scholarly journals DAM-BREAK SHOCK WAVES WITH FLOATING DEBRIS: EXPERIMENTALANALYSIS AND TWO-PHASE MODELLING

2008 ◽  
Vol 39 (2) ◽  
pp. 7
Author(s):  
Stefano Mambretti ◽  
Daniele De Wrachien ◽  
Enrico Larcan
Keyword(s):  
Shock Waves ◽  
Dam Break ◽  
Two Phase

Features of spatial shock-wave flows in vapor-gas-liquid mixtures

2014 ◽  
Vol 10 ◽  
pp. 27-31
Author(s):  
R.Kh. Bolotnova ◽  
U.O. Agisheva ◽  
V.A. Buzina
Keyword(s):  
Shock Wave ◽  
High Pressure ◽  
Shock Waves ◽  
Liquid Mixture ◽  
Liquid Mixtures ◽  
Pressure Vessels ◽  
Water Mixture ◽  
Two Dimensional ◽  
Nonstationary Processes ◽  
Two Phase

The two-phase model of vapor-gas-liquid medium in axisymmetric two-dimensional formulation, taking into account vaporization is constructed. The nonstationary processes of boiling vapor-water mixture outflow from high-pressure vessels as a result of depressurization are studied. The problems of shock waves action on filled by gas-liquid mixture volumes are solved.

Analysis of Transient Two-Phase Flow in Pressure Safety Valve Outlet Headers

2018 ◽  
Author(s):  
Maral Taghva ◽  
Lars Damkilde
Keyword(s):  
Steady State ◽  
Shock Waves ◽  
High Speed ◽  
Two Phase Flow ◽  
Safety Valve ◽  
Strong Shock ◽  
Flow Property ◽  
Phase Flow ◽  
Transient Pressure ◽  
Two Phase

To protect a pressurized system from overpressure, one of the most established strategies is to install a Pressure Safety Valve (PSV). Therefore, the excess pressure of the system is relieved through a vent pipe when PSV opens. The vent pipe is also called “PSV Outlet Header”. After the process starts, a transient two-phase flow is formed inside the outlet header consisting of high speed pressurized gas interacting with existing static air. The high-speed jet compresses the static air towards the end tail of the pipe until it is discharged to the ambiance and eventually, the steady state is achieved. Here, this transient process is investigated both analytically and numerically using the method of characteristics. Riemann’s solvers and Godunov’s method are utilized to establish the solution. Propagation of shock waves and flow property alterations are clearly demonstrated throughout the simulations. The results show strong shock waves as well as high transient pressure take place inside the outlet header. This is particularly important since it indicates the significance of accounting for shock waves and transient pressure, in contrast to commonly accepted steady state calculations. More precisely, shock waves and transient pressure could lead to failure, if the pipe thickness is chosen only based on conventional steady state calculations.

scholarly journals Experimental study on the behavior of the two phase flow shock waves occurring in the ejector refrigeration cycle

2016 ◽  
Vol 3 (6) ◽  
pp. 16-00255-16-00255 ◽  
Author(s):  
Haruyuki NISHIJIMA ◽  
Kyohei TSUCHII ◽  
Masafumi NAKAGAWA
Keyword(s):  
Experimental Study ◽  
Shock Waves ◽  
Two Phase Flow ◽  
Refrigeration Cycle ◽  
Phase Flow ◽  
Two Phase

Numerical Simulation of Shock Waves through Combustible Two-Phase Media

1995 ◽  
pp. 191-196
Author(s):  
A. Koichi Hayashi ◽  
Takayuki Fuyuto ◽  
Toshi Fujiwara
Keyword(s):  
Numerical Simulation ◽  
Shock Waves ◽  
Two Phase

On shock waves in two-phase flow: effects of inter-phase heat transfer and slip

1999 ◽  
Vol 45 (11) ◽  
pp. 687-696
Author(s):  
W.E. Lear ◽  
C.R. Jackson ◽  
S.A. Sherif
Keyword(s):  
Heat Transfer ◽  
Shock Waves ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Flow Effects

scholarly journals Near-source characteristics of two-phase gas–solid outbursts in roadways

2020 ◽  
Author(s):  
Aitao Zhou ◽  
Meng Zhang ◽  
Kai Wang ◽  
Derek Elsworth
Keyword(s):  
Shock Waves ◽  
Numerical Models ◽  
Gas Flows ◽  
Far Field ◽  
Two Phase ◽  
Emergency Rescue ◽  
Source Characteristics ◽  
Basic Parameters ◽  
Significant Attenuation ◽  
Coal And Gas Outbursts

Abstract Coal and gas outbursts compromise two-phase gas–solid mixtures as they propagate as shock waves and flows from their sources. Propagation is influenced by the form of the outburst, proximity to source, the structure and form of the transmitting roadways and the influence of obstacles. The following characterizes the propagation of coal and gas outbursts as two-phase gas–solid flows proximal to source where the coupled effects of pulverized coal and gas flows dominate behavior. The characteristics of shock wave propagation and attenuation were systematically examined for varied roadway geometries using experiments and numerical models. The results demonstrate that the geometry of roadway obstructions is significant and may result in partial compression and sometimes secondary overpressurization in blocked and small corner roadways leading to significant attenuation of outburst shock waves. The shock waves attenuate slowly in both straight and abruptly expanding roadways and more significantly in T-shaped roadways. The most significant attenuation appears in small angle corners and bifurcations in roadways with the largest attenuation occurring in blocked roadways. These results provide basic parameters for simplifying transport in complex roadway networks in the far-field, and guidance for the design of coal and gas outburst prevention facilities and emergency rescue.

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