Entropy Analysis of an MHD Synthetic Cilia Assisted Transport in a Microchannel Enclosure with Velocity and Thermal Slippage Effects

Munawar, Sufian; Saleem, Najma

doi:10.3390/coatings10040414

Cited by 24 publications

(18 citation statements)

References 42 publications

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“…where (𝑈 , 𝑉 ) and (𝑢 , 𝑣̅ ) are the velocity vector in fixed and moving frames, respectively. The channel wall surface is described as [39,40]:…”

Section: Physical Quantities Base Liquid Solid Nanoparticles Propertiesmentioning

confidence: 99%

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Significance of Synthetic Cilia and Arrhenius Energy on Double Diffusive Stream of Radiated Hybrid Nanofluid in Microfluidic Pump under Ohmic Heating: An Entropic Analysis

Saleem

Munawar

2021

Coatings

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This study investigates the thermal aspects of magnetohydrodynamic double diffusive flow of a radiated Cu-CuO/Casson hybrid nano-liquid through a microfluidic pump in the presence of electroosmosis effects. Shared effects of the Arrhenius activation energy and the Joule heating on the intended liquid transport are also incorporated. The inner wall of the pump is covered with electrically charged fabricated cilia mat that facilitates flow actuation and micro-mixing process. The governing equations for the proposed problem are simplified by utilizing the Debye-Hückel and lubrication approximations. The numerical solutions are calculated with the aid of shooting technique. The analysis reports that the substantial effects of electroosmosis contribute an important role in cooling process. Existence of electric double layer stimulates an escalation in liquid stream in the vicinity of the pump surface. The Arrhenius energy input strengthens the mass dispersion and regulates the thermal treatment. The proposed geometry delivers a deep perception that fabricated cilia in electroosmotic pumps are potential pharmaceutical micromixers for an effective flow and minimum entropy generation rate.

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“…where (𝑈 , 𝑉 ) and (𝑢 , 𝑣̅ ) are the velocity vector in fixed and moving frames, respectively. The channel wall surface is described as [39,40]:…”

Section: Physical Quantities Base Liquid Solid Nanoparticles Propertiesmentioning

confidence: 99%

“…In component form, Equations ( 1)-( 4) in the laboratory frame may be written as: The channel wall surface is described as [39,40]:…”

Section: Physical Quantities Base Liquid Solid Nanoparticles Propertiesmentioning

confidence: 99%

Significance of Synthetic Cilia and Arrhenius Energy on Double Diffusive Stream of Radiated Hybrid Nanofluid in Microfluidic Pump under Ohmic Heating: An Entropic Analysis

Saleem

Munawar

2021

Coatings

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“…Using a rectangular coordinate system, the X-axis is taken along the parallel direction of wave transmission, and the Y-axis is perpendicular to it (see Figure 1 for instance). The shape of wall surface lining cilia is described as [39,42]:…”

Section: Mathematical Formulationmentioning

confidence: 99%

“…Hayat et al [36,37] presented the slip effects on peristalsis in an asymmetric channel. Some important studies reporting the significance of slip-on physiological flows are listed here for interested readers [38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Significance of Slippage and Electric Field in Mucociliary Transport of Biomagnetic Fluid

Munawar

2021

Lubricants

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Shear stress at the cilia wall is considered as an imperative factor that affects the efficiency of cilia beatings as it describes the momentum transfer between the fluid and the cilia. We consider a visco-inelastic Prandtl fluid in a ciliated channel under electro-osmotic pumping and the slippage effect at cilia surface. Cilia beating is responsible for the stimulation of the flow in the channel. Evenly distributed cilia tend to move in a coordinated rhythm to mobilize propulsive metachronal waves along the channel surface by achieving elliptic trajectory movements in the flow direction. After using lubrication approximations, the governing equations are solved by the perturbation method. The pressure rise per metachronal wavelength is obtained by numerically integrating the expression. The effects of the physical parameters of interest on various flow quantities, such as velocity, pressure gradient, pressure rise, stream function, and shear stress at the ciliated wall, are discussed through graphs. The analysis reveals that the axial velocity is enhanced by escalating the Helmholtz–Smoluchowski velocity and the electro-osmosis effects near the elastic wall. The shear stress at the ciliated boundary elevates with an increase in the cilia length and the eccentricity of the cilia structure.

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“…An interesting contribution divulging the thermal analysis of Cu-water nano-liquid in a tube was given by Akbar and Butt [ 30 ]. Recently, a bio-magnetic liquid transport considering heat transfer aspect was studied by Saleem and Munawar [ 31 ].…”

Section: Introductionmentioning

confidence: 99%

Entropy Production in Electroosmotic Cilia Facilitated Stream of Thermally Radiated Nanofluid with Ohmic Heating

et al. 2021

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No thermal process, even the biological systems, can escape from the long arms of the second law. All living things preserve entropy since they obtain energy from the nutrition they consume and gain order by producing disorder. The entropy generation in a biological and thermally isolated system is the main subject of current investigation. The aim is to examine the entropy generation during the convective transport of a ciliated nano-liquid in a micro-channel under the effect of a uniform magnetic field. Joint effects of electroosmosis and thermal radiation are also brought into consideration. To attain mathematical simplicity, the governing equations are transformed to wave frame where the inertial parts of the transport equations are dropped with the use of a long-wavelength approximation. This finally produces the governing equations in the form of ordinary differential equations which are solved numerically by a shooting technique. The analysis reports that the cilia motion contributes to enhance the flow and heat transfer phenomena. An enhancement in the flow is observed near the channel surface for higher cilia length and for smaller values of the electroosmotic parameter. The entropy generation in the ciliated channel is observed to be lessened by intensifying the thermal radiation and decreasing the Ohmic heating. The extended and flexible cilia structure contributes to augment the volumetric flow rate and to drop the total entropy generation in the channel.

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Entropy Analysis of an MHD Synthetic Cilia Assisted Transport in a Microchannel Enclosure with Velocity and Thermal Slippage Effects

Cited by 24 publications

References 42 publications

Significance of Synthetic Cilia and Arrhenius Energy on Double Diffusive Stream of Radiated Hybrid Nanofluid in Microfluidic Pump under Ohmic Heating: An Entropic Analysis

Significance of Synthetic Cilia and Arrhenius Energy on Double Diffusive Stream of Radiated Hybrid Nanofluid in Microfluidic Pump under Ohmic Heating: An Entropic Analysis

Significance of Slippage and Electric Field in Mucociliary Transport of Biomagnetic Fluid

Entropy Production in Electroosmotic Cilia Facilitated Stream of Thermally Radiated Nanofluid with Ohmic Heating

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