Conformally Anodizing Hierarchical Structure in a Deformed Tube towards Energy-saving Liquid Transportation

Li, Wei, Zhou, Honghao, Zhao, Kaiqi, Jin, Jian, Chen, Sherry, Shahzad, Muhammad Wakil, Jiang, Yinzhu, Matar, Omar K., Dai, Sheng, Xu, Bin and Sun, Lidong (2021) Conformally Anodizing Hierarchical Structure in a Deformed Tube towards Energy-saving Liquid Transportation. Chemical Engineering Journal. ISSN 1385-8947 (In Press)

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The creation of drag-reducing surfaces in deformed tubes is of vital importance to thermal management, energy, and environmental applications. However, it remains a great challenge to tailor the surface structure and wettability inside the deformed tubes of slim and complicated feature. Here, we describe an electrochemical anodization strategy to achieve uniform and superhydrophobic coating of TiO2 nanotube arrays throughout the inner surface in deformed/bend titanium tubes. Guided by a hybrid carbon fibre cathode, conformal electric field can be generated to adaptatively fit the complex geometries in the deformed tube, where the structural design with rigid insulating beads can self-stabilize the hybrid cathode at the coaxial position of the tube with the electrolyte flow. As a result, we obtain a superhydrophobic coating with a water contact angle of 157 and contact angle hysteresis of 10. Substantial drag reduction can be realised with an overall reduction up to 25.8 for the anodized U-shaped tube. Furthermore, we demonstrate to spatially coat tubes with complex geometries, to achieve energy-saving liquid transportation. This facile coating strategy has great implications in liquid transport processes with the user-friendly approach to engineer surface regardless of the deformation of tube/pipe.

Item Type: Article
Additional Information: Funding information: The authors acknowledge the financial support from the National Natural Science Foundation of China (No. 51871037), the Natural Science Foundation of Chongqing, China (No. CQYC201905023), the Chongqing Talents: Exceptional Young Talents Project (No. cstc2021ycjh-bgzxm0063), the National Key Research and Development Program of China (No. 2020YFF0421893), and the Engineering and Physical Sciences Research Council (EPSRC) grant-EP/N007921/1.
Uncontrolled Keywords: electrochemical anodization, TiO2 nanotubes, wetting, deformed tube, drag reduction
Subjects: F200 Materials Science
H800 Chemical, Process and Energy Engineering
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: John Coen
Date Deposited: 17 Nov 2021 13:55
Last Modified: 22 Nov 2021 08:24

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