Prediction in stratified gas-liquid co-current flow in horizontal pipelines

Spedding, P.L.; Hand, N.P.

doi:10.1016/s0017-9310(96)00252-9

Cited by 64 publications

(35 citation statements)

References 12 publications

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“…On figure 12, the extremity effect (difference between the experimental curves) plays an important role, which can also indicate that two-phase flow was not uniform along the 1.3 m long sector. Results presented by Spedding and Hand 9 show that for low vapour velocities, the flow may remain non uniform over a length of several tens of diameter. To solve this problem and check parameters one by one, we intend to build a new linear 40 mm I.D.…”

Section: The Horizontal 20 MM Id Tubementioning

confidence: 97%

Latest Developments on He II Co-Current Two-Phase Flow Studies

Rousset

Gauthier

Grimaud

et al. 1998

Advances in Cryogenic Engineering

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Large scale experiments were performed at CEA Grenoble with the support of CERN to simulate and understand the HeII cooling circuit of the LHC. This paper describes the latest results obtained in HeII co-current two-phase flow configuration. First we summarize thermal and hydraulic behaviour of flows obtained in a 40 mm I.D., 86 m long tube inclined at 1.4% which resembles closely the LHC heat exchanger tube. For low vapour velocities, the flow pattern is found to be stratified. A model based on this observation has been developed which fits very well the measured pressure losses. However the wetted surface predicted by the model underestimates the measured one, notably for high vapour velocities. In that case, liquid droplets entrainment takes place. Droplets landing on the tube wall increase the wetted surface. Thus we infer that for higher vapour velocities, the stratified two-phase flow model should not be applied anymore. In order to validate the range of availability of the model, and begin to draw a flow pattern map, a 20 mm I.D. horizontal test sector was built and experiments were performed. First results are presented here, including the observation of the stratified-annular flow transition. ABSTRACTLarge scale experiments were performed at CEA Grenoble with the support of CERN to simulate and understand the HeII cooling circuit of the LHC. This paper describes the latest results obtained in HeII co-current two-phase flow configuration. First we summarize thermal and hydraulic behaviour of flows obtained in a 40 mm I.D., 86 m long tube inclined at 1.4% which resembles closely the LHC heat exchanger tube. For low vapour velocities, the flow pattern is found to be stratified. A model based on this observation has been developed which fits very well the measured pressure losses. However the wetted surface predicted by the model underestimates the measured one, notably for high vapour velocities. In that case, liquid droplets entrainment takes place. Droplets landing on the tube wall increase the wetted surface. Thus we infer that for higher vapour velocities, the stratified two-phase flow model should not be applied anymore. In order to validate the range of availability of the model, and begin to draw a flow pattern map, a 20 mm I.D. horizontal test sector was built and experiments were performed. First results are presented here, including the observation of the stratified-annular flow transition.

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Section: The Horizontal 20 MM Id Tubementioning

confidence: 97%

Latest Developments on He II Co-Current Two-Phase Flow Studies

Rousset

Gauthier

Grimaud

et al. 1998

Advances in Cryogenic Engineering

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“…The correlation of Andreussi & Persen (1987) is widely used as well as several modifications, which have been proposed in literature (Calgaro, 2012;Khaledi et al, 2014). The expression of Spedding & Hand (1997), although not much used, also deserved to be highlighted.…”

Section: Gas-liquid Horizontal Stratified Flowsmentioning

confidence: 99%

“…Andreussi & Persen (1987) use a critical Froude number to monitor the surging of interfacial waves and Andritsos & Hanratty (1987b) and Spedding & Hand (1997) By revisiting the derivation of the 1D Two-Fluid Model and considering that the interface is wavy according to a known function, Liné & Lopez (1997) managed to separate in two terms the interfacial shear stress for a smooth interface and the one solely due to the presence of the interfacial waves. However, Liné & Lopez (1997) did not manage to find an expression for the interfacial shear stress due to the waves that depends only on local parameters of the flow, as it is the ideal for the 1D Two-Fluid Model.…”

Section: Gas-liquid Horizontal Stratified Flowsmentioning

confidence: 99%

“…However, such non-standard measurements are not available In the previously mentioned framework, the gas phase momentum balance is the one most used in literature for calculating the experimental interfacial friction factor (Andritsos & Hanratty, 1987b;Spedding & Hand, 1997;Newton & Behnia, 1998). The presence of the gas wall shear stress poses a problem, because experimental values for it are not always available, as in Newton & Behnia (1998).…”

Section: The "Experimental" Interfacial Friction Factormentioning

confidence: 99%

“…When such issue is present, a correlation is used for the gas friction factor and the gas wall shear stress is then computed (Andritsos & Hanratty, 1987b;Spedding & Hand, 1997). …”

Section: The "Experimental" Interfacial Friction Factormentioning

confidence: 99%

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PASQUALETTE¹

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Marcelo de Alencastro PasqualetteThe author graduated in Mechanical Engineering from the Federal University of Rio de Janeiro in 2015 with the cum laude honor. In the former, the author received a PIBIC-CNPq scholarship for two years and an ANP PRH-37 scholarship for other two years. He has been working at the SINTEF Institute of Brazil for four years in the areas of multiphase flow, thermodynamics and flow assurance. He has eight complete papers published at conferences and two peer-reviewed articles published at journals.

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