Combined effects of streaming potential and wall slip on flow and heat transfer in microchannels

Tan, Dekun; Liu, Y.

doi:10.1016/j.icheatmasstransfer.2014.02.009

Cited by 31 publications

(8 citation statements)

References 19 publications

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“…Additionally, the roughness-induced boundary slip can also affect the convective heat transfer by changing the flow behavior. Though the effect of boundary slip on the convective heat transfer has been widely studied [ 38 , 39 , 40 , 41 , 42 , 43 ], the coupled effect of surface roughness and roughness-induced boundary slip on the convective heat transfer is still lacked. The change of the convective heat transfer with different surface roughness should be considered comprehensively.…”

Section: Introductionmentioning

confidence: 99%

Effective Boundary Slip Induced by Surface Roughness and Their Coupled Effect on Convective Heat Transfer of Liquid Flow

Pan

Jing

Zhang

et al. 2018

Entropy

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As a significant interfacial property for micro/nano fluidic system, the effective boundary slip can be induced by the surface roughness. However, the effect of surface roughness on the effective slip is still not clear, both increased and decreased effective boundary slip were found with increased roughness. The present work develops a simplified model to study the effect of surface roughness on the effective boundary slip. In the created rough models, the reference position of the rough surfaces to determinate effective boundary slip was set based on ISO/ASME standard and the surface roughness parameters including Ra (arithmetical mean deviation of the assessed profile), Rsm (mean width of the assessed profile elements) and shape of the texture varied to form different surface roughness. Then, the effective boundary slip of fluid flow through the rough surface was analyzed by using COMSOL 5.3. The results show that the effective boundary slip induced by surface roughness of fully wetted rough surface keeps negative and further decreases with increasing Ra or decreasing Rsm. Different shape of roughness texture also results in different effective slip. A simplified corrected method for the measured effective boundary slip was developed and proved to be efficient when the Rsm is no larger than 200 nm. Another important finding in the present work is that the convective heat transfer firstly increases followed by an unobvious change with increasing Ra, while the effective boundary slip keeps decreasing. It is believed that the increasing Ra enlarges the area of solid-liquid interface for convective heat transfer, however, when Ra is large enough, the decreasing roughness-induced effective boundary slip counteracts the enhancement effect of roughness itself on the convective heat transfer.

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Section: Introductionmentioning

confidence: 99%

Effective Boundary Slip Induced by Surface Roughness and Their Coupled Effect on Convective Heat Transfer of Liquid Flow

Pan

Jing

Zhang

et al. 2018

Entropy

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“…It is experimentally and theoretically found that the fluidic transportation and heat transfer in the micro/nanoscale deviate significantly from those in macroscale. The interfacial properties, such as surface charge [5][6][7][8], nanobubbles [9,10], boundary slip [11,12] and surface texture and roughness [13], have been widely studied to explain the derivation of fluidic transportation and heat transfer in the micro/ nanoscale and in the macroscale. The present work focuses on the effect of surface charge and boundary slip on the fluid flow and convective heat transfer in the micro/nanoscale.…”

Section: Introductionmentioning

confidence: 99%

“…Considering the convective heat transfer of the fluid flow is related to the fluidic behavior, thus, the existence of surface charge and boundary slip inevitably affect the convective heat transfer of fluid flow in a micro/nanofluidic system by affecting the fluidic behavior. Both the separate effects and the combined effect of EDL and boundary slip on the fluid flow and convective heat transfer in the micro/ nanoscale have been widely studied [5][6][7][8]11,13,[20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Electroviscous effect and convective heat transfer of pressure-driven flow through microtubes with surface charge-dependent slip

Jing

Pan

2016

International Journal of Heat and Mass Transfer

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“…They observed an increase in the induced voltage significantly with velocity slip at the wall Zhao and Yang (2011). andTan and Liu (2014) have explored the combined influences of the streaming potential and hydrodynamics slip on the pressure-driven flow and heat transfer in the planar microchannel. They reported that the apparent viscosity ratio (competition between the streaming potential and the slip effects) which below unity when slip dominates and above one when streaming potential dominates.…”

mentioning

confidence: 99%

Charge-dependent slip flow of ionic liquids through the non-uniform microfluidic device: pressure drop and electroviscous effects

Dhakar,

Bharti

2022

Preprint

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This work investigates the electroviscous effects in the presence of the charge-dependent slip in the steady pressure-driven laminar flow of the symmetric (1:1) electrolytes liquid through a uniformly charged rectangular contraction -expansion (4:1:4) microfluidic device. The mathematical model comprising the Poison, the Nernst-Plank, the Navier-Stokes, and the current continuity equations are solved numerically using the finite element method (FEM). The flow fields (electrical potential, charge, induced electric field strength, pressure drop, and electroviscous correction factor) have been obtained and presented for the wide range of the governing parameters like inverse Debye length (2 ≤ K ≤ 20), surface charge density (4 ≤ S ≤ 16) and the slip length (0 ≤ B 0 ≤ 0.20) at fixed Schmidt number (Sc = 1000) and low Reynolds number (Re = 0.01). The flow fields have shown complex dependence on the governing parameters. The charge-dependent slip has further enhanced the complexity of the dependency in comparison to the no-slip condition. In the presence of charge-dependent slip, the total electrical potential and pressure drop changes maximally by 78% and 63%, respectively, over the ranges of conditions. The electroviscous correction factor (Y) increases by 22% under the no-slip (B 0 = 0) condition. In contrast, the electroviscous correction factor (Y) increases by 19 -72% for charge-dependent slip than that in the no-slip flow for the considered ranges of the conditions. A simple analytical model to estimate the pressure drop in the electroviscous flow, developed based on the Poiseuille flow in the individual uniform sections and pressure loss due to orifice, overpredicts the pressure drop by 2-4%. Finally, the predictive relations, depicting the functional dependence of the numerical results on the governing parameters, are presented for their practical use in the design and engineering of microfluidic devices.

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Combined effects of streaming potential and wall slip on flow and heat transfer in microchannels

Cited by 31 publications

References 19 publications

Effective Boundary Slip Induced by Surface Roughness and Their Coupled Effect on Convective Heat Transfer of Liquid Flow

Effective Boundary Slip Induced by Surface Roughness and Their Coupled Effect on Convective Heat Transfer of Liquid Flow

Electroviscous effect and convective heat transfer of pressure-driven flow through microtubes with surface charge-dependent slip

Charge-dependent slip flow of ionic liquids through the non-uniform microfluidic device: pressure drop and electroviscous effects

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