Abstract
Forced convection of hybrid Ag–MgO/water nanofluid in a threedimensional Tshaped 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 :

x–y velocity components
 x, y :

Cartesian coordinates
 \(\alpha\) :

Thermal diffusivity
 \(\beta\) :

Expansion coefficient
 \(\phi\) :

Solid volume fraction
 \(\nu\) :

Kinematic viscosity
 \(\theta\) :

Nondimensional temperature
 \(\rho\) :

Density of the fluid
 c:

Cold
 h:

Hot
 m:

Average
 nf:

Nanofluid
 p:

Solid particle
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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 Tshaped cavity considering magnetic field effects. J Therm Anal Calorim (2020). https://doi.org/10.1007/s1097302009348w
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Keywords
 3D vented cavity
 Hybrid nanofluid
 Magnetic field effects
 Finite volume method
 Tshaped cavity