Numerical Simulation of Natural Convection in a Square Cavity Utilizing Nanofluid and Subjected to Air Stream Cooling
Basrah Journal for Engineering Science,
Volume 18, Issue 2, Pages 15-25
AbstractIn the present paper the natural convection in a square
cavity utilizing Cu-water nanofluid is examined numerically.
The cavity is exposed to cooling air stream with free stream
temperature (T∞) from left wall and its right and bottom walls
kept with cold and hot temperatures (TC) and (TH) respectively,
while the cavity top wall considered as adiabatic. The nanofluid
flow inside the cavity is assumed to be laminar and obeying to
Boussinesq approximation. The governing equations are solved
by finite volume method using ANSYS FLUENT code. The
results are accomplished with a range of nanofluid volume
fraction =0–0.16, Rayleigh number Ra=103–105 and free
stream Reynolds number Re∞=103–104. The effects of these
variables are displayed on the stream function (), isotherms ()
contours and average Nusselt number (Nuavg). The results show
the heat transfer rate augmented with increasing , Ra and Re∞.
Also, the increment in both and Ra increases the circulation
inside the cavity while increasing Re∞ produces secondary
vortices and reduces circulation at the main vortex of the cavity.
The results of local Nusselt number (Nu) and isotherms () are
compared with other studies and show good agreement with
maximum error values 14.28% and 3.2% respectively.
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