Variable Viscosity Effects on Time Dependent Magnetic Nanofluid Flow past a Stretchable Rotating Plate

Ram, P. C.; Joshi, Vimal Kumar; Sharma, Kushal; Walia, Mittu; Yadav, Nisha

doi:10.1515/phys-2016-0072

Cited by 33 publications

(15 citation statements)

References 24 publications

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“…A fourth order Runge-Kutta method is employed to obtain the numerical solution followed by shooting technique with a systematic guessing of missing boundary conditions U′(0),V′(0), and θ′(0) as employed by Ram et al [36].…”

Section: Modelling and Solution Of The Problemmentioning

confidence: 99%

Numerical investigation of magnetic nanofluids flow over rotating disk embedded in a porous medium

Joshi¹,

Ram²,

Tripathi³

et al. 2018

THERM SCI

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Combined effects of thermal radiation and variable viscosity on a time-dependent boundary-layer flow of magnetic nanofluids over a rotating disk in the presence of the porous medium have been numerically investigated. To carry out the study, hydrocarbon based magnetic nanofluid containing magnetite Fe 3 O 4 particles of 10 nm with magnetic phase concentration of 10% has been taken. For numerical solutions of the modelled system containing the governing equation of the flow, a MATLAB tool ODE45 is employed with shooting technique for the initial guess of the unknown boundary conditions. The flow phenomenon and heat transfer on the plate surface are characterised by various flow parameters such as viscosity variations, unsteady rotation parameter, Prandtl number, and radiation parameter. Also, a comparative thermal analysis has been carried out for magnetic nanofluids having three different bases viz. hydrocarbon, fluorocarbon, and water. Results reveal that heat transfer rate of hydrocarbon base magnetic nanofluids is 73.4511% faster than water base magnetic nanofluids, and 239.7458% faster than fluorocarbon base magnetic nanofluids. This enhanced heat transfer capacity of hydrocarbon base magnetic nanofluids will help in improving the performance of oil and ore extraction drilling systems used in mining industry and other geothermal applications.

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Section: Modelling and Solution Of The Problemmentioning

confidence: 99%

Numerical investigation of magnetic nanofluids flow over rotating disk embedded in a porous medium

Joshi¹,

Ram²,

Tripathi³

et al. 2018

THERM SCI

Self Cite

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“…The results indicated that increasing viscosity variation decreases the radial and axial velocity. Further, Ram et al . (2016) studied variable viscosity effects on time-dependent magnetic nanofluid flow past a stretchable rotating plate.…”

Section: Introductionmentioning

confidence: 96%

MHD natural convection in a square porous cavity filled with a water-based magnetic fluid in the presence of geothermal viscosity

Sheremet

Astanina

Pop

2018

HFF

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Purpose The purpose of this paper is a numerical analysis of natural convection in a square porous cavity filled with a water-based magnetic fluid of geothermal viscosity under the effect of inclined uniform magnetic field. Design/methodology/approach The domain of interest includes the square porous cavity filled with a water-based magnetic fluid (W40). Horizontal walls are supposed to be adiabatic, while right vertical wall is kept at constant low temperature and left vertical wall is kept at constant high temperature. An inclined uniform magnetic field affects the fluid flow and heat transfer inside the cavity. The viscosity of the working fluid is proportional to the linearly decreasing function of depth (vertical coordinate) and inversely proportional to the linear function of temperature. It is assumed in the analysis that the flow is laminar. The fluid is Newtonian and the Boussinesq approximation is valid. The governing equations have been discretized using the finite difference method with the uniform grid. Simulations have been carried out for different values of the Rayleigh number, Hartmann number, Darcy number, magnetic field inclination angle and viscosity variation parameters. Findings It has been revealed that an increase in the viscosity parameters leads to the heat transfer enhancement and convective flow intensification. At the same time, this intensification is more essential for high values of the Rayleigh number. Originality/value The originality of this work is to analyze MHD natural convection in a square porous cavity filled with a water-based magnetic fluid of geothermal viscosity. The results would benefit scientists and engineers to become familiar with the analysis of convective heat and mass transfer in nanofluids, and the way to predict the properties of nanofluid convective flow in advanced technical systems, in industrial sectors including transportation, power generation, chemical sectors and electronics.

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“…Their outcomes show that solid volume friction decreases the velocity of nanoparticles close to the wall of the channels and escalates the thickness of the thermal boundary layer of the channels. The study of magnetohydrodynamic flow of nanofluids over a rotating stretchable plate in the presence of a magnetic field was captured by Ram et al [8].…”

Section: Introductionmentioning

confidence: 99%

Implications of Multiple Numerical Aspects for Carreau Nanofluids With Heat Generation/absorption via Nonuniform Channels

Hashim

Rehman

2022

Preprint

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Nanomaterials are unique work fluids with preeminent thermal performance for improving heat dissipation. We present theoretical and mathematical insights into nanofluid heat transfer and flow dynamics in nonuniform channels utilizing a non-Newtonian fluid. Therefore, the impacts of heat absorption/generation and Joule heating in a magneto hydrodynamic flow of a Carreau nanofluid into a convergent channel with viscous dissipation are addressed in this mathematical approach. Brownian and thermophoresis diffusion are considered to investigate the behavior of temperature and concentration. The magnetic effects on the flow performance are measured. The leading nonlinear equations are solved numerically using the BVP4c solver and RK-4 (Runge–Kutta) along with the shooting algorithm using the computer software MATLAB. The obtained dual solutions are presented graphically. The consequences of the variable magnetic field, heat absorption/generation and numerous physical parameters on the temperature and concentration field are surveyed. The outcomes show that increasing the rates of the heat absorption/generation parameter and Eckert number enhances the thickness of the thermal profile of the convergent channels, while increasing the value of the Prandtl number expands the thickness of the momentum boundary layer of the convergent channels. The key findings related to the study models are presented and discussed. An assessment of solutions achieved in this article is made with existing data in the literature.

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Variable Viscosity Effects on Time Dependent Magnetic Nanofluid Flow past a Stretchable Rotating Plate

Cited by 33 publications

References 24 publications

Numerical investigation of magnetic nanofluids flow over rotating disk embedded in a porous medium

Numerical investigation of magnetic nanofluids flow over rotating disk embedded in a porous medium

MHD natural convection in a square porous cavity filled with a water-based magnetic fluid in the presence of geothermal viscosity

Implications of Multiple Numerical Aspects for Carreau Nanofluids With Heat Generation/absorption via Nonuniform Channels

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