Unsteady MHD free convection nanofluid flows within a wavy trapezoidal enclosure with viscous and Joule dissipation effects

Job, Victor M.; Gunakala, Sreedhara Rao

doi:10.1080/10407782.2015.1080946

Cited by 43 publications

(21 citation statements)

References 17 publications

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“…It may be recorded that for the non-porous medium, i.e., , model equations (2)-(5) together with initial and boundary conditions equations (6)-(9) are the same as those obtained by Job and Gunakala (2016). Following Minkowycz et al (2013), thermophysical properties of nanofluids that are presented in governing equations are given as follows:…”

Section: Journal Of the National Science Foundation Of Sri Lanka 48(1)mentioning

confidence: 98%

“…It is observed that the rate of heat transfer is higher for wavy surfaces as compared to smooth surfaces. Recently, Job and Gunakala (2016) used the finite element method to analyse the unsteady buoyancy-driven nanofluid flows inside an enclosure, which is trapezoid with the wavy bottom wall. It was observed that the rise in amplitude of the wavy wall results in a reduction of the strength of the flow circulation and increment in temperature.…”

Section: March 2020mentioning

confidence: 99%

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MHD natural convection nanofluid flows in a wavy trapezoidal porous enclosure with differentially heated side walls

Reddy

Panda

2020

J. Natn. Sci. Foundation Sri Lanka

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Flow analysis of the Al 2 O 3-water nanofluid in a porous trapezoidal enclosure is deliberated in this research work. The enclosure is bounded by four differentially heated walls with the bottom wall considered as wavy. The viscous and Joule dissipation effects are taken into account. The governing equations of the flow are non-dimensionalised, and the Galerkin finite element method is employed to solve the resulting unsteady initial and boundary value problem using Taylor-Hood elements to avoid instabilities. The numerical scheme is validated with available literature for a simplified case of a problem, and the results are found to be in good agreement. The influence of Darcy number and nanoparticle volume fraction on the dimensionless streamlines and isotherms are plotted and illustrated in detail. The rate of heat transfers near the bottom wall in a porous medium is analysed through simulated data. It is found that the heat transfer rate increases in the presence of a porous domain. Further, a sensitivity analysis has been performed using Response Surface Methodology (RSM) to identify the pertinent parameters of the problem such as Hartmann number, Darcy number, and nanoparticles whose variation have an important influence on the average Nusselt number. The analysis reveals that the Darcy number, Hartmann number and the nanoparticle volume fraction are related to the average Nusselt number. Thus, the finding suggests that the porous medium has a significant role in enhancing the heat transfer in a flow of MHD nanofluid within a wavy trapezoidal enclosure.

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Section: Journal Of the National Science Foundation Of Sri Lanka 48(1)mentioning

confidence: 98%

Section: March 2020mentioning

confidence: 99%

MHD natural convection nanofluid flows in a wavy trapezoidal porous enclosure with differentially heated side walls

Reddy

Panda

2020

J. Natn. Sci. Foundation Sri Lanka

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“…T ¼ 0 on the inclined fin Vorticity: Table 1 Thermophysical properties of water and CNT nanoparticles [40].…”

Section: Boundary Conditionsmentioning

confidence: 99%

Control of natural convection via inclined plate of CNT-water nanofluid in an open sided cubical enclosure under magnetic field

Kolsi

Al‐Rashed

Al‐Salem

et al. 2017

International Journal of Heat and Mass Transfer

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“…Kasaeipoor et al [18] analyzed the effects of magnetic field on mixed convection flow of Cu-water nanofluid in a T-shaped cavity and suggested that augmentation of heat transfer rate with increasing volume fraction depends on a certain range of Reynolds number and Hartmann number. Job and Gunakala [19] investigated numerically the effect of viscous and joule dissipation on two-dimensional unsteady buoyancy-driven flow of alumina-water and SWCNT-water nanofluids in a wavy trapezoidal cavity in the presence of magnetic field. They reported that the flow circulation reduces and heat transfer rate increases for higher amplitude of the wavy bottom wall and opposite trend is also observed with an increase in time.…”

Section: Introductionmentioning

confidence: 99%

MHD natural convection and entropy generation in a grooved enclosure filled with nanofluid using two-component non-homogeneous model

2020

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In this paper, a computational study of natural convection in a grooved enclosure filled with water-based nanofluid in the presence of external magnetic field is numerically investigated. Two-component non-homogeneous model is introduced to develop the governing partial differential equations. Galerkin finite element method is used to solve the governing equations. The computation is carried out for a wide range of governing parameters such as Rayleigh number (10 3 ≤ Ra ≤ 10 6), magnetic field parameter (10 ≤ Ha ≤ 100) and volume fraction of nanoparticles (0% ≤ ϕ ≤ 5%) with fixed values of remaining parameters. A detailed parametric analysis is performed to show the effects of physical parameters on the fluid flow and temperature distributions within the enclosure via streamlines, isotherms, isoconcentrations, midsectional velocities, average Nusselt number and temperature, respectively. In addition, the entropy generation and Bejan number are also computed and discussed elaborately. The results of the current study are compared to those of previous numerical and experimental studies and found to be in rational agreements. The results ascertain that the average Nusselt number and entropy generation increase with rising Rayleigh number and nanoparticle volume fraction, whereas they decrease with increasing magnetic field strength. Moreover, it is found that the appropriate combination of governing parameters can maximize the heat transfer rate and minimize the entropy generation as well.

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Unsteady MHD free convection nanofluid flows within a wavy trapezoidal enclosure with viscous and Joule dissipation effects

Cited by 43 publications

References 17 publications

MHD natural convection nanofluid flows in a wavy trapezoidal porous enclosure with differentially heated side walls

MHD natural convection nanofluid flows in a wavy trapezoidal porous enclosure with differentially heated side walls

Control of natural convection via inclined plate of CNT-water nanofluid in an open sided cubical enclosure under magnetic field

MHD natural convection and entropy generation in a grooved enclosure filled with nanofluid using two-component non-homogeneous model

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