Two-phase minor loss in horizontal bubbly flow with elbows: 45° and 90° elbows

Kim, Seung-Jin; Kojasoy, Gunol; Guo, Tangwen

doi:10.1016/j.nucengdes.2008.08.019

Cited by 32 publications

(9 citation statements)

References 7 publications

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“…Correlation (7) fits our experimental data with E = 15% and the data of Spedding and Benard [45] and Kim et al [46] with E = 32%. The frictional pressure-drop data for vertical upward churn and annular flows are correlated as follows:…”

Section: Analysis Of Pressure Drop 321 Pressure Drop Along the Strsupporting

confidence: 80%

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Water–air flow in straight pipes and across 90∘ sharp-angled mitre elbows

Al-Tameemi

Riccó

2019

International Journal of Multiphase Flow

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Section: Analysis Of Pressure Drop 321 Pressure Drop Along the Strsupporting

confidence: 80%

“…In Fig. 20 the two-phase C L data for the horizontal straight pipe upstream of the elbow in the present work and the data of Spedding and Benard [45] and Kim et al [46] show excellent collapse when C L Re α…”

Section: Analysis Of Pressure Drop 321 Pressure Drop Along the Strsupporting

confidence: 65%

Water–air flow in straight pipes and across 90∘ sharp-angled mitre elbows

Al-Tameemi

Riccó

2019

International Journal of Multiphase Flow

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“…More recently, several studies have investigated the effect of elbow restrictions on horizontal bubbly flow (Kim et al, 2007;Talley et al, 2009;Kim et al, 2010;Yadav et al, 2010). In these studies, a double-sensor conductivity probe was employed to acquire local data in a 5.03 cm ID test section with a total development length of over 20 meters.…”

Section: Introductionmentioning

confidence: 99%

Characterization of horizontal air–water two-phase flow in a round pipe part II: Measurement of local two-phase parameters in bubbly flow

Talley

Worosz

Kim

2015

International Journal of Multiphase Flow

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The current work seeks to develop an additional database in air-water horizontal bubbly flow through a 3.81 cm inner diameter test section with a total development length of approximately 250 diameters. The experimental conditions are chosen to cover a wide range of the bubbly flow regime based upon flow visualization using a high-speed video camera. A database of local time-averaged void fraction, bubble velocity, interfacial area concentration, and bubble Sauter mean diameter are acquired throughout the entire pipe cross-section using a foursensor conductivity probe for nine flow conditions. To investigate the evolution of the flow, measurements are made at axial locations of 44, 116, and 244 diameters downstream of the inlet.Using this database, the effects of gas flow rate, liquid flow rate, and development length on the local and area-averaged two-phase flow parameters are presented. From the local profiles, it is found that highly turbulent liquid flow conditions cause the void fraction profile to become more uniform with increasing development length through a turbulent mixing process which counters the effect of buoyancy. Bubble interactions are also observed to play a significant role in the evolution of the flow such that the area-averaged void fraction and interfacial area concentration can have different axial trends.

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“…Fossa and Guglielmini (2002) studied pressuredrop and void fraction across thin and thick orifices. Alimonti et al (2010) investigated the characteristics of two-phase flows through a "Willis-type" multiple orifice valve (MOV), while Azzi and Friedel (2005), Chen et al (2006) and Kim et al (2010) evaluated the use of 90 • elbows as primary elements to estimate the total mass flow-rates. Additionally, Xing et al (2013) performed a study comprising wavy pipe sections to mitigate slug flow regimes.…”

Section: Introductionmentioning

confidence: 99%

The hydrodynamics of two-phase flows in the injection part of a conventional ejector

Mifsud

Cao

Verdin

et al. 2019

International Journal of Multiphase Flow

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The characteristics of two-phase flow through a 'conventional' convergent-nozzle in an entrainment chamber of an ejector apparatus are described in this paper. A unique data set comprising 350 data points was generated in an air-water horizontal test-rig. Two sets of flow conditions were established, the first one including high liquid-low gas fluids with void fractions less than 0.55, and the second one involving high gas-low liquid fluids with void fractions greater than 0.75. All considered flow-rates lied within the sub-critical flow region. Two-phase flow pressure drop multiplier based empirical correlations were developed to estimate the total mass flow-rates. In the high liquid region, Morris (1985) correlation was modified, resulting in less than 10 % error. In the high gas region, two new correlations were proposed, showing less than 10 % and 15 % of errors, respectively. The established empirical correlations were related to other available multipliers for different geometric configurations including a Venturi, an orifice plate, a gate valve, and a globe valve and were compared to 20 other void fraction correlations. The Chisholm (1983) and Huq and Loth (1992) correlations showed the highest similarities to the ones proposed for the high liquid and high gas regions, respectively.

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Two-phase minor loss in horizontal bubbly flow with elbows: 45° and 90° elbows

Cited by 32 publications

References 7 publications

Water–air flow in straight pipes and across 90∘ sharp-angled mitre elbows

Water–air flow in straight pipes and across 90∘ sharp-angled mitre elbows

Characterization of horizontal air–water two-phase flow in a round pipe part II: Measurement of local two-phase parameters in bubbly flow

The hydrodynamics of two-phase flows in the injection part of a conventional ejector

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