CFD analysis of a turbulent jet behavior induced by a steam jet discharge through a single hole in a subcooled water tank

2010 ◽  
Vol 240 (9) ◽  
pp. 2160-2168 ◽  
Author(s):  
Hyung Seok Kang ◽  
Chul-Hwa Song
Keyword(s):  
Turbulent Jet ◽  
Water Tank ◽  
Cfd Analysis ◽  
Subcooled Water ◽  
Single Hole ◽  
Jet Behavior

Vertical Mixed Jet Behavior of Orifice Nozzle

2014 ◽  
Vol 1070-1072 ◽  
pp. 1978-1981
Author(s):  
Lu Peng ◽  
Dong Jun Kim ◽  
Hei Cheon Yang
Keyword(s):  
Flow Rate ◽  
High Speed ◽  
Water Tank ◽  
Entrainment Ratio ◽  
Penetration Length ◽  
Air Compressor ◽  
Primary Fluid ◽  
Experimental Apparatus ◽  
Jet Behavior ◽  
Transfer Behavior

The objective of this study is to experimentally investigate the mixed jet and oxygen transfer behavior of a vertical orifice nozzle. The experimental apparatus consisted of an electric motor-pump, an orifice nozzle, a circulation water tank, an air compressor, a high speed camera unit and controlling or measuring accessories. The entrainment ratio was calculated using the measured primary fluid flow rate and suction air flow rate with primary flow pressure. The visualization image of vertically injected air and mixed jet issuing from the orifice nozzle was analyzed qualitatively. As the air compressor pressure increases, the penetration length of mixed jet decreases and the mass ratio and dissolved oxygen concentration increase.

Experimental study on a steam-driven turbulent jet in subcooled water

2010 ◽  
Vol 240 (10) ◽  
pp. 3259-3266 ◽  
Author(s):  
Xin-Zhuang Wu ◽  
Jun-Jie Yan ◽  
Wen-Jun Li ◽  
Dong-Dong Pan ◽  
Guang-Yao Liu
Keyword(s):  
Experimental Study ◽  
Turbulent Jet ◽  
Subcooled Water

Thermal Interaction of Lead-Alloy Droplet With Subcooled Water in Pool Water Tank

2010 ◽  
Author(s):  
Rongyuan Sa ◽  
Minoru Takahashi
Keyword(s):  
High Speed ◽  
Interface Temperature ◽  
Water Tank ◽  
Lead Alloy ◽  
Transient Pressure ◽  
Alloy Droplet ◽  
Subcooled Water ◽  
Pool Water ◽  
Film Instability ◽  
Experimental Apparatus

Visualization test was conducted by designing and setting up a special experimental apparatus to investigate characteristics of thermal-hydraulic interaction between lead-alloy droplet and subcooled water in pool water tank. The violent boiling phenomena were observed by a high-speed camera and local transient pressure was measured by high frequency piezo pressure transducer. The results showed that violent boiling mainly occurred when interface temperature between droplet and water was higher than homogenous nucleation temperature of water and subcooling temperature of water was higher than 40K. A violent boiling model for lead-alloy droplet/water interaction was proposed. In the model, partial contact of lead-alloy droplet with water caused by vapor film instability was taken into account to simulate fragmentation due to rapid evaporation.

Nozzle Geometry Effect on Stratified Layer Erosion by Vertical Turbulent Jet

2017 ◽  
Vol 3 (3) ◽  
Author(s):  
L. Ishay ◽  
U. Bieder ◽  
G. Ziskind ◽  
A. Rashkovan
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Jet Impingement ◽  
Turbulent Jets ◽  
Turbulent Jet ◽  
Severe Accident ◽  
Nozzle Geometry ◽  
Correct Prediction ◽  
Jet Mixing ◽  
Jet Behavior

Knowledge of the nuclear power plants (NPPs) containment atmosphere composition in the course of a severe accident is crucial for the effective design and positioning of the hydrogen explosion countermeasures. This composition strongly depends on containment flows which may include turbulent jet mixing in the presence of buoyancy, jet impingement onto the stratified layer, stable stratification layer erosion, steam condensation on the walls of the containment, condensation by emergency spray systems and other processes. Thus, in modeling of containment flows, it is essential to correctly predict these effects. In particular, a proper prediction of the turbulent jet behavior before it reaches the stably stratified layer is critical for the correct prediction of its mixing and impingement. Accordingly, validation study is presented for free neutral and buoyancy-affected turbulent jets, based on well-known experimental results from the literature. This study allows for the choice of a proper turbulence model to be applied for containment flow simulations. Furthermore, the jet behavior strongly depends on the issuing geometry. A comparative study of erosion process for the conditions similar to the ones of international benchmark exercise (IBE-3) is presented for different jet nozzle shapes.

Influence of Laminar Wall Boundary Layers on Turbulent Jet Behavior

1976 ◽  
Vol 98 (4) ◽  
pp. 773-775
Author(s):  
Peter O. Witze ◽  
Harry A. Dwyer
Keyword(s):  
Boundary Layers ◽  
Turbulent Jet ◽  
Wall Boundary ◽  
Jet Behavior

Prediction of the Trajectory of a Turbulent Jet Injected Into a Crossflowing Stream

1976 ◽  
Vol 98 (4) ◽  
pp. 667-672 ◽  
Author(s):  
J. Sucec ◽  
W. W. Bowley
Keyword(s):  
Experimental Data ◽  
Turbulent Jet ◽  
Two Dimensional ◽  
Conservation Equations ◽  
Jet Behavior ◽  
Crossflow Velocity ◽  
Data Yield ◽  
Good Agreement

A semianalytical prediction of the trajectory of a turbulent jet issuing at various angles to the horizontal into a crossflowing stream is presented. The predictive technique utilizes the basic conservation equations, in conjunction with idealizations instigated by experimentally observed jet behavior, to arrive at two-dimensional trajectories in either a uniform or a spatially variable mainstream crossflow. Comparisons of the predictions with available experimental data yield good agreement over a range of jet to crossflow velocity ratios of two to eighteen.

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