Water slip flow in superhydrophobic microtubes within laminar flow region

doi:10.1016/j.cjche.2014.12.010

Chinese Journal of Chemical Engineering ›› 2015, Vol. 23 ›› Issue (5): 763-768.DOI: 10.1016/j.cjche.2014.12.010

Water slip flow in superhydrophobic microtubes within laminar flow region

Zhijia Yu, Xinghua Liu, Guozhu Kuang

Department of Chemical Engineering, Dalian University of Technology, Dalian 116024, China

收稿日期:2014-04-01 修回日期:2014-12-03 出版日期:2015-05-28 发布日期:2015-06-26
通讯作者: Zhijia Yu
基金资助:
Supported by the National Natural Science Foundation of China (20476014, 51376030).

Water slip flow in superhydrophobic microtubes within laminar flow region

Zhijia Yu, Xinghua Liu, Guozhu Kuang

Department of Chemical Engineering, Dalian University of Technology, Dalian 116024, China

Received:2014-04-01 Revised:2014-12-03 Online:2015-05-28 Published:2015-06-26
Contact: Zhijia Yu
Supported by:
Supported by the National Natural Science Foundation of China (20476014, 51376030).

摘要/Abstract

摘要： The fabrication of superhydrophobic surfaces and the studies on water flow characteristics therein are of great significance to many industrial areas as well as to science and technology development. Experiments were carried out to investigate slip characteristics of water flowing in circular superhydrophobic microtubes within laminar flow region. The superhydrophobic microtubes of stainless steel were fabricated with chemical etching-fluorination treatment. An experimental setup was designed to measure the pressure drop as function of water flow rate. For comparison, superhydrophilic tubes were also tested. Poiseuille number Po was found to be smaller for the superhydrophobic microtubes than that for superhydrophilic ones. The pressure drop reduction ranges from 8% to 31%. It decreases with increasing Reynolds numberwhen Re <900, owing to the transition from Cassie state to Wenzel state. However, it is almost unchanged with further increasing Re after Re >900. The slip length in superhydrophobic microtubes also exhibits a Reynolds number dependence similarly to the pressure drop reduction. The relation between slip length and Darcy friction factor is theoretically analyzed with consideration of surface roughness effect, which was testified with the experimental results.

关键词: Slip flow, Superhydrophobic, Microtube, Pressure drop, Slip length, Darcy friction factor

Abstract: The fabrication of superhydrophobic surfaces and the studies on water flow characteristics therein are of great significance to many industrial areas as well as to science and technology development. Experiments were carried out to investigate slip characteristics of water flowing in circular superhydrophobic microtubes within laminar flow region. The superhydrophobic microtubes of stainless steel were fabricated with chemical etching-fluorination treatment. An experimental setup was designed to measure the pressure drop as function of water flow rate. For comparison, superhydrophilic tubes were also tested. Poiseuille number Po was found to be smaller for the superhydrophobic microtubes than that for superhydrophilic ones. The pressure drop reduction ranges from 8% to 31%. It decreases with increasing Reynolds numberwhen Re <900, owing to the transition from Cassie state to Wenzel state. However, it is almost unchanged with further increasing Re after Re >900. The slip length in superhydrophobic microtubes also exhibits a Reynolds number dependence similarly to the pressure drop reduction. The relation between slip length and Darcy friction factor is theoretically analyzed with consideration of surface roughness effect, which was testified with the experimental results.

Key words: Slip flow, Superhydrophobic, Microtube, Pressure drop, Slip length, Darcy friction factor

Zhijia Yu, Xinghua Liu, Guozhu Kuang. Water slip flow in superhydrophobic microtubes within laminar flow region[J]. Chinese Journal of Chemical Engineering, 2015, 23(5): 763-768.

Zhijia Yu, Xinghua Liu, Guozhu Kuang. Water slip flow in superhydrophobic microtubes within laminar flow region[J]. Chin.J.Chem.Eng., 2015, 23(5): 763-768.

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Water slip flow in superhydrophobic microtubes within laminar flow region

Water slip flow in superhydrophobic microtubes within laminar flow region

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