Transient behavior of nano fluid natural convection in equilateral triangular enclosure

الملخص EN

In this work, the unsteady state behavior of natural convection of nanofluid in triangular enclosure was studied.

Numerical solution of laminar convection of Cu-Water nanofluid over a range of Rayleigh numbers (103 –107 ) and volume fraction of nanoparticles (0-20%) were performed.

The Non-dimensional form of the energy and the momentum equations are solved using the commercial package COMSOL (5).

A uniform wall temperature (UWT) boundary condition was subjected to the enclosure.

The base temperature was always higher than the inclined surfaces.

The effects of Rayleigh number on the velocities, temperature and Nusselt number were examined.

The effects of volume fraction of nanoparticles on thermal performance and the stability of the transient behavior of the heat transfer and the fluid flow were examined.

Based on the numerical results, it was shown that the addition of Cu nanoparticles enhanced the heat transfer rate for all values of Rayleigh.

Moreover, it was found that both the stability of the transient behavior of the natural convection and the steady state profiles of temperature and velocities were affected by the existence of the Cu nanoparticles.