Entropy Generation on MHD Casson Nanofluid Flow over a Porous Stretching/Shrinking Surface

Jia, Qingxuan; Bhatti, Muhammad Mubashir; Abbas, Munawwar Ali; Rashidi, Majid; Ali, Mohamed E.A.

doi:10.3390/e18040123

Cited by 190 publications

(89 citation statements)

References 31 publications

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“…This study was later extended to the configurations including rotating porous discs with ordinary fluids [33] and nanofluid [34]. In addition to these studies, there exists a series of studies on entropy generation by nanofluid flow over permeable surfaces [35][36][37]. Although mathematical models similar to those of porous media are used in these works, the physical differences between them and stagnation flows inside porous media are rather significant.…”

Section: Introductionmentioning

confidence: 99%

Mixed convection and thermodynamic irreversibilities in MHD nanofluid stagnation-point flows over a cylinder embedded in porous media

Alizadeh

Karimi

Arjmandzadeh

et al. 2018

J Therm Anal Calorim

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The impingement of CuO-water nanofluid flows upon a cylinder subject to a uniform magnetic field with constant surface temperature and embedded in porous media is investigated for the first time in literature. The surface of the cylinder can feature uniform or non-uniform mass transpiration and is hotter than the incoming nanofluid flow. The gravitational effects are taken into account and the three-dimensional governing equations of mixed convection in curved porous media, under magnetohydrodynamic effects, are reduced to those solvable by a finite difference scheme. Through varying a mixed convection parameter, the situations dominated by forced, mixed and free convection are examined systematically. The numerical solutions of these equations reveal the flow velocity and temperature fields as well as the Nusselt number and induced shear stress. These are then used to calculate the rate of entropy generation within the system by viscous and heat transfer irreversibilities. The results show that Nusselt number increases with increasing the concentration of nanoparticles, while it slightly deceases through intensifying the magnetic parameter. Non-uniform transpiration is shown to strongly affect the average rate of heat transfer. Importantly, it is demonstrated that the specific mode of heat convection can majorly influence the intensity of entropy generation and that the irreversibilities are much larger under natural convection compared to those in mixed and forced convection. Calculation of Bejan number shows that this is due to more pronounced relative contribution of viscous irreversibilities when free convection effects dominate the mixed convection process.

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Section: Introductionmentioning

confidence: 99%

Mixed convection and thermodynamic irreversibilities in MHD nanofluid stagnation-point flows over a cylinder embedded in porous media

Alizadeh

Karimi

Arjmandzadeh

et al. 2018

J Therm Anal Calorim

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“…We apply the Successive linearization method to Equation (9) with their boundary conditions in Equation (12), by setting [19,25] …”

Section: Methodsmentioning

confidence: 99%

Entropy Generation on MHD Eyring–Powell Nanofluid through a Permeable Stretching Surface

Bhatti

Abbas

Rashidi

et al. 2016

Entropy

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130

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Abstract:In this article, entropy generation of an Eyring-Powell nanofluid through a permeable stretching surface has been investigated. The impact of magnetohydrodynamics (MHD) and nonlinear thermal radiation are also taken into account. The governing flow problem is modeled with the help of similarity transformation variables. The resulting nonlinear ordinary differential equations are solved numerically with the combination of the Successive linearization method and Chebyshev spectral collocation method. The impact of all the emerging parameters such as Hartmann number, Prandtl number, radiation parameter, Lewis number, thermophoresis parameter, Brownian motion parameter, Reynolds number, fluid parameter, and Brinkmann number are discussed with the help of graphs and tables. It is observed that the influence of the magnetic field opposes the flow. Moreover, entropy generation profile behaves as an increasing function of all the physical parameters.

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“…From a theoretical perspective, the second law of thermodynamics is utilized to study energy producing, converting and consuming systems. The volumetric rate of local entropy generation for a nanofluid, with thermal radiation and a magnetic field, can be expressed as (see [16,18,19]; (27) In Equation (27), the entropy generation is stated in four parts. The first part is entropy generation due to heat transfer irreversibility; the second part is the entropy generation due to the viscous dissipation irreversibility; the third part is the entropy generation due to the applied magnetic field irreversibility and the fourth part is due to the diffusive irreversibility.…”

Section: Entropy Generation Analysismentioning

confidence: 99%

“…The pioneer work in the analysis of entropy generation was done by Bejan [15]. Subsequently, entropy generation in MHD Casson nanofluid flow in the proximity of a stagnation point was investigated by Qing et al [16]. This study assumed the flow was subject to thermal radiation and a chemical reaction.…”

Section: Introductionmentioning

confidence: 99%

On Unsteady Three-Dimensional Axisymmetric MHD Nanofluid Flow with Entropy Generation and Thermo-Diffusion Effects

Almakki¹,

Dey²,

Mondal³

et al. 2017

Preprint

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Abstract:We investigate entropy generation in unsteady three-dimensional axisymmetric MHD nanofluid flow over a non-linearly stretching sheet. The flow is subject to thermal radiation and a chemical reaction. The conservation equations were solved using the spectral quasi-linearization method. The novelty of the work is in the study of entropy generation in three-dimensional axisymmetric MHD nanofluid and the choice of the spectral quasilinearization method as the solution method. The effects of Brownian motion and thermophoresis are also taken into account when the nanofluid particle volume fraction on the boundary in passively controlled. The results show that as the Hartman number increases, both the Nusselt number and the Sherwood number decrease whereas the skin friction increases. It is further shown that an increase in the thermal radiation parameter corresponds to a decrease in the Nusselt number. Moreover, entropy generation increases with the physical parameters.

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Entropy Generation on MHD Casson Nanofluid Flow over a Porous Stretching/Shrinking Surface

Cited by 190 publications

References 31 publications

Mixed convection and thermodynamic irreversibilities in MHD nanofluid stagnation-point flows over a cylinder embedded in porous media

Mixed convection and thermodynamic irreversibilities in MHD nanofluid stagnation-point flows over a cylinder embedded in porous media

Entropy Generation on MHD Eyring–Powell Nanofluid through a Permeable Stretching Surface

On Unsteady Three-Dimensional Axisymmetric MHD Nanofluid Flow with Entropy Generation and Thermo-Diffusion Effects

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