Natural convection and entropy production in hybrid nanofluid filled-annular elliptical cavity with internal heat generation or absorption

Tayebi, Tahar; Öztop, Hakan F.; Chamkha, Ali J.

doi:10.1016/j.tsep.2020.100605

Cited by 105 publications

(30 citation statements)

References 41 publications

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“…They witnessed an incredible increase in the heat transfer rate with the increase in the hybrid nanoparticle volume fraction. Tayebi et al 28 examined the fluid flow and entropy analysis of a hybrid nanoliquid in an annular cavity delimited by two elliptical and isothermal cylinders, considering the effects of heat generation/absorption. They noted that the maximum flow intensity occurs at the maximum internal heat generation value in the case of the conduction‐dominated regime, whereas the maximum flow intensity occurs in the presence of the maximum internal heat absorption value for the case of the convection dominated regime.…”

Section: Introductionmentioning

confidence: 99%

Entropy analysis of magnetohydrodynamic nanofluid transport past an inverted cone: Buongiorno's model

Vedavathi

Dharmaiah

Gaffar³

et al. 2020

Heat Trans

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The entropy analysis of the magnetohydrodynamic (MHD) thermal convection flow of a nanofluid past an inverted cone with suction/injection is presented in this article. The Buongiorno's model is adopted for nanofluid transport, considering the Brownian motion and thermophoresis effects. The governing partial differential conservation equations and wall and freestream boundary conditions are rendered into a nondimensional form and solved computationally using the Keller‐Box finite‐difference method. The entropy analysis due to MHD fluid flow and viscous dissipation is also included. The numerical results are presented graphically for the impact of various thermophysical parameters on velocity, temperature, nanoparticle volume fraction, shear stress rate, heat transfer rate, and mass transfer. Validations with earlier solutions in the literature are also included. A comprehensive description of the simulations is included. It is observed that velocity and temperature are enhanced with the increase in Brownian motion parameter values, whereas concentration, entropy, and Bejan number are reduced. An increase in the thermophoresis parameter and buoyancy ratio parameter reduces velocity and entropy, but increases temperature, concentration, and Bejan number. An increase in the magnetic parameter is found to decrease velocity, entropy generation number, and Bejan number, but it increases temperature and concentration. Also, an increase in the suction/injection parameter is seen to reduce velocity, temperature, concentration, and Bejan number, but the entropy generation number is observed to increase. The study finds applications in heat exchangers technology, materials processing, solar energy systems, cooling and heating processes, environmental applications, geothermal energy storage, and so on.

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Section: Introductionmentioning

confidence: 99%

Entropy analysis of magnetohydrodynamic nanofluid transport past an inverted cone: Buongiorno's model

Vedavathi

Dharmaiah

Gaffar³

et al. 2020

Heat Trans

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“…The rate of heat transfer in the enclosure is measured using local and averaged Nusselt number. The rate of heat transfer at a local position relative to the wall is denoted as Nu loc , where [9][10][11][12], (19) The averaged rate of heat transfer, ̅̅̅̅ along the hot wall BC is, ̅̅̅̅ ∫ (20)…”

Section: Mathematical Formulationsmentioning

confidence: 99%

“…The advantage of the positive enhancement in both nanoparticles can be taken without loses the other. For example, Cu-Al Investigation of natural convection of hybrid nanofluid is extensively studied by Hayat and Nadeem [8], Tayebi and Oztop [9], Tayebi et al [10], Al-Srayyih et al [11] and Tayebi and Chamkha [12].…”

Section: Introductionmentioning

confidence: 99%

“…1: Schematic diagram of: (a) the enclosure; (b) a triangular meshing of the enclosurehas a relatively high thermal conductivity, low reactivity and can be procured at a lower cost. Investigation of natural convection of hybrid nanofluid is extensively studied by Hayat and Nadeem[8], Tayebi and Oztop[9], Tayebi et al[10], Al-Srayyih et al[11] and Tayebi and Chamkha[12].Based on the literature review, there is a very little investigation done on the natural convection inside a U-shaped enclosure with a single heating source (bottom wall) with varying nanoparticle shape. Most of the study focused on three heating sources located on the left, bottom and right wall.…”

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confidence: 99%

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Nanoparticle shape effect on the natural-convection heat transfer of hybrid nanofluid inside a U-shaped enclosure

et al. 2022

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The effect of nanoparticle shape on the natural convection heat transfer of Cu-Al2O3/water hybrid nanofluid inside a U-shaped enclosure is presented in this paper. The governing equations are transformed into the dimensionless form using dimensionless variables. A three-node triangular finite element method is used with the Newton-Raphson method to solve the problem numerically. The streamlines and isotherms as well as the local and average Nusselt numbers are presented for the fluid flow with Rayleigh number of 104 to 106.It is found that blade nanoparticle shape produces the highest heat transfer rate while sphere is the lowest.

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“…For a fixed Rayleigh number, entropy rate enhanced with enlarged Darcy number. Influence of natural convection in elliptical cavity pervaded by hybrid nanofluid was inspected by Tayebi et al [29]. Zahid et al [30] explained that low entropy production occurs for higher Hall parameter.…”

Section: Introductionmentioning

confidence: 99%

Influence of Heat Generation/Absorption and Stagnation point on Polystyrene -TiO2/H 2 O Hybrid Nanofluid

Masood

Farooq

2021

Preprint

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This article focuses on hybrid nanofluid flow induced by stretched surface. The present context covers stagnation point flow of a hybrid nanofluid with the effect of heat gen-eration/absorption. Currently most famous class of nanofluids is Hybrid nanofluid. It contains polystyrene and titanium oxide as a nanoparticles and water as a base fluid. First time attributes of heat transfer are evaluated by utilizing polystyrene-TiO 2 / H 2 O hybrid nanofluid with heat gen-eration/absorption. Partial differential equations are converted into ordinary differential equation by using appropriate transformations for heat and velocity. Homotopy analysis method is operated for solution of ordinary differential equations. Flow and heat are disclosed graphically for unlike parameters. Resistive force and heat transfer rate is deliberated mathematically and graphically. It is deduced that velocity field enhanced for velocity ratio parameter whereas temperature field decays for heat generation/absorption coefficient. To judge the production of any engineering system entropy generation is also calculated. It is noticed that entropy generation grows for Prandtl number and Eckert number while it shows opposite behaviour for temperature difference parameter.

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Natural convection and entropy production in hybrid nanofluid filled-annular elliptical cavity with internal heat generation or absorption

Cited by 105 publications

References 41 publications

Entropy analysis of magnetohydrodynamic nanofluid transport past an inverted cone: Buongiorno's model

Entropy analysis of magnetohydrodynamic nanofluid transport past an inverted cone: Buongiorno's model

Nanoparticle shape effect on the natural-convection heat transfer of hybrid nanofluid inside a U-shaped enclosure

Influence of Heat Generation/Absorption and Stagnation point on Polystyrene -TiO2/H 2 O Hybrid Nanofluid

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