THE ENHANCEMENT OF NATURAL CONVECTION HEAT TRANSFER IN CYLINDRICAL COMPOSITE LAMINATE ENCLOSURE WITH POROUS MEDIA BY USING CARBON NANOTUBES
Noor H. Dhaher, Furkan Kamil, Hayder H. Khaleel
Engineering Technical College / Najaf, Al- Furat Al-Awsat Technical University, 31001 Al-Najaf, Iraq
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Numerical analysis was presented in this current work for fluid flow and a steady natural convection heat transfer in a graphite/epoxy laminated composite annulus enclosure of three dimensions. Carbon nanotubes with base fluid of water and ethylene glycol were considered for simulation. The nanofluid flow pass through glass beads like a porous medium in the midst of two horizontal coaxial cylinders, in addition to fins which were attached to the inner hot cylinder. The solution of governing equations was presented by using finite difference approximation; furthermore, the results were gotten by employing the MATLAB software. The results described in expressions of local Nusselt number, temperature fields and the rate of Nusselt number on the hot wall and cold wall cylinders with developed Rayleigh number (10 𝑅𝑎 1000), nanotubes volume fraction (0 0.4), and abased fluid of ethylene glycol and water in percent of (0 EG 90). It could be concluded that by raising the Rayleigh number, the rate Nusselt number increased. Moreover, adding of carbon nanotubes on base fluid cause to improve flow strength with the heat transfer. The main reason of the improvement of heat transfer was the presence of carbon nanotubes with high value of Rayleigh number which was more considerable than carbon nanotubes with low value of Rayleigh number.