Air–water counter-current slug flow data in vertical-to-horizontal pipes containing orifice type obstructions

Teyssedou, A.; Önder, E. Nihan; Tye, P.

doi:10.1016/j.ijmultiphaseflow.2005.03.005

Cited by 9 publications

(5 citation statements)

References 15 publications

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“…Some researchers also conducted countercurrent flow experiments in a channel with flow obstructions to evaluate the influence of the obstructions on CCFL [20][21][22][23][24]. Sun [20] carried out two-phase countercurrent flow experiments in a BWR bundle model.…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

“…They found that the orifice placed in the horizontal section generally lowered flooding gas velocities, with the greatest effect noted for the smallest orifice tested. Later, Teyssedou et al [24] presented experimental data regarding air-water countercurrent slug flow in vertical-to-horizontal pipes containing orifice type obstructions to characterize slug flow occurring due to the hydrodynamic interaction between an elbow and an orifice located in a horizontal pipe. They stated that the position of the orifice does not affect the onset of flooding and slugging.…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

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Countercurrent Flow Limitation in a Pipeline with an Orifice

Zhao

Wang

et al. 2022

Energies

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Countercurrent flow limitation (CCFL) refers to an important class of gravity-induced hydrodynamic processes that impose a serious restriction on the operation of gas–liquid two-phase systems. In a nuclear power plant, CCFL may occur in the liquid level measurement system where an orifice is applied in the pipeline, which may introduce error into the level measurement system. CCFL can occur in horizontal, vertical, inclined, and even much more complicated geometric patterns, and the hot-leg channel flow passage has been widely investigated; however, a pipeline with variable cross-sections, including an orifice, has not yet been investigated. An experimental investigation has been conducted in order to identify the phenomenon, pattern, and mechanism of CCFL onset in this type of geometry. Both visual and quantified experiments were carried out. A high-speed camera was applied to capture the flow pattern. Visual experiments were implemented at atmospheric pressure, while quantified pressurizer experiments were implemented at higher pressures. It was determined that if the condensate drainage is low and the liquid level is also low, with a stable stratified flow upstream of the orifice, there is no oscillation of the differential pressure. However, at higher condensate drainage levels, when the liquid level increases, a stratified wavy flow occurs. One of these waves can suddenly rise upstream of the orifice to choke it, which subsequently gives rise to differential pressure across the orifice, with periodic variation. This pattern alternately features stratified flow, stratified wavy flow, and slug flow, which indicates the occurrence of CCFL. The CCFL occurring under these experimental conditions can be expressed as a Wallis type correlation, where the coefficients m and C are 0.682 and 0.601, respectively.

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Section: Experimental Setup and Proceduresmentioning

confidence: 99%

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

Countercurrent Flow Limitation in a Pipeline with an Orifice

Zhao

Wang

et al. 2022

Energies

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“…If the rate of drainage pressure reduction is too fast, there will be stress sensitive effect and speed sensitive formation, and may enter the gaswater two-phase flow stage too early, resulting in porosity and permeability deterioration, coal crushing, formation of fine coal and pulverized coal, seepage resistance enhancement and other issues. It will slow down the propagation of pressure drop (Palmer and Mansoori, 1998;Teyssedou et al, 2005;Li et al, 2009;Salmachi and Karacan, 2017;Yarmohammadtooski et al, 2017). The seam permeability, porosity and compression coefficient as well as the water drainage time would have high influences to the pressure drop speed at each point in the seam.…”

Section: Introductionmentioning

confidence: 99%

Propagation of pressure drop in coalbed methane reservoir during drainage stage

Qiu

et al. 2019

Adv. Geo-Energ. Res.

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Numerical simulation was employed to investigate the propagation speed of pressure drop at the drainage stage in coalbed methane (CBM) reservoirs. A seepage model of singlephase water in CBM reservoirs was generated with the parameter from CBM well ZS39 in the Zhengzhuang block of the southern Qinshui Basin. The effects of stress sensitivity and reservoir properties on the pressure drop propagation process were analysed. Moreover the pressure drop funnel scale index was introduced to quantitatively characterize the propagation process. The results indicate that stress sensitivity cause the permeability form the permeability drop funnel, which is consistent with the shape of the pressure drop funnel. Under the constant bottom pressure, the propagation speed of the funnel will gradually decrease in both longitudinal and lateral direction. And the overall propagation speed rapidly increases first and then gradually decreases. In the scenario of steady decrease in the bottomhole pressure, the pressure drop speed shows an increasing trend in the longitudinal direction, and a decreasing trend in the lateral direction. The overall propagation speed of the pressure drop funnel increases all along. The reservoir pressure drop is positively correlated with the initial porosity, the initial permeability and the elastic modulus. For Poisson ratio, when the ratio is small, the reservoir pressure drop has a negative correlation. As Poisson ratio increases over 0.35, a positive correlation exists. It was found from the sensitivity analysis of reservoir pressure drop that petrophysical parameters have strong sensitivity to pressure drop, especially for permeability. Therefore, this work may provide insights into the CBM reservoir properties, and thus will be favorable for improving CBM recovery.

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“…To understand the mechanisms involved in the evolution of waves at the transition from smooth to wavy stratified flow regime, Lioumbas et al (2005) suggested that the transition from a smooth to a wavy interface can be related to the transition from laminar to turbulent flow inside the liquid layer. The paper of Teyssedou et al (2005) presents experimental counter-current air-water flow data on the onset of flooding and slugging, the slug propagation velocity, the predominant slug frequency and the average void fraction collected by using different size orifices installed at two locations in a horizontal pipe. Teyssedou et al (2005) observed that the mutual interaction of waves traveling in opposite directions seems to control the behavior of the slug propagation velocity, the slug frequency and average void fraction with the increase of gas superficial velocity.…”

mentioning

confidence: 99%

“…The paper of Teyssedou et al (2005) presents experimental counter-current air-water flow data on the onset of flooding and slugging, the slug propagation velocity, the predominant slug frequency and the average void fraction collected by using different size orifices installed at two locations in a horizontal pipe. Teyssedou et al (2005) observed that the mutual interaction of waves traveling in opposite directions seems to control the behavior of the slug propagation velocity, the slug frequency and average void fraction with the increase of gas superficial velocity. Guo et al, (2002) investigated the effect of gas and liquid flow rates, liquid viscosity and surface tension on the stability of the interface using a two-fluid model.…”

mentioning

confidence: 99%

Stability analysis of inclined stratified two-phase gas–liquid flow

Salhi

Si‐Ahmed

Legrand

et al. 2010

Nuclear Engineering and Design

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The present investigation involves the modeling of gas-liquid interface in a two-phase stratified flow through a horizontal or nearly-horizontal circular duct. The most complete and fundamental model used for these calculations is known as the one dimensional two-fluid model. It is the most accurate of the two phase models since it considers each phase independently and links both phases with six conservation equations. The mass and momentum balance equations are written in dimensionless form. The dimensionless mass and momentum balance equations are combined with the method of characteristics and an explicit method to simulate the flow. At first, the linear stability of the flow is investigated by disturbing the liquid flow with a small perturbation. An improved version of the one-dimensional two-fluid model for horizontal flows is developed as a set of non linear hyperbolic governing equations. The model accounts for the flow and geometrical conditions effects (such as liquid viscosity, surface tension). In addition, the slope effect of the pipe is analyzed. It is shown that, for positive values of the slope angle (upward inclination), the slug flow becomes more probable, whereas negative values of the later (downward inclination) induce a more stable stratified flow.

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Air–water counter-current slug flow data in vertical-to-horizontal pipes containing orifice type obstructions

Cited by 9 publications

References 15 publications

Countercurrent Flow Limitation in a Pipeline with an Orifice

Countercurrent Flow Limitation in a Pipeline with an Orifice

Propagation of pressure drop in coalbed methane reservoir during drainage stage

Stability analysis of inclined stratified two-phase gas–liquid flow

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