JP Journal of Heat and Mass Transfer
Volume 16, Issue 1, Pages 149 - 166
(February 2019) http://dx.doi.org/10.17654/HM016010149 |
|
NUMERICAL SIMULATION OF THE PARTIAL THERMAL ZONES INFLUENCE ON NATURAL CONVECTION HEAT TRANSFER INSIDE ENCLOSURE FILLED WITH NANOFLUIDS
Hasan Sh. Majdi, Ammar Abdulkadhim, Azher M. Abed and Doaa Fadhil
|
Abstract: This study examined numerically the natural convection heat transfer in enclosure filled with various types of nanofluids with partial active walls. The governing equations of Navier-Stokes and energy have been solved using finite element method. Two cases of thermal active walls are considered for various Rayleigh numbers 103 ≤ Ra ≤ 106, nanofluid type like Cu, Al2O3 and TiO2 and aspect ratio 0.5 ≤ AR ≤ 2. The left sidewall is partially cooled while the right sidewall is partially heated. The other walls and remaining portions are considered adiabatic. Depending upon the location of active zones, various cases can be considered. In this work, we limited into two different cases: top-bottom (case-1) and bottom-top (case-2) active walls. The numerical programme is validated with significant researchers in terms of average Nusselt number to obtain the accuracy of the programme. The results are presented in terms of streamlines, isotherms, local and average Nusselt number. The obtained results indicate that case-1 gives better heat transfer characteristic in a comparison with case-2. Also, Cu gives better heat transfer rate with other two types. It is obtained that as the aspect ratio increases, the mean Nusselt number decreases in both the cases. |
Keywords and phrases: natural convection, nanofluid, case-1, case-2, finite element method.
|
|
Number of Downloads: 335 | Number of Views: 2233 |
|