Numerical investigation of using micropolar fluid model for EHD flow through a smooth channel

Moayedi, Hesam; Amanifard, Nima; Deylami, Hamed Mohaddes; Dolati, Farid

doi:10.1016/j.elstat.2017.03.006

Cited by 13 publications

(3 citation statements)

References 25 publications

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“…In this study, u in equation ( 5) is discarded because the u is two orders of magnitude lower than u i [29]. D i ∇q i in equation ( 5) is also omitted because the diffusive motion of ions is influential only in microscopic-scale applications [30]. Therefore, equation ( 5) reduces to j ≈ μ i Eq i ( 6)…”

Section: Governing Equationsmentioning

confidence: 99%

Numerical investigation of the separation mechanism in an electrostatic aerosol-to-hydrosol separator by glow corona discharge: a quantitative comparison of the effects of ionic wind and Coulomb force

Kim

Hwang

2020

Plasma Sources Sci. Technol.

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Electrostatic separation of particles from air onto a liquid surface has attracted increasing attention for various applications such as wet electrostatic precipitators and bioaerosol samplers. In this study, the electrostatic separation of particles onto the liquid surface is numerically modeled in a simplified manner. The simulated separation efficiency is validated by experimental values reported in literature. The effects of ionic wind and Coulombic force on particle separation for various electrical mobilities, applied voltages, and air flow rates are studied by decomposing the total separation efficiency into two components: Coulombic and ionic-wind separation efficiencies. Both Coulombic and ionic-wind separation efficiencies show the same behaviors as the total separation efficiency with changes in the operating conditions: they increase with increasing applied voltage and particle electrical mobility, and with decreasing air flow rate. Overall, the ionic-wind separation efficiency is higher than the Coulombic separation efficiency, mainly because of the short residence time. However, when the applied voltage and particle electrical mobility are high, and the air flow rate is low, the Coulombic force outperforms the ionic wind. Time-scale analysis well explains the relations between the relative importance of each separation mechanism and the operating parameters.

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Section: Governing Equationsmentioning

confidence: 99%

Numerical investigation of the separation mechanism in an electrostatic aerosol-to-hydrosol separator by glow corona discharge: a quantitative comparison of the effects of ionic wind and Coulomb force

Kim

Hwang

2020

Plasma Sources Sci. Technol.

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“…Lopez et al added entropy generation analysis with thermal radiation, slip flow and radiative boundary condition for MHD nanofluid flow in a porous vertical channel. Electrohydrodynamic flow through a smooth channel and MHD oscillatory flow of Jeffrey fluid in a vertical porous channel with viscous dissipation were examined numerically by Selvi et al Mosayebidorcheh et al and Hayat et al investigated the MHD effect on peristaltic nanofluid flow, whereas Jha et al examined the effect of induced magnetic field with natural convection.…”

Section: Introductionmentioning

confidence: 99%

Magnetohydrodynamic bio‐nanoconvective Naiver slip flow of micropolar fluid in a stretchable horizontal channel

Zohra

Uddin

Ismail

2019

Heat Trans. Asian Res.

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The purpose of this paper is to formulate and analyze a nano-bio transport model for magnetohydrodynamic convective flow, heat, and mass diffusion of micropolar fluid containing gyrotactic microorganisms through a horizontal channel. Both the walls are considered to be stretched, and the Navier slip boundary condition is taken into account. The governing bio-nano transport partial differential equations are rendered to ordinary differential equations using similarity variables. The resulting normalized self-similar boundary value problem is solved computationally with the Matlab bvp4c function. The effect of the controlling parameters on the nondimensional velocity, temperature, nanoparticle concentration, and motile microorganism density functions, and their gradients at the wall are visualized graphically and in a tabular form and expounded at length. Validation with a previous simpler model is included. All physical quantities, except the local Nusselt number, increases with an increase in the velocity slip and magnetic parameters. The present problem finds applications in industries related to pharmaceutical, nanofluidic devices, microbial enhanced oil recovery, modeling oil, and gas-bearing sedimentary basins.

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“…Micro/minichannel heat sinks with various active and passive techniques are widely used as cooling systems due to its high surface area to volume ratio [2]. Electrohydrodynamics (EHD) based techniques have gained popularity in recent years as a suitable active method for heat transfer enhancement because of its quick response and simple design [3]. The effect of one such EHD phenomenon called the Onsager-Wien effect in heat transfer enhancement is explored in the present study.A 3D minichannel undergoing conjugate heat transfer along with an external electric field that can trigger the onset of the Onsager-Wien effect is numerically analysed.…”

mentioning

confidence: 99%

Numerical Investigation of Electrode Configuration in Heat Transfer Enhancement Caused by Onsager-Wien Effect in a Minichannel

Vishnu,

Vengadesan,

Selvakumar

2023

Proceedings of the 9th World Congress on Mechanical, Chemical, and Material Engineering

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Rapid developments in miniaturization technologies have led to the development of compact and high-power density electronic devices [1]. An effective and flexible thermal management system is vital to ensure the reliability of these highperformance electronic systems. Micro/minichannel heat sinks with various active and passive techniques are widely used as cooling systems due to its high surface area to volume ratio [2]. Electrohydrodynamics (EHD) based techniques have gained popularity in recent years as a suitable active method for heat transfer enhancement because of its quick response and simple design [3]. The effect of one such EHD phenomenon called the Onsager-Wien effect in heat transfer enhancement is explored in the present study.A 3D minichannel undergoing conjugate heat transfer along with an external electric field that can trigger the onset of the Onsager-Wien effect is numerically analysed. A series of flat plate electrodes flushed on the walls of the fluid passage is used to impart an electric field in the system. Different electrode configurations are considered in the present study by varying the inter-electrode distance. The governing equations of the problem, Navier-Stokes equation, energy equation and charge transport equation are incorporated into the OpenFOAM framework and numerically solved.The interaction between flow field and the electric field leads to the formation of a unique steady state flow structure in the system. Localized high velocity zones and eddies are formed in the vicinity of the electrodes. These secondary flow structures act as a disturbance to the primary external flow leading to the disruption of velocity and thermal boundary layers accounting for the enhanced mixing in the system. The nature of the vortex generated from each electrode configuration is studied. These configurations are compared to understand the mechanism of heat transfer enhancement both qualitatively and quantitatively. The net heat transfer rate of the minichannel is quantified by the average Nusselt number. A 50% increment in the average Nusselt number is observed with EHD assisted forced convection process. The thermal hydraulic performance factor (THPF) is analyzed to study the overall effectiveness of the heat sink. THPF greater than 1 signifies an effective heat sink, and a maximum THPF value of 1.32 is obtained here using the additional electric body force. The results of this study indicates that the introduction of an external electric field in the system can augment the heat transfer in all electrode configurations with a minimal usage of additional power source.

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Numerical investigation of using micropolar fluid model for EHD flow through a smooth channel

Cited by 13 publications

References 25 publications

Numerical investigation of the separation mechanism in an electrostatic aerosol-to-hydrosol separator by glow corona discharge: a quantitative comparison of the effects of ionic wind and Coulomb force

Numerical investigation of the separation mechanism in an electrostatic aerosol-to-hydrosol separator by glow corona discharge: a quantitative comparison of the effects of ionic wind and Coulomb force

Magnetohydrodynamic bio‐nanoconvective Naiver slip flow of micropolar fluid in a stretchable horizontal channel

Numerical Investigation of Electrode Configuration in Heat Transfer Enhancement Caused by Onsager-Wien Effect in a Minichannel

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