Comparison of Two-phase Flow Characteristics of Valves and Orifices in a Large Diameter Horizontal Pipeline PDF Download
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Author: Mohamed. S. M. Elmnefi
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: Mohamed. S. M. Elmnefi
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: Abdunaser Ali Saadawi
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Category :
Languages : en
Pages : 0
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Author: Saleh M. Mahmoud
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Category :
Languages : en
Pages : 0
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Author: Salah Ali A. Masheiti
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Category :
Languages : en
Pages : 0
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Author: Tarig Ali Al-Bkoush
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Category :
Languages : en
Pages : 0
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Author: Essaied Masoud Ali
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Category :
Languages : en
Pages : 0
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This study investigates the behaviour of two-phase flow in large diameter horizontal pipelines. The study was divided into two main parts: (i) General two-phase flow in 203 mm diameter pipeline, where the pressure drop and void fraction were measured. The pressure drop was measured using 23 bottom tapping points along a 34 m test section. The results were compared with six well known pressure drop models; these models did not allow for diameter size effect, it was therefore not surprising that good agreement was not achieved. A traversing y-ray apparatusw as designed and constructed for the measurements of void fraction. Void fraction measurements were compared with geometrical void fraction calculation, and very satisfactory agreements were obtained. The apparatus was also tested under a different number of chordal positions (steps) to determine the influence of the number of steps on the accuracy of the results. The void fraction results were compared with nine correlations found in the literature; the effect of pipe size was clear. A flow pattern map was also drawn for a 203 mm pipeline, which covered all the possible flow patterns (annular flow could not be obtained in this size of pipe, with the available air supply), and compared with three well known flow pattern maps, where a little agreement was found. (ii) The measurement of interfacial level gradient in the smooth stratified flow conditions. Two depth gauges (probes) were designed, constructed and calibrated for the measurement of the water level change along the test section. The two probes were placed 12 metres apart in the test section, where the flow conditions considered settled. The measurement accuracy of the probes was within 1 mm of liquid height, i. e. less than 1%. Two theoretical models in the field of stratified flow were tested and then modified to improve their ability to predict the present data, and perhaps 11 other data obtained from large diameter pipelines. A model based on the present set of data, following Bishop et. al (1986) approach was proposed, which predicts the present data within RMS of 8%.
Author: Afshin J. Ghajar
Publisher: Springer Nature
ISBN: 3030416267
Category : Science
Languages : en
Pages : 136
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This book provides design engineers using gas-liquid two-phase flow in different industrial applications the necessary fundamental understanding of the two-phase flow variables. Two-phase flow literature reports a plethora of correlations for determination of flow patterns, void fraction, two- phase pressure drop and non-boiling heat transfer correlations. However, the validity of a majority of these correlations is restricted over a narrow range of two -phase flow conditions. Consequently, it is quite a challenging task for the end user to select an appropriate correlation/model for the type of two-phase flow under consideration. Selection of a correct correlation also requires some fundamental understanding of the two-phase flow physics and the underlying principles/assumptions/limitations associated with these correlations. Thus, it is of significant interest for a design engineer to have knowledge of the flow patterns and their transitions and their influence on two-phase flow variables. To address some of these issues and facilitate selection of appropriate two-phase flow models, this volume presents a succinct review of the flow patterns, void fraction, pressure drop and non-boiling heat transfer phenomenon and recommend some of the well scrutinized modeling techniques.
Author: Duncan Chisholm
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 328
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Author: Khalil Enjad Jandel Al-Jumaily
Publisher:
ISBN:
Category : Pipelines
Languages : en
Pages : 1188
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Author:
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Category : Aeronautics
Languages : en
Pages : 1492
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