Thermal-Hydraulic Response in the Discharge Piping With Water Pool

2002 ◽  
Author(s):  
Young S. Bang ◽  
Hyung J. Ahn ◽  
In-G. Kim ◽  
Hho J. Kim
Keyword(s):  
Wave Propagation ◽  
Pressure Wave ◽  
Affecting Factors ◽  
Water Pool ◽  
Relief Valve ◽  
Propagation Behavior ◽  
Factors Influencing ◽  
Simple Geometry ◽  
Valve Opening ◽  
Hydraulic Response

Thermal-hydraulic response in the discharge piping at the upstream of water pool following the opening of the safety relief valve is analyzed. To predict the basic pressure wave propagation and interaction with reflection wave, the RELAP5/MOD3 code is used. Pressure wave propagation behavior in a simple geometry is calculated and the effect of the important parameters including the loss factor, the pipe configuration, the water slug inflow, the valve opening time, and subdivision of sparger are investigated. And the affecting factors influencing the pressure wave propagation and their mechanisms are discussed.

Investigation on the Controlling Factors of Pressure Wave Propagation Behavior Induced by Pulsating Hydraulic Fracturing

SPE Journal ◽  
2021 ◽  
pp. 1-20
Author(s):  
Yanan Hou ◽  
Yan Peng ◽  
Zhangxin Chen ◽  
Yishan Liu ◽  
Guangqing Zhang ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Hydraulic Fracturing ◽  
Resonance Frequency ◽  
Pressure Wave ◽  
Controlling Factors ◽  
Resonance Phenomenon ◽  
Loading Frequency ◽  
Injection Mode ◽  
Propagation Behavior ◽  
Resonance Frequencies

Summary Pulsating hydraulic fracturing (PHF) is a promising fracturing technology for unconventional reservoirs because it could improve the hydraulic fracturing efficiency through inducing the fatigue failure of reservoir rocks. Understanding of the pressure wave propagation behavior in wellbores and fractures plays an important role in PHF optimization. In this paper, a transient flow model (TFM) was used to describe the physical process of pressure wave propagation induced by PHF, and this model was solved by the method of characteristics (MOC). Combination of the TFM and MOC was validated with experimental data. The impacts of controlling factors on the pressure wave propagation behavior were fully discussed, and these factors include the frequency of input loading, an injection mode, an injection position, and friction. More than 10,000 sets of pressure wave propagation behaviors in different scenarios were simulated, and their differences were illustrated. In addition, the generation mechanisms of different pressure wave propagation behaviors were explained by the Fourier transform theory and the vibration theory. The important finding is that there is resonance phenomenon in the propagation of the pressure wave, and the resonance frequencies are almost equal to the natural frequencies of a fluid column. As a consequence of resonance phenomenon, the amplitudes of bottomhole pressure (BHP) and fracture tip pressure will increase sharply when the input loading frequency is close to the resonance frequency and less than 5 Hz; otherwise, the resonance phenomenon will disappear. Furthermore, an injection mode can alter the resonance frequency and the amplitude and frequency of the induced pressure wave. In addition, a friction effect can significantly decrease both the resonance frequency and the resonance amplitude. These findings indicate that the optimized input loading frequency should be close to the natural frequency of a fracturing fluid in a wellbore to enhance its BHP.

scholarly journals Pressure wave propagation in a granular bed

2005 ◽  
Vol 72 (3) ◽  
Author(s):  
Stephen R. Hostler ◽  
Christopher E. Brennen
Keyword(s):  
Wave Propagation ◽  
Pressure Wave ◽  
Granular Bed

Prediction of the Flow and Force Characteristics of Safety Relief Valves

2006 ◽  
Author(s):  
W. Dempster ◽  
C. K. Lee ◽  
J. Deans
Keyword(s):  
Operating Conditions ◽  
Cfd Analysis ◽  
Flow Conditions ◽  
Relief Valve ◽  
Good Correspondence ◽  
Geometry Modeling ◽  
Valve Opening ◽  
Satisfactory Prediction ◽  
Force Characteristics

The design of safety relief valves depends on knowledge of the expected force-lift and flow-lift characteristics at the desired operating conditions of the valve. During valve opening the flow conditions change from seal-leakage type flows to combinations of sub-sonic and supersonic flows It is these highly compressible flow conditions that control the force and flow lift characteristics. This paper reports the use of computational fluid dynamics techniques to investigate the valve characteristics for a conventional spring operated 1/4” safety relief valve designed for gases operating between 10 and 30 bar. The force and flow magnitudes are highly dependent on the lift and geometry of the valve and these characteristics are explained with the aid of the detailed information available from the CFD analysis. Experimental determination of the force and flow lift conditions has also been carried out and a comparison indicates good correspondence between the predictions and the experiment. However, attention requires to be paid to specific aspects of the geometry modeling including corner radii and edge chamfers to ensure satisfactory prediction.

scholarly journals Pressure wave propagation in bubbly liquid.

1990 ◽  
Vol 56 (525) ◽  
pp. 1237-1243
Author(s):  
Yoichro MATSUMOTO ◽  
Hideji NISHIKAWA ◽  
Hideo OHASHI
Keyword(s):  
Wave Propagation ◽  
Pressure Wave ◽  
Bubbly Liquid
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