Surface wettability and flow properties of non-metallic pipes in laminar flow

doi:10.1016/j.cjche.2019.11.005

中国化学工程学报 ›› 2020, Vol. 28 ›› Issue (3): 636-642.DOI: 10.1016/j.cjche.2019.11.005

• Fluid Dynamics and Transport Phenomena • 上一篇下一篇

Surface wettability and flow properties of non-metallic pipes in laminar flow

Hongyuan Qi^1,2, Aiguo Liang³, Huayi Jiang^1,2, Jianying Shi⁴, Nana Sun^1,2, Yulong Wang^1,2

1 College of Petroleum Engineering, Xi'an Shiyou University, Xi'an 710065, China;
2 Shaanxi Key Laboratory of Advanced Stimulation Technology for Oil & Gas Reservoirs, Xi'an Shiyou University, Xi'an 710065, China;
3 Karamay Hongshan Oilfield Co. Ltd., Karamay 834000, China;
4 No.1 Production Plant, Xinjiang Oilfield Branch Company, Karamay 834000, China

收稿日期:2019-01-07 修回日期:2019-10-01 出版日期:2020-03-28 发布日期:2020-06-11
通讯作者: Hongyuan Qi
基金资助:
This work was supported by Shaanxi Provincial Natural Science Foundation, China (No. 2019JQ-819).

Surface wettability and flow properties of non-metallic pipes in laminar flow

Hongyuan Qi^1,2, Aiguo Liang³, Huayi Jiang^1,2, Jianying Shi⁴, Nana Sun^1,2, Yulong Wang^1,2

1 College of Petroleum Engineering, Xi'an Shiyou University, Xi'an 710065, China;
2 Shaanxi Key Laboratory of Advanced Stimulation Technology for Oil & Gas Reservoirs, Xi'an Shiyou University, Xi'an 710065, China;
3 Karamay Hongshan Oilfield Co. Ltd., Karamay 834000, China;
4 No.1 Production Plant, Xinjiang Oilfield Branch Company, Karamay 834000, China

Received:2019-01-07 Revised:2019-10-01 Online:2020-03-28 Published:2020-06-11
Contact: Hongyuan Qi
Supported by:
This work was supported by Shaanxi Provincial Natural Science Foundation, China (No. 2019JQ-819).

摘要/Abstract

摘要： In this paper, three liquids flowing in five pipes with the same inner diameter of 14 mm were studied to determine the relationship between the surface wettability and flow properties in laminar flow (Re < 2000). This was motivated by oilfield observations of increased pressure drops in non-metallic pipes compared to those in metal pipes, which was contrary to expectations. A new expression for the frictional coefficient that considers the Reynolds number and contact angle θ in laminar flow for non-metallic pipes was proposed based on the experimental results of single-phase flow using dimension and regression analyses. The solutions of the anomalous phenomenon were proposed from the perspectives of the pipe diameter, contact-angle difference, and the compatibility between flexible composite pipe and JLHW105 oil according to the new formula. The surprising finding was that the surface wettability could control the frictional resistance by the critical contact angle (39.9°) obtained at the same Reynolds number. If 0° < θ ≤ 39.9°, the frictional coefficient increased as the contact angle increased. In contrast, if 39.9° < θ < 180°, the frictional coefficient decreased with increasing contact angle. The influences of the pipe diameter and contactangle difference on the pressure drop difference of JLHW105 oil showed an inversely proportional relation. A series of materials and liquids were tested. The selection of pipe material for transporting a given fluid can be based on the contact angle, surface tension, and critical limit of the contact angle obtained. The research results are expected to provide some guidelines for the selection of the appropriate pipe material for a given set of fluids.

关键词: Wettability, Contact angle, Frictional coefficient, Fluid mechanics, Laminar flow, Petroleum

Abstract: In this paper, three liquids flowing in five pipes with the same inner diameter of 14 mm were studied to determine the relationship between the surface wettability and flow properties in laminar flow (Re < 2000). This was motivated by oilfield observations of increased pressure drops in non-metallic pipes compared to those in metal pipes, which was contrary to expectations. A new expression for the frictional coefficient that considers the Reynolds number and contact angle θ in laminar flow for non-metallic pipes was proposed based on the experimental results of single-phase flow using dimension and regression analyses. The solutions of the anomalous phenomenon were proposed from the perspectives of the pipe diameter, contact-angle difference, and the compatibility between flexible composite pipe and JLHW105 oil according to the new formula. The surprising finding was that the surface wettability could control the frictional resistance by the critical contact angle (39.9°) obtained at the same Reynolds number. If 0° < θ ≤ 39.9°, the frictional coefficient increased as the contact angle increased. In contrast, if 39.9° < θ < 180°, the frictional coefficient decreased with increasing contact angle. The influences of the pipe diameter and contactangle difference on the pressure drop difference of JLHW105 oil showed an inversely proportional relation. A series of materials and liquids were tested. The selection of pipe material for transporting a given fluid can be based on the contact angle, surface tension, and critical limit of the contact angle obtained. The research results are expected to provide some guidelines for the selection of the appropriate pipe material for a given set of fluids.

Key words: Wettability, Contact angle, Frictional coefficient, Fluid mechanics, Laminar flow, Petroleum

Hongyuan Qi, Aiguo Liang, Huayi Jiang, Jianying Shi, Nana Sun, Yulong Wang. Surface wettability and flow properties of non-metallic pipes in laminar flow[J]. 中国化学工程学报, 2020, 28(3): 636-642.

Hongyuan Qi, Aiguo Liang, Huayi Jiang, Jianying Shi, Nana Sun, Yulong Wang. Surface wettability and flow properties of non-metallic pipes in laminar flow[J]. Chinese Journal of Chemical Engineering, 2020, 28(3): 636-642.

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Surface wettability and flow properties of non-metallic pipes in laminar flow

Surface wettability and flow properties of non-metallic pipes in laminar flow

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