RT Journal Article
ID 2386ae89684fcd0f
A1 Abdel-Fattah, A.
T1 Numerical Study of Buoyancy-Opposed Wall Jet Flow
JF Heat Transfer Research
JO HTR
YR 2010
FD 2010-04-16
VO 41
IS 2
SP 137
OP 153
K1 gas-cooled nuclear reactors
K1 opposed flow jet
K1 two-dimensional turbulent jet
K1 recirculation zone
K1 turbulence production
K1 heat transfer
AB This paper describes a numerical study of the flow and thermal fields for an opposed wall jet. The hot water is injected from a plane jet down one wall of a vertical passage of a rectangular cross section into cooled water which moves slowly upward. The flow is assumed to be two-dimensional, steady, incompressible, and turbulent. The finite volume scheme is used to solve the continuity equation, momentum equations, energy equation, and *k−ε* model equations. The flow characteristics were studied by varying the Richardson number (0.0 ≤ Ri ≤ 0.052) and the ratio of background velocity to jet velocity (0.05 ≤ R ≤ 0.15). The results showed that the buoyancy limited the downward penetration of the jet and its lateral spread when the Richardson number increased. The shear layer formed at the interface between the two flow streams, and it became more concentrated at higher values of the Richardson number. In this region, the intensity of the turbulence became stronger and the turbulent shear stress had a minimum value. When the velocity ratio increased, the penetration of jet decreases, its lateral spreading becomes less. Also the temperature difference decreases with the velocity ratio increase. The numerical results give a good agreement with the experiment data of [1].
PB Begell House
LK http://dl.begellhouse.com/journals/46784ef93dddff27,3ceee2e33d1532a9,2386ae89684fcd0f.html