Fields ◽  
Viscoelastic Fluid ◽  
Flow Rate ◽  
Electroosmotic Flow ◽  
Future Application ◽  
Buffer Solution ◽  
Viscoelastic Parameter ◽  
Zeta Potentials ◽  
Fluid Field

In this paper an analytical solution to describe the velocity profiles and flow rate of combined electroosmotic and magnetohydrodynamic flows in a microchannel is obtained. A fully-developed flow is considered and the fluid obeys a constitutive relation based in a simplified Phan-Thien-Tanner model. Asymmetric boundary conditions with different zeta potentials at the walls are specified to provide a perturbation to the fluid flow. The effect of the dimensionless parameters on the flow field as viscoelastic parameter, the Hartmann number, the ratio of applied electric fields on the fluid field and the ratio of the wall zeta potentials is predicted. The analysis permits to establish the conditions for which the flow rate is increased respect to a purely electroosmotic flow, therefore, in the limit of small Hartmann numbers and low electrical conductivity in the buffer solution correspond to the range where the electric and magnetic effects can be used to move a charged solution in the flow control and sample handling in biomedical and chemical analysis. In addition, we determine the conditions that must be met to prevent the undesirable lateral electroosmotic flow, which is present in this kind of applications. Finally, the combined effect of asymmetric zeta potentials and electro-magnetic fields on viscoelastic fluid flows in microchannels is discussed as future application of mixed in microfluidics devices.

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