Annular Flow Entrainment Rate Experiment in a Vertical Pipe PDF Download
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Author:
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ISBN:
Category :
Languages : en
Pages : 19
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Book Description
An air-water experiment has been performed to measure the entrainment rate in a small pipe. The current data extend the available database in the literature to higher gas and liquid flows and also to higher pressures. The ranges covered are 8.1 × 102 kg/m2s> (gas flux rate)> 4.5 × 104 kg/m2s, 5.5 kg/m2s> (liquid flux rate)> 2.9 × 102s and 140 CPU> PP> 660 CPU. The test section has an internal diameter of 9.5 mm and an L/D ratio of 440. The measurements were made by extracting the liquid film at two locations establishing fully developed annular flow. The data were validated by visual observation and comparisons with the data of Cousins and Hewitt. A mechanism for the entrainment rate in terms of Taylors̀ ripple instability is proposed. The theory is modified to include the effect of the inertia of the droplets in the gas stream. The model results in a dimensionless group that includes the Weber number based on the droplet concentration and the liquid film Reynolds number. Kataoka and Ishiis̀ correlation (1982) is modified in light of this model and the new correlation scales the present data and Cousins and Hewitts̀ data very well. 19 refs., 8 figs., 3 tabs.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 19
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Book Description
An air-water experiment has been performed to measure the entrainment rate in a small pipe. The current data extend the available database in the literature to higher gas and liquid flows and also to higher pressures. The ranges covered are 8.1 × 102 kg/m2s> (gas flux rate)> 4.5 × 104 kg/m2s, 5.5 kg/m2s> (liquid flux rate)> 2.9 × 102s and 140 CPU> PP> 660 CPU. The test section has an internal diameter of 9.5 mm and an L/D ratio of 440. The measurements were made by extracting the liquid film at two locations establishing fully developed annular flow. The data were validated by visual observation and comparisons with the data of Cousins and Hewitt. A mechanism for the entrainment rate in terms of Taylors̀ ripple instability is proposed. The theory is modified to include the effect of the inertia of the droplets in the gas stream. The model results in a dimensionless group that includes the Weber number based on the droplet concentration and the liquid film Reynolds number. Kataoka and Ishiis̀ correlation (1982) is modified in light of this model and the new correlation scales the present data and Cousins and Hewitts̀ data very well. 19 refs., 8 figs., 3 tabs.
Author: Stephen Jarvis
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 114
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Author: Kim Ann Shollenberger
Publisher:
ISBN:
Category :
Languages : en
Pages : 292
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Author: Geoffrey Hewitt
Publisher: Elsevier
ISBN: 1483285235
Category : Technology & Engineering
Languages : en
Pages : 327
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Book Description
Annular Two-Phase Flow presents the wide range of industrial applications of annular two-phase flow regimes. This book discusses the fluid dynamics and heat transfer aspects of the flow pattern. Organized into 12 chapters, this book begins with an overview of the classification of the various types of interface distribution observed in practice. This text then examines the various regimes of two-phase flow with emphasis on the regions of occurrence of the annular flow regime. Other chapters consider the single momentum and energy balances, which illustrate the differences and analogies between single- and two-phase flows. This book discusses as well the simple modes for annular flow with consideration to the calculation of the profile of shear stress in the liquid film. The final chapter deals with the techniques that are developed for the measurement of flow pattern, entrainment, and film thickness. This book is a valuable resource for chemical engineers.
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Category : Liquid films
Languages : en
Pages :
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Author:
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ISBN:
Category :
Languages : en
Pages :
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Author:
Publisher:
ISBN:
Category : Boiling water reactors
Languages : en
Pages : 100
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Author:
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ISBN:
Category :
Languages : en
Pages : 10
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New experimental data was obtained for pressure drop and entrainment for annular up-flow in a vertical pipe. The 9.5 mm. pipe has an L/D ratio of 440 to insure fully developed annular flow. The pressure ranged from 140 kPa to 660 kPa. Therefore the density ratio was varied by a factor of four approximately. This allows the investigation of the effect of pressure on the interfacial shear models. Gas superficial velocities between 25 and 126 m/s were tested. This extends the range of previous data to higher gas velocities. The data were compared with well known models for interfacial shear that represent the state of the art. Good results were obtained when the model by Asali, Hanratty and Andreussi was modified for the effect of pressure. Furthermore an equivalent model was obtained based on the mixing length theory for rough pipes. It correlates the equivalent roughness to the film thickness.
Author:
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ISBN:
Category :
Languages : en
Pages :
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Author: S. Levy
Publisher:
ISBN:
Category : Boiling water reactors
Languages : en
Pages : 44
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Book Description
