Open Access
ARTICLE
NUMERICAL INVESTIGATION OF NATURAL CONVECTION HEAT TRANSFER IN A PARALLELOGRAMIC ENCLOSURE HAVING AN INNER CIRCULAR CYLINDER USING LIQUID NANOFLUID
Hasan Sh. Majdia
, Ammar Abdulkadhimb,*
, Azher M. Abedb
a Department of Chemical Engineering and Petroleum Industries, Al-Mustaqbal University College, Babylon, 51001, Iraq
b Air conditioning and Refrigeration Techniques Engineering Department, Al-Mustaqbal University College, Babylon, 51001, Iraq
* Corresponding Author: Email:
Frontiers in Heat and Mass Transfer 2019, 12, 1-14. https://doi.org/10.5098/hmt.12.2
Abstract
Fluid flow and natural convection heat transfer in a parallelogram enclosure with an inner circular cylinder using Cu-water nanofluid are studied
numerically. Dimensionless Navier-Stokes and energy equations are solved numerically using finite element method based two-dimensional flow and
steady-state conditions. This study evaluates the effect of different concentrations of Cu-water nanofluids (0% to 6%) with different Rayleigh
numbers 10
3 ≤ Ra ≤ 10
6 under isotherm wall temperatures. The effects of geometrical parameters of the parallelogram enclosure (inclination angle in
range of 0 ≤ α ≤ 30 and location of inner circular cylinder -0.2 ≤ H ≤ +0.2 on the flow field and heat transfer are examined. The results are
presented in terms of streamlines, isotherms, local and average Nusselt number. It is found that the inclination angle has a significant effect on flow
pattern and heat transfer and the inclination angle of 30o at a vertical location H=-0.2 gives better fluid flow strength. Moreover, the maximum heat
transfer enhancement is obtained when the circular cylinder moves vertically downward up to H=-0.1 and the inclination angle is 30o
. The results
also indicate that as the Rayleigh number, nanofluid concentration increase, the rate of heat transfer will increase.
Keywords
Cite This Article
Majdi, H. S. (2019). NUMERICAL INVESTIGATION OF NATURAL CONVECTION HEAT TRANSFER IN A PARALLELOGRAMIC ENCLOSURE HAVING AN INNER CIRCULAR CYLINDER USING LIQUID NANOFLUID.
Frontiers in Heat and Mass Transfer, 12(1), 1–14.