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Study of the Onset of Liquid Accumul...

Fan, Yilin.

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Study of the Onset of Liquid Accumulation and Pseudo-Slug Flow Characterization.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Study of the Onset of Liquid Accumulation and Pseudo-Slug Flow Characterization./
作者:	Fan, Yilin.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2017,
面頁冊數:	236 p.
附註:	Source: Dissertations Abstracts International, Volume: 79-01, Section: B.
Contained By:	Dissertations Abstracts International79-01B.
標題:	Engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10279537
ISBN:	9781369850437

Study of the Onset of Liquid Accumulation and Pseudo-Slug Flow Characterization.
Fan, Yilin.

Study of the Onset of Liquid Accumulation and Pseudo-Slug Flow Characterization. - Ann Arbor : ProQuest Dissertations & Theses, 2017 - 236 p.

Source: Dissertations Abstracts International, Volume: 79-01, Section: B.

Thesis (Ph.D.)--The University of Tulsa, 2017.

This item is not available from ProQuest Dissertations & Theses.

Accumulation of oil and/or water at the bottom of an upward inclined pipe is known to be the source of many industrial problems, such as corrosion and terrain slugging. Accurate prediction of the critical gas velocity, below which liquid accumulation can occur, is of great importance for production system design. An extensive literature review has shown that few experimental studies considered low liquid flow rates, which is crucial in many circumstances, for example, a wet gas pipeline with a large diameter. The first contribution of the current study is the experimental investigation of the onset of liquid accumulation at low liquid loading conditions. The experimental study was conducted in a 3-in low-pressure facility at low liquid loading conditions. Two pipe geometries, straight upward inclined pipe, and valley configuration, were employed in this work to investigate the pipe geometry effect on the flow behavior. Three liquid flow rates (0.001, 0.005 and 0.01 m/s) were investigated. Five inclination angles (2°, 5°, 10°, 15° and 20°) were studied for the straight pipe. The inclination angle of the valley configuration varied from -20° to 20° (±2°, ±5°, ±10°, ±15° and ±20°). Tulsa city municipal water and compressed air were used as the test fluids. Pressure drop, liquid holdup, wave and pseudo-slug characteristics data were acquired. The onset of film reversal was identified as the main mechanism for liquid accumulation and the initiation of intermittent flow. Based on the liquid film reversal theory, a new mechanics model of critical gas velocity for stratified flow is proposed in this study. The new model was verified with the current experiments and evaluated with the other available data. The total absolute error is 9.3%. This study also reviewed and evaluated other prediction models for critical gas velocity. The new model performs better than the others, especially in capturing the effect of inclination angle and liquid flow rate. Below the onset of liquid accumulation (vSg < vSgc), a coherent flow structure has been observed. This structure has been classified as pseudo-slug flow, the nature of which is not well understood due to its complexity. Although pseudo-slug flow shows similar intermittent behavior to slug flow, its characteristics differ from those of slug flow. Wire-mesh sensors, which provide the instantaneous phase distribution across the pipe cross-section, were employed in this experimental study to quantify the pseudo-slug flow characteristics. These parameters include liquid holdup in the pseudo-slug body and liquid film region, pseudo-slug frequency, translational velocity, average body length, as well as wave celerity at the interface in the film region. Pseudo-slug flow spatial evolution was also studied by investigating the change of its characteristics along the uphill test section. Two major differences were observed in the uphill section: one near inlet due to the development of the pseudo-slug, while the other near the end of the pipe because of the outlet effect.

ISBN: 9781369850437Subjects--Topical Terms:

586835
Engineering.
Subjects--Index Terms:

Inclined pipe flow

Study of the Onset of Liquid Accumulation and Pseudo-Slug Flow Characterization.
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500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Pereyra, Eduardo.
502 $a Thesis (Ph.D.)--The University of Tulsa, 2017.
506 $a This item is not available from ProQuest Dissertations & Theses.
506 $a This item must not be added to any third party search indexes.
506 $a This item must not be sold to any third party vendors.
520 $a Accumulation of oil and/or water at the bottom of an upward inclined pipe is known to be the source of many industrial problems, such as corrosion and terrain slugging. Accurate prediction of the critical gas velocity, below which liquid accumulation can occur, is of great importance for production system design. An extensive literature review has shown that few experimental studies considered low liquid flow rates, which is crucial in many circumstances, for example, a wet gas pipeline with a large diameter. The first contribution of the current study is the experimental investigation of the onset of liquid accumulation at low liquid loading conditions. The experimental study was conducted in a 3-in low-pressure facility at low liquid loading conditions. Two pipe geometries, straight upward inclined pipe, and valley configuration, were employed in this work to investigate the pipe geometry effect on the flow behavior. Three liquid flow rates (0.001, 0.005 and 0.01 m/s) were investigated. Five inclination angles (2°, 5°, 10°, 15° and 20°) were studied for the straight pipe. The inclination angle of the valley configuration varied from -20° to 20° (±2°, ±5°, ±10°, ±15° and ±20°). Tulsa city municipal water and compressed air were used as the test fluids. Pressure drop, liquid holdup, wave and pseudo-slug characteristics data were acquired. The onset of film reversal was identified as the main mechanism for liquid accumulation and the initiation of intermittent flow. Based on the liquid film reversal theory, a new mechanics model of critical gas velocity for stratified flow is proposed in this study. The new model was verified with the current experiments and evaluated with the other available data. The total absolute error is 9.3%. This study also reviewed and evaluated other prediction models for critical gas velocity. The new model performs better than the others, especially in capturing the effect of inclination angle and liquid flow rate. Below the onset of liquid accumulation (vSg < vSgc), a coherent flow structure has been observed. This structure has been classified as pseudo-slug flow, the nature of which is not well understood due to its complexity. Although pseudo-slug flow shows similar intermittent behavior to slug flow, its characteristics differ from those of slug flow. Wire-mesh sensors, which provide the instantaneous phase distribution across the pipe cross-section, were employed in this experimental study to quantify the pseudo-slug flow characteristics. These parameters include liquid holdup in the pseudo-slug body and liquid film region, pseudo-slug frequency, translational velocity, average body length, as well as wave celerity at the interface in the film region. Pseudo-slug flow spatial evolution was also studied by investigating the change of its characteristics along the uphill test section. Two major differences were observed in the uphill section: one near inlet due to the development of the pseudo-slug, while the other near the end of the pipe because of the outlet effect.
590 $a School code: 0236.
650 4 $a Engineering. $3 586835
650 4 $a Petroleum engineering. $3 566616
653 $a Inclined pipe flow
653 $a Liquid loading
653 $a Pseudo-slug flow
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690 $a 0765
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