OS21-1 Experimental Study on the Behavior of the two Phase Flow Shock Waves occurring in the Ejector Refrigeration Cycle(Multiphase Shock Wave,OS21 Shock wave and high-speed gasdynamics,FLUID AND THERMODYNAMICS)

2015 ◽  
Vol 2015.14 (0) ◽  
pp. 259
Author(s):  
Haruyuki Nishijima ◽  
Kyohei Tsuchii ◽  
Masafumi Nakagawa
Keyword(s):  
Shock Wave ◽  
Experimental Study ◽  
Shock Waves ◽  
High Speed ◽  
Two Phase Flow ◽  
Refrigeration Cycle ◽  
Phase Flow ◽  
Two Phase

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

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.

Experimental study on the pressure fluctuation caused by two phase flow shock wave at the nozzle outlet.

2016 ◽  
Vol 2016 (0) ◽  
pp. C133 ◽  
Author(s):  
Kazuyoshi Sadamura ◽  
Haruyuki Nishijima ◽  
Yosuke Kawamura ◽  
Masafumi Nakagawa
Keyword(s):  
Shock Wave ◽  
Experimental Study ◽  
Pressure Fluctuation ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Nozzle Outlet ◽  
Two Phase

scholarly journals Experimental study on the pressure fluctuation caused by two-phase flow shock wave at the nozzle outlet

2017 ◽  
Vol 83 (851) ◽  
pp. 17-00192-17-00192
Author(s):  
Haruyuki NISHIJIMA ◽  
Kazuyoshi SADAMURA ◽  
Yosuke KAWAMURA ◽  
Masafumi NAKAGAWA
Keyword(s):  
Shock Wave ◽  
Experimental Study ◽  
Pressure Fluctuation ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Nozzle Outlet ◽  
Two Phase

Compressibility Effects in the Gas Phase for Unsteady Annular Two-Phase Flow in a Microchannel

2006 ◽  
Author(s):  
Alexandru Herescu ◽  
Jeffrey S. Allen
Keyword(s):  
Shock Wave ◽  
Gas Phase ◽  
High Speed ◽  
Gas Flow ◽  
Two Phase Flow ◽  
Flow Behavior ◽  
Flow Section ◽  
Phase Flow ◽  
Two Phase ◽  
Gas Liquid Flow

High speed microscopy experiments investigating two-phase (gas-liquid) flow behavior in capillary-scale systems, that is, systems where capillary forces are important relative to gravitational forces, have revealed a unique unsteady annular flow with periodic destabilization of the gas-liquid interface. Standing waves develop on the liquid film and grow into annular lobes similar with those observed in low-speed two-phase flow. The leading face of the lobe will decelerate and suddenly become normal to the wall of the capillary, suggesting the possibility of a shock wave in the gas phase at a downstream location from the minimum gas flow section. Visualization of the naturally occurring convergent-divergent nozzle-like structures as well as a discussion on the possibility of shock wave formation are presented.

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