Simulation of thermal radiation in a micropolar fluid flow through a porous medium between channel walls

Ahmad, Sohail; Ashraf, Muhammad; Ali, Kashif

doi:10.1007/s10973-020-09542-w

Cited by 62 publications

(26 citation statements)

References 42 publications

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“…The effects of physical parameters against the dimensionless temperature, velocity, surface drag and local Nusselt number are computed numerically and analyzed through graphs and tables. We specify values of the parameters rather than assigning the particular values and the domain dimensions to the paramers 36 , 37 . The fixed values of the parameters in numerical calculations are: , , , , , , , , , , , , , and otherwise specified.…”

Section: Resultsmentioning

confidence: 99%

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Features of Cu and TiO2 in the flow of engine oil subject to thermal jump conditions

Ahmad

Ali

Nisar

et al. 2021

Sci Rep

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The recent work investigates the heat transfer attributes in the flow of engine oil which comprises of nano-particles such as Cu and TiO2. The performance of Copper and Titanium oxide is over looked in the flow of engine oil. The energy equation is amended by the features of thermal radiation, viscous dissipation, and heat generation. The mathematical model signifies the porosity, entropy generation and moving flat horizontal surface with the non-uniform stretching velocity. Quasi-linearization, which is a persuasive numerical technique to solve the complex coupled differential equations, is used to acquire the numerical solution of the problem. Flow and heat transfer aspects of Cu–TiO2 in the flow are examined against the preeminent parameters. The flow is significantly affected by the thermal jump conditions and porous media. It is observed here that the temperature as well as heat transport rate is reduced with the effect of involved preeminent parameters. However, such fluids must be used with caution in applications where a control on the heat transfer is required. We may conclude that the recent study will provide assistance in thermal cooling systems such as engine and generator cooling, nuclear system cooling, aircraft refrigeration system, and so forth.

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Section: Resultsmentioning

confidence: 99%

“…For this purpose, we formulate the sequences of the transformed functions , which iteratively converge to the approximate solution of the dimensionless system. For details, see our earlier work 32 – 35 .…”

Section: Methodsmentioning

confidence: 99%

Features of Cu and TiO2 in the flow of engine oil subject to thermal jump conditions

Ahmad

Ali

Nisar

et al. 2021

Sci Rep

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“…The parameters of the problem are the porosity parameter

P_{0},

the Prandtl number

\Pr,

the heat generation parameter

H_{0},

the suction parameter

S_{0},

the magnetic parameter

M_{0},

the induced magnetic field parameter

β,

and the reciprocal magnetic Prandtl number

λ_{0} .

These parameters are all dimensionless groups of material and flow properties, and/or geometric dimensions of the domain. The traditional way (eg, Lok et al 39 and Ahmad et al 40,41 ) of studying flow and thermal characteristics of the fluid dynamics problems is to specify the values of these dimensionless groups rather than specifying the particular fluid properties and the domain dimensions. Obviously, the results obtained in this way are applicable to the flow problems with particular values of material properties and the dimensions of the domain, falling in the ranges considered in the studies.…”

Section: Resultsmentioning

confidence: 99%

Simulation analysis of MHD hybrid CuAl ₂ O ₃ /H ₂ O nanofluid flow with heat generation through a porous media

et al. 2021

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Summary Hybrid nanoliquids comprise of better physical strength, mechanical resistance, thermal conductivity, and chemical stability as equated to individual nanoliquids. The present work investigates the MHD laminar flow, containing hybrid nanoparticles, with heat transfer phenomenon over a stretching sheet immersed in a porous medium. The effect of induced magnetic field has also been taken into account. The flow model PDEs are rehabilitated into ordinary ones using a persuasive tool of similarity variables. The analogous system of dimensionless equations alongside the boundary conditions is numerically treated with the Successive‐Over‐Relaxation (SOR) technique. Flow and heat transfer aspects of both pure and hybrid nanofluids are examined for the preeminent parameters. Our outcomes are associated with the previously accomplished experimental and numerical results, and found to be in a good agreement with them. As a major outcome of the study, it has been noted that, apart from their well‐reported thermal characteristics, hybrid nanofluids are capable of raising the shear stress to remarkably higher levels (upto 57% in some cases). Therefore, such fluids must be used with caution in applications where a control on the shear stress is required.

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“…It is better to examine fluid flow, mass and heat transport characteristics by assigning the values to the preeminent parameters instead of using particular domain dimensions and fluid properties; so that, the values of parameters may be adjusted in factual applications of the present work (please see Ahmad et al. [ 32 ]). Therefore, fixed values are assigned to the parameters like

and

otherwise specified (in plots).…”

Section: Resultsmentioning

confidence: 99%

Bioconvection due to gyrotactic microbes in a nanofluid flow through a porous medium

Ahmad

Ashraf

Ali

2020

Heliyon

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The addition of gyrotactic microbes in the nanoparticles is essential to embellish the thermal efficiency of many systems such as microbial fuel cells, bacteria powered micro-mixers, micro-volumes like microfluidics devices, enzyme biosensor and chip-shaped microdevices like bio-microsystems. Porous media also plays a pivotal role in augmentation of the thermal efficiency. Our approach in the present work is to offer a novel study of bioconvection due to gyrotactic microbes in a nanofluid flow comprising thermal radiation within a porous media over a nonlinear shrinking/stretching surface. The entire coupled system involving nonlinear equations is tackled by means of Successive over Relaxation technique. The impacts of the involved parameters on the flow, motile microbes diffusion rate, mass and heat transfer rates are examined and shown through diagrams and tables. Comparisons with graphical and tabular data are provided and observed to be in a good agreement. Numerical results evidently point out that the motile microbes parameter and the bioconvection Peclet number elevate the motile microorganisms’ density whereas the thermal radiation phenomenon enhances the temperature.

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Simulation of thermal radiation in a micropolar fluid flow through a porous medium between channel walls

Cited by 62 publications

References 42 publications

Features of Cu and TiO2 in the flow of engine oil subject to thermal jump conditions

Features of Cu and TiO2 in the flow of engine oil subject to thermal jump conditions

Simulation analysis of MHD hybrid CuAl ₂ O ₃ /H ₂ O nanofluid flow with heat generation through a porous media

Bioconvection due to gyrotactic microbes in a nanofluid flow through a porous medium

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Simulation of thermal radiation in a micropolar fluid flow through a porous medium between channel walls

Cited by 62 publications

References 42 publications

Features of Cu and TiO2 in the flow of engine oil subject to thermal jump conditions

Features of Cu and TiO2 in the flow of engine oil subject to thermal jump conditions

Simulation analysis of MHD hybrid CuAl 2 O 3 /H 2 O nanofluid flow with heat generation through a porous media

Bioconvection due to gyrotactic microbes in a nanofluid flow through a porous medium

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Simulation analysis of MHD hybrid CuAl ₂ O ₃ /H ₂ O nanofluid flow with heat generation through a porous media