Rotating electroosmotic flow of viscoplastic material between two parallel plates

Cheng, Qi; Ng, Chiu‐On

doi:10.1016/j.colsurfa.2016.10.066

Cited by 36 publications

(12 citation statements)

References 33 publications

(50 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The range of the dimensionless drag parameter α is between 0.1 and 10 [3,24,10,23]. The dimensionless rotational speed Re Ω is assumed to vary from 0 to 10 [11,20,19,16,17,21,22,23]. The value of power-law index n is assumed to be between 0.6 and 1.4.…”

Section: Parameter Selectionmentioning

confidence: 99%

“…Effect of transient and startup flow behaviour of rotational EOF has been studied analytically [12,13]. Rheological effects on the rotational EOF have been reported recently for power law fluid [14], third grade fluid [15], viscoelastic fluid [16,17], Eyring fluid [18] and viscoplastic material [19]; the papers show that rheology of the fluid significantly alters the flow behaviour of fluid in rotating EOF. In particular, Abhimanyu et al [17] show that EOF and rotational coriolis effects cannot be linearly superimposed when both are studied separately for rheologically complex fluids.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Rotating electroosmotic flow of power-law fluid through polyelectrolyte grafted microchannel

Patel¹,

Kruthiventi²,

Kaushik³

2019

Preprint

View full text Add to dashboard Cite

Due to evergrowing importance of understanding flow of bio-fluids in Lab-on-CD based systems, we investigate the flow behaviour of power-law fluids in the rotating electroosmotic flow through a polyelectrolyte grafted (soft) narrow channel. We use a in-house numerical code to solve the governing transport equations for the velocities and flow rates in a rotating channel subjected to an applied external electric field. We show the strong effect of polyelectrolyte layer on the flow behaviour and find an increase in flow rate as we increase the size of the polyelectrolyte layer. We also show that rheology strongly influences the interplay of the Coriolis forces due to rotation and electrical body force due to the applied electric field. We show that the velocities are generally higher for shear thinning fluids as compared to shear thickening fluids. We also show that presence of polymer brushes in the polyelectrolyte layer creates a drag on the fluid which reduces velocities. We elaborate that the flow rates are strongly altered by the effect of rotation and that shear thickening fluids have lower flow rates than shear thinning fluids. We believe that studying effect of fluid rheology becomes very important for designing soft channel based Lab-on-CD systems driven by electroosmotic forcing and dealing with rheologically complex bio-fluids such as blood, saliva or mucus.

show abstract

Section: Parameter Selectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rotating electroosmotic flow of power-law fluid through polyelectrolyte grafted microchannel

Patel¹,

Kruthiventi²,

Kaushik³

2019

Preprint

View full text Add to dashboard Cite

show abstract

“…The hydrodynamic behavior of EOF of different fluids is investigated in different microchannels, such as slit [5], rectangular [6,7], elliptic [8], and circular microchannels [9]. The core of the attention on EOF has shifted to the heat transfer characteristics of EOF [9,10,11], two-layer EOF [12], rotating EOF [13,14], and pressure effects on EOF [15]. In biological and chemical industries, biofluids, such as blood and DNA, solutions manipulated in microfluidic devices show nonlinear rheological behavior, such as the viscosity dependent on shear rate, which cannot be modeled by the linear constitutional relation.…”

Section: Introductionmentioning

confidence: 99%

Thermally Fully Developed Electroosmotic Flow of Power-Law Nanofluid in a Rectangular Microchannel

Deng

2019

Micromachines

View full text Add to dashboard Cite

The hydrodynamic and thermal behavior of the electroosmotic flow of power-law nanofluid is studied. A modified Cauchy momentum equation governing the hydrodynamic behavior of power-law nanofluid flow in a rectangular microchannel is firstly developed. To explore the thermal behavior of power-law nanofluid flow, the energy equation is developed, which is coupled to the velocity field. A numerical algorithm based on the Crank–Nicolson method and compact difference schemes is proposed, whereby the velocity, temperature, and Nusselt number are computed for different parameters. A larger nanoparticle volume fraction significantly reduces the velocity and enhances the temperature regardless of the base fluid rheology. The Nusselt number increases with the flow behavior index and with electrokinetic width when considering the surface heating effect, which decreases with the Joule heating parameter. The heat transfer rate of electroosmotic flow is enhanced for shear thickening nanofluids or at a greater nanoparticle volume fraction.

show abstract

“…The temperature is a weak function of the flow behavior index.Micromachines 2020, 11, 421 2 of 18 the migration of co-ions within EDL drags bulk liquid, resulting in the so-called electroosmotic flow (EOF) [4]. The recent focus on the EOF shifts from the transport characteristics of EOF in different microgeometries and for various working liquids [5-10] to rotating flows [11,12], the effects of external magnetic field [13], and pressure gradient [14] or two-layer EOF [15].Within a pressure-driven flow (PDF), the repelled co-ions in EDL are carried streamwise, inducing the streaming current and further streaming potential. For balance, the conducting current is generated under the streaming potential, and the co-ions flow back, pulling the liquid molecules in the opposite direction to the PDF because of viscous force.…”

mentioning

confidence: 99%

“…Micromachines 2020, 11, 421 2 of 18 the migration of co-ions within EDL drags bulk liquid, resulting in the so-called electroosmotic flow (EOF) [4]. The recent focus on the EOF shifts from the transport characteristics of EOF in different microgeometries and for various working liquids [5-10] to rotating flows [11,12], the effects of external magnetic field [13], and pressure gradient [14] or two-layer EOF [15].…”

mentioning

confidence: 99%

The Effect of Streaming Potential and Viscous Dissipation in the Heat Transfer Characteristics of Power-Law Nanofluid Flow in a Rectangular Microchannel

Deng

2020

Micromachines

View full text Add to dashboard Cite

The non-Newtonian nanofluid flow becomes increasingly important in enhancing the thermal management efficiency of microscale devices and in promoting the exploration of the thermal-electric energy conversion process. The effect of streaming potential and viscous dissipation in the heat transfer characteristics of power-law nanofluid electrokinetic flow in a rectangular microchannel has been investigated to assist in the development of an energy harvesting system. The electroviscous effect caused by the streaming potential influences the hydrodynamical and thermal characteristics of flow. With the change in constitutive behavior of power-law nanofluid, the viscous dissipation effect is considered. The Poisson–Boltzmann equation, the modified Cauchy momentum equation, and the energy equation were solved. The temperature and heat transfer rate were analytically expressed for Newtonian nanofluid and numerically obtained for power-law nanofluid. The interactive influence of streaming potential, viscous dissipation, and hydrodynamical features of power-law nanofluid on the heat transfer characteristics were studied. The presence of streaming potential tends to reduce the dimensionless bulk mean temperature. The introduction of nanoparticles augments dimensionless temperature difference between channel wall and bulk flow, which decreases the heat transfer rate. The shear thinning nanofluid is more sensitive to the above effects. The temperature is a weak function of the flow behavior index.

show abstract

Rotating electroosmotic flow of viscoplastic material between two parallel plates

Cited by 36 publications

References 33 publications

Rotating electroosmotic flow of power-law fluid through polyelectrolyte grafted microchannel

Rotating electroosmotic flow of power-law fluid through polyelectrolyte grafted microchannel

Thermally Fully Developed Electroosmotic Flow of Power-Law Nanofluid in a Rectangular Microchannel

The Effect of Streaming Potential and Viscous Dissipation in the Heat Transfer Characteristics of Power-Law Nanofluid Flow in a Rectangular Microchannel

Contact Info

Product

Resources

About