Stagnation Point Flow of Nanofluids Towards Stretching Sheet Through a Porous Medium with Heat Generation

Abdollahzadeh, M.; Sedighi, Ali Asghar; Esmailpour, Mahboube

doi:10.1166/jon.2018.1431

Cited by 14 publications

(3 citation statements)

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“…This means the fluid temperature can be controlled by controlling the effective Prandtl number, in other words, the temperature can be well controlled by the thermal radiation parameter in this case. Abdollahzadeh et al [13] studied regarding stagnation-point flow of nanofluids towards a stretching sheet through a porous medium with heat generation. It was found that increasing the nanofluid concentration increases the heat transfer rate and the skin friction coefficient at the surface when the velocity ratio parameter is larger than unity (C > 1).…”

Section: Introductionmentioning

confidence: 99%

Stagnation-point flow and heat transfer over an exponentially shrinking/stretching sheet in porous medium with heat generation

Hakim,

Rosali,

Johari

2023

Math. Model. Comput.

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This study seeks to examine the fluid flow at the stagnation point over an exponentially shrinking and stretching sheet in a porous medium. This study also investigates the heat transfer rate in the presence of heat generation. By using the appropriate similarity transformation, we obtained ordinary differential equations (ODEs) that are reduced from the governing system of partial differential equations (PDEs). These resulting equations are subjected to new boundary conditions and solved numerically by using BVP4C in MATLAB software. The effects of the parameters involved in this study are summarized and thoroughly discussed: the skin friction coefficient, local Nusselt number, velocity profile, and temperature profile obtained. The analysis is done by using graphical and tabular data. The observed parameters are the permeability parameter K and the heat generation parameter Q towards shrinking/stretching parameter λ. It is found that a dual solution exists for λ<0 (shrinking case), whereas the solution is unique for λ>0 (stretching case). The analysis reveals that with heat generation being increased, the skin friction coefficient is constant. However, it increases when permeability increases. The local Nusselt number decreases with heat generation being increased. However, it increases when the permeability increases.

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Section: Introductionmentioning

confidence: 99%

Stagnation-point flow and heat transfer over an exponentially shrinking/stretching sheet in porous medium with heat generation

Hakim,

Rosali,

Johari

2023

Math. Model. Comput.

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“…Ghalambaz et al [8] utilized the Finite-difference with collocation strategy to explore the mixed convective flow as well as heat transmission of an Al 2 O 3 -Cu/water hybrid nanofluid across a vertical surface. Abdollahzadeh et al [9] explored the continuous two-dimensional stagnant point movement of three varieties of nanofluids, specifically Cu-water, Al 2 O 3 -water and TiO 2 -water, against a porous stretched surface utilizing a heat generation, shooting methodology and the fourth-order Runge-Kutta approach. Jafarimoghaddam [10] researched the stagnation-point movement against a porous linearly extending/shrinking wall embedded in copper/water nanofluids employing the Runge-Kutta-Fehlberg Algorithm (RKF45).…”

Section: Introductionmentioning

confidence: 99%

An Analysis for Variable Physical Properties Involved in the Nano-Biofilm Transportation of Sutterby Fluid across Shrinking/Stretching Surface

et al. 2022

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In this article, we explore how activation energy and varied transit parameters influence the two-dimensional stagnation point motion of nano-biofilm of Sutterby fluids incorporating gyrotactic microbes across a porous straining/shrinking sheet. Prior investigations implied that fluid viscosity as well as thermal conductance are temperature based. This research proposes that fluid viscosity, heat capacity and nanofluid attributes are all modified by solute concentration. According to some empirical research, the viscosity as well as heat conductivity of nanoparticles are highly based on the concentration of nanoparticles instead of only the temperature. The shooting approach with the RK-4 technique is applied to acquire analytical results. We contrast our outcomes with those in the existing research and examine their consistency and reliability. The graphic performance of relevant factors on heat, velocity, density and motile concentration domains are depicted and discussed. The skin friction factor, Nusselt number, Sherwood number and the motile density are determined. As the concentration-dependent properties are updated, the speed, temperature, concentration and motile density profiles are enhanced, but for all concentration-varying factors, other physical quantities deteriorate.

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“…The specification of solar collector. The specification of water and nanoparticles(Abdollahzadeh et al, 2018;Nguyen et al, 2020).…”

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confidence: 99%

The Influence of Combined Turbulators on the Hydraulic-Thermal Performance and Exergy Efficiency of MWCNT-Cu/Water Nanofluid in a Parabolic Solar Collector: A Numerical Approach

2021

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The present research benefits from the finite volume method in investigating the influence of combined turbulators on the thermal and hydraulic exergy of a parabolic solar collector with two-phase hybrid MWCNT-Cu/water nanofluid. All parabolic geometries are produced using DesignModeler software. Furthermore, FLUENT software, equipped with a SIMPLER algorithm, is applied for analyzing the performance of thermal and hydraulic, and exergy efficiency. The Eulerian–Eulerian multiphase model and k-ε were opted for simulating the two-phase hybrid MWCNT-Cu/water nanofluid and turbulence model in the collector. The research was analyzed in torsion ratios from 1 to 4, Re numbers from 6,000 to 18,000 (turbulent flow), and the nanofluid volume fraction of 3%. The numerical outcomes confirm that the heat transfer and lowest pressure drop are relevant to the Re number of 18,000, nanofluid volume fraction of 3%, and torsion ratio of 4. Furthermore, in all torsion ratios, rising Re numbers and volume fraction lead to more exergy efficiency. The maximum value of 26.32% in the exergy efficiency was obtained at a volume fraction of 3% and a torsion ratio of 3, as the Re number goes from 60,000 to 18,000.

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Stagnation Point Flow of Nanofluids Towards Stretching Sheet Through a Porous Medium with Heat Generation

Cited by 14 publications

References 0 publications

Stagnation-point flow and heat transfer over an exponentially shrinking/stretching sheet in porous medium with heat generation

Stagnation-point flow and heat transfer over an exponentially shrinking/stretching sheet in porous medium with heat generation

An Analysis for Variable Physical Properties Involved in the Nano-Biofilm Transportation of Sutterby Fluid across Shrinking/Stretching Surface

The Influence of Combined Turbulators on the Hydraulic-Thermal Performance and Exergy Efficiency of MWCNT-Cu/Water Nanofluid in a Parabolic Solar Collector: A Numerical Approach

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