Pressure drop and void fraction profiles during horizontal flow through thin and thick orifices

Fossa, Marco; Guglielmini, G.

doi:10.1016/s0894-1777(02)00156-5

Cited by 89 publications

(40 citation statements)

References 8 publications

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“…Flow in the developing region and the developing length (downstream contraction) is also dependent on the upstream flow pattern and area ratio. Fossa and Guglielmini (2002) noted that this behaviour has been observed irrespective of the orifice thickness for higher values of liquid flow rate and even more evident when the area ratio is low.…”

Section: Introductionmentioning

confidence: 87%

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Persistence of frequency in gas–liquid flows across a change in pipe diameter or orientation

Azzopardi

Ijioma

Yang

et al. 2014

International Journal of Multiphase Flow

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From a study of the characteristics of structures across a 67/38 mm sudden contraction, using air/silicone oil flows, it has been found that frequencies of the structures (mainly slugs) persist across the contraction. This is in contrast to the velocities and lengths which increase as they move in to the smaller diameter pipe. These observations were found for both vertical and 5° upward orientations. A similar persistence of frequency has been found from four other sources in the literature: a vertical (gradual) contraction; a horizontal Venturi; and two cases of horizontal pipe, 90° bend and vertical riser combination. The latter were at two contrasting conditions: (i) at atmospheric pressure with air/water in small diameter (34 mm) pipes; (ii) at 20 bar in larger diameter pipes (189 mm) using nitrogen and naphtha.2

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Section: Introductionmentioning

confidence: 87%

“…Correlations based on the two-phase singular pressure drop multiplier have been proposed by, e.g., Attou andBolle (1997) andGuglielmini (2002). These are functions of inlet void fraction of the dimensions of the fitting.…”

Section: Introductionmentioning

confidence: 99%

Persistence of frequency in gas–liquid flows across a change in pipe diameter or orientation

Azzopardi

Ijioma

Yang

et al. 2014

International Journal of Multiphase Flow

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“…For their study, they used the same experimental conditions (flow conditions, orifice geometries) as those employed by of Fossa and Guglielmini (2002). They report finding similar to those of Fossa and Guglielmini.…”

Section: Introductionmentioning

confidence: 77%

“…The flow in the developing region and the developing length (downstream the contraction) is also dependent on the upstream flow patterns and area ratio. Fossa and Guglielmini (2002) noticed that this behaviour was observed irrespective of the orifice thickness for high liquid flow rate and even more evident when the area ratio is low.…”

Section: Introductionmentioning

confidence: 89%

Interrogating the effect of an orifice on the upward two-phase gas–liquid flow behavior

Zeghloul

Aberqi

Saidj

et al. 2015

International Journal of Multiphase Flow

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“…Liu [12] and Zhou [13] and Zhang [14] proved that the incipient cavitation number of sudden flow reduction and sudden flow enlargement decreased with the increase in the contraction ratio. As stated above, the research conducted in the past focused mainly on the relationship between the contraction ratio and energy loss or incipient cavitation number [15][16][17][18]. But in actual engineering, the most practical thing is to supply the concrete expressions of plug energy loss and plug minimum wall pressure coefficients.…”

Section: Introductionmentioning

confidence: 99%

Research on Energy Dissipation in a Discharge Tunnel with a Plug Energy Dissipater

Liu

2016

T FAMENA

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SummaryPlug energy dissipater, as a kind of effective energy dissipater with economic characteristics, has become very popular. The energy loss coefficient and the minimum wall pressure coefficient of the plug are two important factors in the plug energy dissipater design. In this paper, the two coefficients and relative parameters, such as the contraction ratio of the plug diameter to the flood discharge tunnel diameter, the ratio of the plug thickness to the tunnel diameter, and the Reynolds number of the flow through the plug, were analysed by theoretical considerations, and their relationship expressions were obtained by numerical simulations and were verified by experimental data. It could be concluded that the two coefficients were mainly dominated by the contraction ratio of the plug. The lower contraction ratio of the plug is, the larger are the two coefficients. The research results demonstrate that effects of the Reynolds number on the two coefficients can be neglected when this number is greater than 10 5 ; the relative thickness of the plug has little impact on them and can be neglected.

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Pressure drop and void fraction profiles during horizontal flow through thin and thick orifices

Cited by 89 publications

References 8 publications

Persistence of frequency in gas–liquid flows across a change in pipe diameter or orientation

Persistence of frequency in gas–liquid flows across a change in pipe diameter or orientation

Interrogating the effect of an orifice on the upward two-phase gas–liquid flow behavior

Research on Energy Dissipation in a Discharge Tunnel with a Plug Energy Dissipater

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