Evaluation of Droplets Deposition Coefficient and Entrainment Rate in Annular Two-phase Flow in Vertical Round Tube PDF Download
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Author: Yiak Mong Yeoh
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 134
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Book Description
Author: Yiak Mong Yeoh
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 134
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Book Description
Author: Chee Hwa Danny Yeo
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 186
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Book Description
![Entrainment and Deposition Rates of Droplets in Annular Two-phase Flow. [PWR ; BWR]. PDF](https://books.google.com/books/content/images/frontcover/jw9yAQAACAAJ?fife=w80-h100)
Author:
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ISBN:
Category :
Languages : en
Pages :
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Book Description
The droplet entrainment from a liquid film is important to the mass, momentum, and energy transfer processes in annular two-phase flow. For example, the amount of entrainment as well as the rate of entrainment significantly affect the occurrences of the dryout, whereas the post CHF heat transfer depends strongly on the entrainment and droplet sizes. Despite the importance of the entrainment rate, there have been no satisfactory correlations available in the literature. In view of these, correlations for entrainment rate covering both entrance region and equilibrium region have been developed from a simple model in collaboration with data. Results show that the entrainment rate varies considerably in the entrainment development region, however, at a certain distance from an inlet it attains an equilibrium value. A simple approximate correlation has been obtained for the equilibrium state where entrainment rate and deposition rate becomes equal. The result indicates that the equilibrium entrainment rate is proportional to Weber number based on the hydraulic diameter of a tube.
Author:
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Category :
Languages : en
Pages : 28
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Book Description
Two-fluid model predictions of film dryout in annular flow are limited by the uncertainties in the constitutive relations for the entrainment rate of droplets from the liquid film. The main cause of these uncertainties is the lack of separate effects experimental data in the range of the operating conditions in nuclear power reactors. Air/water and Freon-113 entrainment rate data have been obtained in 10 mm tubes using the film extraction technique. These experiments have been scaled to approach high pressure steam-water flow conditions. The effects of surface tension and density ratio, missing from most previous data sets, have been systematically tested. The entrainment rate mechanism is assumed to be a Kelvin-Helmholtz instability. Based on this analysis and two previous correlations, a new correlation is proposed that is valid for low viscosity fluids in small ducts in the ripple annular regime.
Author:
Publisher:
ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 528
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Book Description
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.
Author: Kim Ann Shollenberger
Publisher:
ISBN:
Category :
Languages : en
Pages : 292
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Book Description
Author: L S Tong
Publisher: Routledge
ISBN: 1351463365
Category : Science
Languages : en
Pages : 394
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Book Description
Completely updated, this graduate text describes the current state of boiling heat transfer and two-phase flow, in terms through which students can attain a consistent understanding. Prediction of real or potential boiling heat transfer behaviour, both in steady and transient states, is covered to aid engineering design of reliable and effective systems.
Author: Isao Kataoka
Publisher:
ISBN:
Category : Two-phase flow
Languages : en
Pages : 64
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Book Description
Author: L. B. Cousins
Publisher:
ISBN:
Category :
Languages : en
Pages : 36
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Book Description
