Time-dependent hydromagnetic free convection nanofluid flows within a wavy trapezoidal enclosure

Job, Victor M.; Gunakala, Sreedhara Rao; Kumar, B. Rushi; Sivaraj, R.

doi:10.1016/j.applthermaleng.2016.12.084

Cited by 36 publications

(17 citation statements)

References 16 publications

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“…Ali et al [10] applied the idea of Caputo-Fabrizio time fractional derivatives to magnetohydrodynamics free convection flow of generalized Walters'-B fluid over a static vertical plate. e unsteady MHD free convection flows of aluminawater and single-walled carbon nanotube-water nanofluids within a symmetrical wavy trapezoidal enclosure was reported by Job et al [11]. On the other hand, Sathish Kumar et al [12] investigated the effect of nonlinear thermal radiation on unsteady MHD flow between parallel plates.…”

Section: Introductionmentioning

confidence: 99%

Heat and Mass Transfer in Unsteady Boundary Layer Flow of Williamson Nanofluids

Kebede

Haile

Awgichew

et al. 2020

Journal of Applied Mathematics

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In this paper, analytic approximation to the heat and mass transfer characteristics of a two-dimensional time-dependent flow of Williamson nanofluids over a permeable stretching sheet embedded in a porous medium has been presented by considering the effects of magnetic field, thermal radiation, and chemical reaction. The governing partial differential equations along with the boundary conditions were reduced to dimensionless forms by using suitable similarity transformation. The resulting system of ordinary differential equations with the corresponding boundary conditions was solved via the homotopy analysis method. The results of the study show that velocity, temperature, and concentration boundary layer thicknesses generally decrease as we move away from the surface of the stretching sheet and the Williamson parameter was found to retard the velocity but it enhances the temperature and concentration profiles near the surface. It was also found that increasing magnetic field strength, thermal radiation, or rate of chemical reaction speeds up the mass transfer but slows down the heat transfer rates in the boundary layer. The results of this study were compared with some previously published works under some restrictions, and they are found in excellent agreement.

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Section: Introductionmentioning

confidence: 99%

Heat and Mass Transfer in Unsteady Boundary Layer Flow of Williamson Nanofluids

Kebede

Haile

Awgichew

et al. 2020

Journal of Applied Mathematics

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“…There are also some notable numerical investigations are worthwhile in the literature includes Job et al. [22], Arefmanesh et al. [23], Selimefendigil and Öztop [24] and Sheremet et al.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, Job et al. [22] and Al-Weheibi et al. [27] studied the effect of solid volume fraction in a trapezoidal shape enclosure filled with several water-based nanofluids.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of natural convective heat transport of copper oxide-water nanofluid flow inside a quadrilateral vessel

Uddin

Rasel

2019

Heliyon

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Nanofluid based heat transfer approaches have a tremendous prospect to develop novel cost-effective cooling technologies. In response to this potential development, a problem of unsteady copper oxide-water nanofluid flow and natural convective heat transfer within a quadrilateral vessel with uniform heating of bottom wall using modified Buongiorno model are investigated. The sloping wall of the vessel is maintained at constant low temperature and the uniform thermal condition on the bottom heated wall is considered, whereas the upper horizontal wall is regarded as adiabatic. The governing equations along with boundary conditions are solved using the Galerkin finite element method. Partial differential equation solver COMSOL Multiphysics with Matlab interface is used in the simulation. The results of the present problem of a certain situation as a special case have been verified by the previously published standard numerical investigations. The flow, thermal and concentration fields, local and average Nusselt number for various pertinent parameters entered into the problem have been analyzed. The time evolutions for a steady-state solution are also examined. The results show that the adjustment factor with the optimal nanoparticle volume fraction and the thermal Rayleigh number controls the optimal heat transfer. The trapezoidal vessel having higher sloping angles with the vertical axis exhibits higher heat transfer. Heat transfer decreases rapidly in 1–10 nm size nanoparticles for a nanofluid solution.

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“…water) and reported that agglomeration shear stress and sedimentation are the agents limiting the mixtures of nanoparticles and water. Using the same theory, Job et al (2016) described the motion of a time-dependent hydromagnetic-free convection nanofluid within a boundary layer formed on a wavy trapezoidal enclosure. Heat transfer coefficient of Alumina and SWCNT-water nanofluids are presented and discussed.…”

Section: Introductionmentioning

confidence: 99%

Gyrotactic microorganisms and thermoelectric effects on the dynamics of 29 nm CuO-water nanofluid over an upper horizontal surface of paraboloid of revolution

Sivaraj

Animasaun

Olabiyi

et al. 2018

MMMS

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Purpose The purpose of this paper is to provide an insight into the influence of gyrotactic microorganisms and Hall effect on the boundary layer flow of 29 nm CuO-water mixture on the upper pointed surface of a rocket, over the bonnet of a car and upper pointed surface of an aircraft. This is true since all these objects are examples of an object with variable thickness. Design/methodology/approach The simplification of Rosseland approximation (Taylor series expansion of T4 about T∞) is avoided; thus, two different parameters relating to the study of nonlinear thermal radiation are obtained. The governing equation is non-dimensionalized, parameterized and solved numerically. Findings Maximum vertical and horizontal velocities of the 29 nm CuO-water nanofluid flow is guaranteed at a small value of Peclet number and large value of buoyancy parameter depending on the temperature difference. When the magnitude of thickness parameter χ is small, cross-flow velocity decreases with the velocity index and the opposite effect is observed when the magnitude of χ is large. Originality/value Directly or indirectly, the importance of the fluid flow which contains 29 nm CuO nanoparticle, water, and gyrotactic microorganisms in the presence of Hall current has been pointed out as an open question in the literature due to its relevance in imaging, ophthalmological and translational medicine informatics.

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Time-dependent hydromagnetic free convection nanofluid flows within a wavy trapezoidal enclosure

Cited by 36 publications

References 16 publications

Heat and Mass Transfer in Unsteady Boundary Layer Flow of Williamson Nanofluids

Heat and Mass Transfer in Unsteady Boundary Layer Flow of Williamson Nanofluids

Numerical analysis of natural convective heat transport of copper oxide-water nanofluid flow inside a quadrilateral vessel

Gyrotactic microorganisms and thermoelectric effects on the dynamics of 29 nm CuO-water nanofluid over an upper horizontal surface of paraboloid of revolution

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