Lattice Boltzmann simulation of a Cu-water nanofluid filled cavity in order to investigate the influence of volume fraction and magnetic field specifications on flow and heat transfer

The fluid flow and heat transfer of a nanofluid past a circular cylinder in a rectangular duct under a strong transverse magnetic field is studied numerically using a quasitwo-dimensional model. Transition from laminar flow with separation to creeping laminar flow is determined as a function of Hartmann number and the volume fraction of nanoparticle, as are critical Hartmann number, and the heat transfer from the heated wall to the fluid. Downstream cross-stream mixing induced by the cylinder wake was found to increase heat transfer. The successive changes in the flow pattern are studied as a function of the Hartmann number. Suppression of vortex shedding occurs as the Hartmann number increases.

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Flow and heat transfer of MHD graphene oxide-water nanofluid between two non-parallel walls

Thermal Science ◽

10.2298/tsci150513100a ◽

2017 ◽

Vol 21 (5) ◽

pp. 2095-2104 ◽

Cited By ~ 2

Author(s):

Mohammadreza Azimi ◽

Rouzbeh Riazi

Keyword(s):

Magnetic Field ◽

Heat Transfer ◽

Graphene Oxide ◽

Volume Fraction ◽

Flow And Heat Transfer ◽

S Parameter ◽

Non Linear ◽

Optimal Homotopy Asymptotic Method ◽

Prandtl Numbers ◽

Linear Differential

The steady 2-D heat transfer and flow between two non-parallel walls of a graphene oxide nanofluid in presence of uniform magnetic field are investigated in this paper. The analytical solution of the non-linear problem is obtained by Galerkin optimal homotopy asymptotic method. At first a similarity transformation is used to reduce the partial differential equations modeling the flow and heat transfer to ordinary non-linear differential equation systems containing the semi angle between the plate?s parameter, Reynolds number, the magnetic field strength, nanoparticle volume fraction, Eckert and Prandtl numbers. Finally, the obtained analytical results have been compared with results achieved from previous works in some cases.

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Coupled flow and heat transfer of power-law Nanofluids on a non-isothermal rough rotary disk subject to magnetic field

Chinese Physics B ◽

10.1088/1674-1056/ac46bd ◽

2021 ◽

Author(s):

Yunxian Pei ◽

Xuelan Zhang ◽

Liancun Zheng ◽

Xinzi Wang

Keyword(s):

Magnetic Field ◽

Heat Transfer ◽

Power Law ◽

Numerical Solutions ◽

Volume Fraction ◽

Rotating Disk ◽

Coupled Flow ◽

Friction Coefficients ◽

Nanoparticle Shape ◽

Flow And Heat Transfer

Abstract In this paper, we study coupled flow and heat transfer of power-law nanofluids on a non-isothermal rough rotating disk subject to a magnetic field. The problem is formulated in terms of specified curvilinear orthogonal coordinate system. An improved BVP4C algorithm is proposed and numerical solutions are obtained. The influence of volume fraction, types and shapes of nanoparticles, magnetic field and power-law index on the flow and heat transfer behavior are discussed.<br/>Results show that the power-law exponents (PLE), nanoparticle volume fraction (NVF) and magnetic field inclination angle (MFIA) are almost no effects on velocities in wave surface direction, but have small or significant effects on azimuth direction. NVF have remarkable influence on local Nusselt number (LNN) and friction coefficients (FC) in radial and azimuth directions (AD). LNN increases with NVF while FC in AD decrease. The types of nanoparticles, magnetic field strength and inclination have small effects on LNN, but they have remarkable effects on the friction coefficients with positively correlated while the inclination is negatively correlated with heat transfer rate. The size of the nanoparticle shape factor is positively correlated with LNN.

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