Experimental investigation of the wetting characteristics of an aqueous ionic liquid solution on an aluminum fin-tube substrate

被引:25
作者
Varela, Richard Jayson [1 ]
Giannetti, Niccolo [2 ]
Yamaguchi, Seiichi [2 ]
Saito, Kiyoshi [2 ]
Wang, Xin-Ming [3 ]
Nakayama, Hiroshi [4 ]
机构
[1] Waseda Univ, Dept Appl Mech, Shinjuku Ku, 3-4-1 Okubo, Tokyo 1698555, Japan
[2] Waseda Univ, Dept Appl Mech & Aerosp Engn, Shinjuku Ku, 3-4-1 Okubo, Tokyo 1698555, Japan
[3] Evonik Japan Co Ltd, Shinjuku Ku, 2-3-1 Nishi Shinjuku, Tokyo 1630938, Japan
[4] Chubu Elect Power Co Inc, Energy Applicat R&D Ctr, 20-1Midori Ku, Nagoya, Aichi 4598522, Japan
来源
INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID | 2018年 / 88卷
关键词
Contact angle hysteresis; Wetting hysteresis; Ionic liquid; Aluminum fin-tube; Wetting characteristics; MASS-TRANSFER COEFFICIENTS; WETTED AREA; CONTACT-ANGLE; FILM; HYSTERESIS; AIR; SYSTEM; PERFORMANCE; EVAPORATION; ABSORPTION;
D O I
10.1016/j.ijrefrig.2018.02.019
中图分类号
O414.1 [热力学];
学科分类号
摘要
In falling film liquid desiccant systems, finding a suitable pair of liquid desiccant and contact surface is of primary engineering interest. This requires knowledge on the wetting characteristics of the liquid on the solid substrate, which consequently requires intensive experimental investigation. In this study, the wetting characteristics of a new ionic liquid aqueous solution in an aluminum fin-tube substrate were experimentally investigated. Then, a simple method for estimating the wetted area on the substrate through image processing was developed. Visual analysis of the surface wetting was also conducted, and three types of wetting patterns are discussed. Experimental results on the static contact angle and contact angle hysteresis suggest that the ionic liquid solution is mostly wetting, and the aluminum surface is slightly to moderately rough. It was found that the wettability of the ionic liquid solution increases as the ionic liquid mass fraction increases. The wetting hysteresis phenomenon and the factors contributing to its occurrence were also clarified. The results from this study would be useful for the development of a new model or improvement of existing wetting models, which can help improve the prediction and control of the heat and mass transfer performance in internally cooled/heated fin-tube contactors. (C) 2018 Elsevier Ltd and IIR. All rights reserved.
引用
收藏
页码:472 / 482
页数:11
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