The effects of ground wall-jet characteristics on fountain upwash flow formation and development

1981 ◽  
Author(s):  
D. KOTANSKY ◽  
L. GLAZE
Keyword(s):  
Wall Jet ◽  
Flow Formation ◽  
Jet Characteristics

scholarly journals Study on Mechanism of Series-Flow of Pollutants between Consecutive Tunnels by Numerical Simulation

2019 ◽  
Vol 9 (19) ◽  
pp. 4125
Author(s):  
Honghu Zhang ◽  
Yunge Hou ◽  
Kaijie Wu ◽  
Tianhang Zhang ◽  
Ke Wu ◽  
...  
Keyword(s):  
Negative Pressure ◽  
Velocity Ratio ◽  
Three Dimensional ◽  
Wall Jet ◽  
Air Velocity ◽  
Pressure Area ◽  
Computational Fluid Dynamics Cfd ◽  
Jet Theory ◽  
Jet Characteristics ◽  
Tunnel Entrance

The characteristics of series-flow between two consecutive tunnels with distance ranging from 20 m to 250 m are explored by computational fluid dynamics (CFD) parametric simulations of structure and operation parameters. The research indicates that series-flow can be considered the three-dimensional wall jet diffusion of upstream tunnel pollutants under the effects of the negative pressure area of the downstream tunnel entrance. The jet characteristics are primarily related to the tunnel distance between upstream and downstream tunnels and hydraulic diameters, and only influenced by the negative pressure in the area very close to downstream entrance where the tunnel air velocity ratio, i.e., the velocity of upstream tunnel air divided by the velocity of downstream tunnel air, decides the degree of the influence. If ignoring the effects of ambient wind and traffic flow, the series-flow ratio decreases with the increasing of parameters of the normalized tunnel distance, i.e., the tunnel distance divided by tunnel hydraulic diameter, and the tunnel air velocity ratio. Based on the three-dimensional wall jet theory, a series-flow model covering all jet characteristic sections is built. The experiment results indicate that the model applies to consecutive tunnels with any spacing and exhibits higher prediction accuracy.

scholarly journals Flow Analysis of Laminar Wall Jet over Curved Cavity with a Channel Mounted Fin

2019 ◽  
Vol 8 (3) ◽  
pp. 1876-1882 ◽  
Keyword(s):  
Flow Analysis ◽  
Flow Characteristics ◽  
Circuit Board ◽  
Momentum Balance ◽  
Jet Flows ◽  
Wall Jet ◽  
Fluid Flow Characteristics ◽  
Wall Jet Flow ◽  
Jet Characteristics ◽  
Fin Length

Wall jet flow is used for industrial cooling process, cooling of electronic component mounted on circuit board etc. Numerical simulations have been carried out for laminar two dimensional wall jet flows along curved cavity having a channel mounted thin fin. The commercial finite volume code FLUENT is chosen to resolve the mass balance and momentum balance equations. Fluid flow characteristics are investigated for different Reynolds number (Re=100 to 600) and for different fin geometry. The results are plotted in the form of velocity profiles and streamline contours. The effect of fin length on the laminar wall jet characteristics is also investigated.

NUMERICAL INVESTIGATION OF CONJUGATE HEAT TRANSFER FROM LAMINAR WALL JET FLOW OVER A SHALLOW CAVITY

2018 ◽  
Vol 49 (12) ◽  
pp. 1151-1170 ◽  
Author(s):  
Maheandera Prabu Paulraj ◽  
Rajesh Kanna Parthasarathy ◽  
Jan Taler ◽  
Dawid Taler ◽  
Pawel Oclon ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Numerical Investigation ◽  
Conjugate Heat Transfer ◽  
Jet Flow ◽  
Wall Jet ◽  
Shallow Cavity ◽  
Wall Jet Flow

CFD MODELING OF THE INTERACTION BETWEEN AN OBLIQUE WALL JET AND A PARALLEL OFFSET JET

2019 ◽  
Vol 46 (2) ◽  
pp. 101-112
Author(s):  
Nidhal Hnaien ◽  
Saloua Marzouk ◽  
Lioua Kolsi ◽  
Hatem Gasmi ◽  
Habib Ben Aissia ◽  
...  
Keyword(s):  
Cfd Modeling ◽  
Wall Jet ◽  
Offset Jet
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