Computations of two-phase supersonic nozzle flows by a space-marching method

1983 ◽  
Author(s):  
K. FUJII ◽  
P. KUTLER
Keyword(s):  
Supersonic Nozzle ◽  
Two Phase ◽  
Nozzle Flows ◽  
Marching Method

Three-dimensional, two-phase supersonic nozzle flows

AIAA Journal ◽  
1983 ◽  
Vol 21 (5) ◽  
pp. 671-678 ◽  
Author(s):  
I-Shih Chang
Keyword(s):  
Supersonic Nozzle ◽  
Three Dimensional ◽  
Two Phase ◽  
Nozzle Flows

Effect of Slip Velocity and Heat Transfer on the Condensed Phase Momentum Flux of Supersonic Nozzle Flows

1999 ◽  
Vol 122 (1) ◽  
pp. 14-19 ◽  
Author(s):  
S. A. Sherif ◽  
W. E. Lear ◽  
N. S. Winowich
Keyword(s):  
Heat Transfer ◽  
Momentum Flux ◽  
Slip Velocity ◽  
Figure Of Merit ◽  
Supersonic Nozzle ◽  
Nozzle Design ◽  
Gaseous Nitrogen ◽  
Liquid Phases ◽  
Nozzle Flows ◽  
Phase Momentum

One of the methods used for industrial cleansing applications employs a mixture of gaseous nitrogen and liquid water injected upstream of a converging-diverging nozzle located at the end of a straight wand assembly. The idea is to get the mixture to impact the surface at the maximum momentum flux possible in order to maximize the cleansing effectiveness. This paper presents an analysis geared towards this application in which the effects of slip and heat transfer between the gas and liquid phases are present. The model describes the liquid momentum flux (considered a figure of merit for cleansing) under a host of design conditions. While it is recognized that the emulsification mechanism responsible for cleansing is far more complicated than simply being solely dependent on the liquid momentum flux, the analysis presented here should prove useful in providing sufficiently accurate results for nozzle design purposes. [S0098-2202(00)01801-0]

scholarly journals Numerical Analysis of Dry Ice Blasting Convergent-Divergent Supersonic Nozzle

Energies ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4787 ◽  
Author(s):  
Aleksandra Dzido ◽  
Piotr Krawczyk ◽  
Michalina Kurkus-Gruszecka
Keyword(s):  
Numerical Analysis ◽  
High Speed ◽  
Two Phase Flow ◽  
Supersonic Nozzle ◽  
Phase Flow ◽  
Two Phase ◽  
Dry Ice ◽  
Cleaning Methods ◽  
Industrial Cleaning ◽  
Dry Ice Blasting

There are several well-known and widely used industrial cleaning methods in the market today. One of them is dry ice blasting. In this method, moisture-free air is compressed, mixed with solid CO2 particles, and blasted though a nozzle; in the process, the gas expands, propelling its velocity. The high-speed, two-phase flow cleans by supercooling and crushing particles on the surface, causing dry ice sublimation. As the nozzle is a crucial component of the system, the authors conducted a numerical analysis of the geometry of the proposed convergent-divergent nozzle. A mathematical model of the supersonic, two-phase flow was developed and implemented in commercial Computational Fluid Dynamics (CFD) code. Various operating parameters, such as inlet pressure and dry ice mass flow, were taken into consideration.

The Effects of the Distance Between Nozzle and Substrate on Cold Gas Dynamic Spray Process

2005 ◽  
Author(s):  
Longjian Li ◽  
Wenzhi Cui ◽  
Qinghua Chen ◽  
Tien-Chien Jen ◽  
Quan Liao
Keyword(s):  
Supersonic Nozzle ◽  
Strong Shock ◽  
Two Phase ◽  
Carrier Gas ◽  
Compression Waves ◽  
Spray Process ◽  
Gas Dynamic ◽  
Cold Gas Dynamic Spray ◽  
Gas Dynamic Spray ◽  
Cold Gas

In this paper, numerical simulations were performed for the gas-particle two phase flow in the cold gas dynamic spray process to investigate the acceleration of micro- and nanoparticles with diameters ranging from 100nm to 50μm. Nitrogen (N2) and Helium (He) were chosen as the carrier gas, respectively. The acceleration of carrier gas to particles in the De-Laval-Type supersonic nozzle was strongly dependent on the characteristics of flow field, as well as the densities and the size of the particles. Two kind of particles Copper (Cu) and Platinum (Pt) were chosen as the spraying materials. The computed results showed that the flow structures of the carrier gas were very different for different gas and different spraying distance, which resulted in consequently different accelerating features. The cone-shape weak shocks (compression waves) occurred at the exit of divergent section, and the bow-shaped strong shock wave was found right before the substrate, which played a resistance role to the particles and prevented the smaller particles from approaching on the substrate.

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