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Impact of a rotating cone on forced convection of Ag–MgO/water hybrid nanofluid in a 3D multiple vented T-shaped cavity considering magnetic field effects

Abstract

Forced convection of hybrid Ag–MgO/water nanofluid in a three-dimensional T-shaped vented cavity with multiple ports under the effects of a inner rotating cone and magnetic field is numerically studied with finite volume method. The simulation is performed for various values of parameters such as: Reynolds number (between 100 and 1000), Hartmann number (between 0 and 60), angular velocity of the rotating cone (between − 200 rad/s and 0), aspect ratio of the circular cylinders of the base of the cone (between 0.5 and 2) and nanoparticle solid volume fraction of the hybrid nanofluid (\(\phi _1\) between 0 and 0.01, \(\phi _2\) between 0 and 0.01). It was observed that the average heat transfer rate rises with higher values of Reynolds number, Hartmann number above a specified value, angular rotational speed of the cone, aspect ratio of the cone for values above 1 and solid nanoparticle volume fractions of the hybrid particles. In total, 61% of average heat transfer enhancement for left horizontal upper surface is achieved with the imposed magnetic field. The enhancement in the average Nusselt numbers is 25.6% for the rotating cone at the highest angular velocity as compared to a motionless one. The average heat transfer increases almost linearly with hybrid solid nanoparticle volume fraction, while 8.96% and 15.52% enhancements are obtained for varying the solid volume fraction of the particles with the lower and higher thermal conductivity up to 0.01.

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Abbreviations

Ha:

Hartmann number

H :

Size of the cavity

h :

Local heat transfer coefficient

k :

Thermal conductivity

n :

Unit normal vector

\(\hbox {Nu}_\mathrm{s}\) :

Local Nusselt number

\(\hbox {Nu}_\mathrm{m}\) :

Average Nusselt number

p :

Pressure

Pr:

Prandtl number

R :

Normalized residual

Pr:

Reynolds number

T :

Temperature

u, v :

xy velocity components

x, y :

Cartesian coordinates

\(\alpha\) :

Thermal diffusivity

\(\beta\) :

Expansion coefficient

\(\phi\) :

Solid volume fraction

\(\nu\) :

Kinematic viscosity

\(\theta\) :

Non-dimensional temperature

\(\rho\) :

Density of the fluid

c:

Cold

h:

Hot

m:

Average

nf:

Nanofluid

p:

Solid particle

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Correspondence to Fatih Selimefendigil.

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Selimefendigil, F., Öztop, H.F. Impact of a rotating cone on forced convection of Ag–MgO/water hybrid nanofluid in a 3D multiple vented T-shaped cavity considering magnetic field effects. J Therm Anal Calorim (2020). https://doi.org/10.1007/s10973-020-09348-w

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Keywords

  • 3D vented cavity
  • Hybrid nanofluid
  • Magnetic field effects
  • Finite volume method
  • T-shaped cavity