Numerical Study on Binary Nanofluid Convection in a Rotating Porous Layer

Sharma, Jyoti; Gupta, Urvashi; Wanchoo, R. K.

doi:10.1007/s12591-015-0268-4

Cited by 15 publications

(6 citation statements)

References 10 publications

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“…The stabilizing effect of Taylor number for stationary as well as oscillatory mode of convection is shown in Fig. 5 and mode of convection is found to be oscillatory [80]. Further, the onset of thermosolutal convection in a rotating porous nanofluid layer was investigated in many works [81,82] using Darcy and Darcy Brinkman model.…”

Section: Effect Of Rotationmentioning

confidence: 98%

Rayleigh–Bénard instability in nanofluids: a comprehensive review

Ahuja¹,

Sharma

2020

Micro and Nano Syst Lett

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The extraordinary enhancement in heat transfer efficiency of nanofluids at extremely low volume fractions has attracted a lot of attention in identifying the governing mechanisms. The nanoscale effects, Brownian motion (random motion of particles inside the base fluid) and thermophoresis (diffusion of particles due to temperature gradient) are found to be important slip mechanisms in nanofluids. Based on these findings, a set of partial differential equations for conservation laws for nanofluids was formed. Since then, a large number of mathematical studies on convective heat transfer in nanofluids became feasible. The present paper summarizes the studies pertaining to instability of a horizontal nanofluid layer under the impact of various parameters such as rotation, magnetic field, Hall currents and LTNE effects in both porous and non-porous medium. Initially, investigations were made using the model considering fixed initial and boundary conditions on the layer, gradually the model was revised in the light of more practical boundary conditions and recently it has been modified to get new and more interesting results. The exhaustive analysis of instability problems is presented in the paper and prospects for future research are also identified.

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Section: Effect Of Rotationmentioning

confidence: 98%

Rayleigh–Bénard instability in nanofluids: a comprehensive review

Ahuja¹,

Sharma

2020

Micro and Nano Syst Lett

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“…The buoyancy forces are strong owing to the high rotational velocity and the thermal gradient. The influence of rotation on the onset of convection in binary nanofluids saturated with porous media, incorporating the effects of Brownian diffusion and thermophoresis, was investigated by Yadav et al [29], Agarwal and Rana [30], Sharma et al [31], and Rana et al [32]. It has been reported that the rotation parameter controls the stability of nanofluid-saturated porous layers.…”

Section: Introductionmentioning

confidence: 99%

Effects of thermodiffusion on Darcy–Brinkman convection in a rotating binary nanofluid saturating a porous layer

Gaikwad

Surwase

2022

Can. J. Phys.

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In this study, the onset of convection in a rotating horizontal porous layer saturated by a binary nanofluid was theoretically investigated under the influence of thermodiffusion and nanoparticles. To study the onset of convection, the Darcy–Brinkman model was employed for the porous medium, and the thermal Rayleigh number was derived analytically using linear stability analysis. Water–ammonia-based silver, copper, and alumina, three binary nanofluids, were considered, and the effect of nanoparticles on the stability of the system was analysed using addition factor analysis. The Brinkman model for viscosity and Bruggeman model under the mean field approach for thermal conductivity were used to study the impact of nanoparticles. Heat transport was examined by calculating the heat transfer coefficient. The effects of nondimensional parameters involved in binary nanofluids on the onset of convective instabilities are depicted pictorially. The dependence of the size of the convection cells on nondimensional parameters is also discussed. The Darcy–Taylor number decreases the size of convection cells, whereas the Darcy number increases the size of convection cells. The size of the convection cells is independent of the porosity of the medium, Lewis number, volume fraction of nanoparticles, Soret effect of nanoparticles, and the solute in binary nanofluids. Furthermore, the Darcy–Taylor number and porosity have stabilising effects, whereas the Darcy number, volume fraction of nanoparticles, and Lewis number have destabilising effects on the system. Soret effects of nanoparticles and solutes exhibit dual consequences on stability. They stabilise the binary nanofluid layer if δ4 < –1 and destabilise when δ4 > –1. Their effect is immaterial if δ4 = –1.

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“…Sharma and Gupta [43] studied the onset of doublediffusive convection in a rotating binary nanofluid layer saturated by a porous medium using Darcy-Brinkman model. Later, Sharma et al, [44] investigated the convection in a rotating binary nanofluid layer in porous medium using Darcy-Brinkman model.…”

Section: Introductionmentioning

confidence: 99%

Rayleigh-Benard Convection in Nanofluids Layer saturated in a Rotating Anisotropic Porous Medium with Feedback Control and Internal Heat Source

Khalid

Mokhtar

İbrahim

2021

CFDL

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Control strategy on Rayleigh-Benard convection in rotating nanofluids saturated in anisotropic porous layer heated from below is studied in the presence of uniformly internal heat source for rigid-rigid, free-free, and lower-rigid and upper-free boundaries. Feedback control strategy with an array of sensors situated at the top plate and actuators located at the bottom plate of the nanofluids layer are considered in this study. Linear stability analysis based on normal mode technique has been performed, the eigenvalue problem is obtained numerically by implementing the Galerkin method and computed by using Maple software. Model employed for the nanofluids includes the mechanisms of Brownian motion and thermophoresis. The problem of the onset of convective rolls instabilities in a horizontal porous layer with isothermal boundaries at unequal temperatures known as Horton-Roger-Lapwood model based on the Darcy model for the fluids flow is used. The influences of internal heat source’s strength, modified diffusivity ratio, nanoparticles concentration Darcy-Rayleigh number and nanofluids Lewis number are found to advance the onset of convection, meanwhile the mechanical anisotropy parameter, thermal anisotropy parameter, porosity, rotation, and controller effects are to slow down the process of convective instability. No visible observation on the modified particle density increment and rigid-rigid boundaries are the most stable system compared to free-free and rigid-free boundaries.

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Numerical Study on Binary Nanofluid Convection in a Rotating Porous Layer

Cited by 15 publications

References 10 publications

Rayleigh–Bénard instability in nanofluids: a comprehensive review

Rayleigh–Bénard instability in nanofluids: a comprehensive review

Effects of thermodiffusion on Darcy–Brinkman convection in a rotating binary nanofluid saturating a porous layer

Rayleigh-Benard Convection in Nanofluids Layer saturated in a Rotating Anisotropic Porous Medium with Feedback Control and Internal Heat Source

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