Entropy Analysis in Mixed Convection MHD flow of Nanofluid over a Non-linear Stretching Sheet

Matin, Meisam Habibi; Nobari, M.R.H.; Jahangiri, Pouyan

doi:10.1299/jtst.7.104

Cited by 32 publications

(17 citation statements)

References 20 publications

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“…They observed that the Lorentz force generates vortices near the magnetic sources and the number and strength of vortices depend strongly on Hartmann number. Martin et al [23] analyzed the impact of frictional heating on entropy generation in a MHD mixed convection flow of a nanofluid over a non-linear stretching sheet. They observed http://www.ispacs.com/journals/cna/2017/cna-00319/ International Scientific Publications and Consulting Services that the surface serves as a strong source of irreversibility due to higher entropy generation number near the surface.…”

Section: Introductionmentioning

confidence: 99%

A study on entropy generation on thin film flow over an unsteady stretching sheet under the influence of magnetic field, thermocapillarity, thermal radiation and internal heat generation/absorption

Sarojamma¹,

Vajravelu²,

Sreelakshmi³

2017

Communications in Numerical Analysis

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Entropy generation is inherently affiliated with transport of thermal energy. However, not much attention has been paid to the study of entropy generation in liquid thin film flows. Hence, in this paper an analysis is carried out to study the entropy generation in a thin viscous fluid film on a stretching sheet embedded in a porous medium subject to a magnetic field and thermocapillarity force taking thermal radiation and internal heating/absorption into account. The numerical solution of the equations of momentum and energy governing the flow is obtained. Influence of various parameters emerged in the analysis on the velocity, temperature, surface drag, Nusselt number, entropy generation number and the Bejan number are graphically illustrated and discussed. Thermocapillarity number shows an enhancement of velocity at the free surface. Film thickness is found to increase with increasing thermocapillary force. Thinner films are noticed for stronger magnetic field strengths. It is found that in the absence of thermocapillary force, the effect of magnetic field on entropy generation number near the stretching surface is prominent. Thermocapillarity is seen to have a stronger effect on the entropy generation number near the stretching surface as well as at the free surface.

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Section: Introductionmentioning

confidence: 99%

A study on entropy generation on thin film flow over an unsteady stretching sheet under the influence of magnetic field, thermocapillarity, thermal radiation and internal heat generation/absorption

Sarojamma¹,

Vajravelu²,

Sreelakshmi³

2017

Communications in Numerical Analysis

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“…Thermosolutal convection in Walters' (Model B') elastico-viscous rotating fluid permeated with suspended particles and variable gravity field in porous medium in hydromagnetics was investigated by Rana [10]. Matin et al [11] presented the MHD mixed convective flow of a nanofluid over a stretching sheet. Chand and and Rana [12] examined the oscillating convection of nanofluid in porous medium.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Flow of an Oldroyd-B Nanofluid towards Stretching Surface with Heat Generation/Absorption

Khan

Malik

2014

PLoS ONE

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This article addresses the steady three-dimensional flow of an Oldroyd-B nanofluid over a bidirectional stretching surface with heat generation/absorption effects. Suitable similarity transformations are employed to reduce the governing partial differential equations into coupled nonlinear ordinary differential equations. These nonlinear ordinary differential equations are then solved analytically by using the homotpy analysis method (HAM). Graphically results are presented and discussed for various parameters, namely, Deborah numbers and , heat generation/absorption parameter Prandtl parameter , Brownian motion parameters, thermophoresis parameter and Lewis number . We have seen that the increasing values of the Brownian motion parameter and thermophoresis parameter leads to an increase in the temperature field and thermal boundary layer thickness while the opposite behavior is observed for concentration field and concentration boundary layer thickness. To see the validity of the present work, the numerical results are compared with the analytical solutions obtained by Homotopy analysis method and noted an excellent agreement for the limiting cases.

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“…exchangers. Matin et al [44] accomplished a numerical research on MHD mixed convection flow using SiO2-water nanofluids over a non-linear stretching sheet. Selimefendigil et al [45] carried out an investigation on entropy generation of nanofluids natural convection in entrapped trapezoidal cavities taking the influence of magnetic field into consideration.…”

Section: Physical Model and Numerical Methodsmentioning

confidence: 99%

Entropy Generation and Heat Transfer Performances of Al2O3-Water Nanofluid Transitional Flow in Rectangular Channels with Dimples and Protrusions

Xie

Zheng

Zhang

et al. 2016

Entropy

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Nanofluid has great potentials in heat transfer enhancement and entropy generation decrease as an effective cooling medium. Effects of Al 2 O 3 -water nanofluid flow on entropy generation and heat transfer performance in a rectangular conventional channel are numerically investigated in this study. Four different volume fractions are considered and the boundary condition with a constant heat flux is adopted. The flow Reynolds number covers laminar flow, transitional flow and turbulent flow. The influences of the flow regime and nanofluid volume fraction are examined. Furthermore, dimples and protrusions are employed, and the impacts on heat transfer characteristic and entropy generation are acquired. It is found that the average heat transfer entropy generation rate descends and the average friction entropy generation rate rises with an increasing nanofluid volume fraction. The effect of nanofluid on average heat transfer entropy generation rate declines when Reynolds number ascends, which is inverse for average friction entropy generation rate. The average wall temperature and temperature uniformity both drop accompanied with increasing pumping power with the growth in nanofluid volume fraction. The employment of dimples and protrusions significantly decreases the average entropy generation rate and improve the heat transfer performance. The effect of dimple-case shows great difference with that of protrusion-case.

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Entropy Analysis in Mixed Convection MHD flow of Nanofluid over a Non-linear Stretching Sheet

Cited by 32 publications

References 20 publications

A study on entropy generation on thin film flow over an unsteady stretching sheet under the influence of magnetic field, thermocapillarity, thermal radiation and internal heat generation/absorption

A study on entropy generation on thin film flow over an unsteady stretching sheet under the influence of magnetic field, thermocapillarity, thermal radiation and internal heat generation/absorption

Three-Dimensional Flow of an Oldroyd-B Nanofluid towards Stretching Surface with Heat Generation/Absorption

Entropy Generation and Heat Transfer Performances of Al2O3-Water Nanofluid Transitional Flow in Rectangular Channels with Dimples and Protrusions

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