Nano-structured aluminum surfaces for dropwise condensation

被引：45

作者：

Parin, Riccardo ^{[1
]}

Martucci, Alessandro ^{[1
]}

Sturaro, Marco ^{[1
]}

Bortolin, Stefano ^{[1
]}

Bersani, Marco ^{[2
]}

Carraro, Francesco ^{[3
]}

Del Col, Davide ^{[1
]}

机构：

[1] Univ Padua, Dipartimento Ingn Ind, Via Venezia 1, I-35131 Padua, Italy

[2] UCL, Chem Dept, Christopher Ingold Labs, 20 Gordon St, London WC1H 0AJ, England

[3] Univ Padua, Dipartimento Sci Chim, Via Marzolo 1, I-35131 Padua, Italy

来源：

SURFACE & COATINGS TECHNOLOGY | 2018年 / 348卷

关键词：

Dropwise condensation; Superhydrophobic surfaces; Cassie-Wenzel transition; Metal substrate; HEAT-TRANSFER; SUPERHYDROPHOBIC SURFACES; HYDROPHOBIC SURFACE; DROPLET MOBILITY; WETTABILITY; FILMS; WATER; FABRICATION; COATINGS; POLYMER;

D O I：

10.1016/j.surfcoat.2018.05.018

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Superhydrophobic surfaces represent a promising strategy to consistently promote dropwise condensation, which can lead to an important increase of the heat transfer coefficient as compared to filmwise condensation. To get superhydrophobicity, it is necessary to reduce the surface energy and to modify the surface structure by achieving superficial micro-roughness. In this work, aluminum surfaces were modified via chemical methods to promote dropwise condensation due to superhydrophobic behavior. The metal substrates were etched using three different strategies to impart nanoscale roughness; a fluorosilane film was subsequently deposited over them to decrease the surface energy in two different modes (spin coating and immersion). In the end, four different surfaces were investigated. Experimental tests of pure steam condensation on the resulting substrates showed that dropwise condensation was successfully achieved on the superhydrophobic surfaces, measuring heat transfer coefficients as high as 100 kW m(-2) K-1. Although the dropwise condensation moves soon to hybrid and filmwise condensation, the performance during pure dropwise condensation appears to be clearly linked to the different chemical procedures used in the sample preparation.

引用

页码：1 / 12

页数：12

共 45 条

[1] Rothstein J.P., Slip on superhydrophobic surfaces, Annu. Rev. Fluid Mech., 42, pp. 89-109, (2010)
[2] Antonini C., Innocenti M., Horn T., Marengo M., Amirfazli A., Understanding the effect of superhydrophobic coatings on energy reduction in anti-icing systems, Cold Reg. Sci. Technol., 67, pp. 58-67, (2011)
[3] Betz A.R., Jenkins J., Kim C.J., Attinger D., Boiling heat transfer on superhydrophilic, superhydrophobic, and superbiphilic surfaces, Int. J. Heat Mass Transf., 57, pp. 733-741, (2013)
[4] Zhang Q.Y., Long Z.H., Ren C.S., Guo B.H., Xu D.Q., Ma T.C., Multi-beam Mixing Implantation System and Its Applications, 104, pp. 195-199, (1998)
[5] Quere D., Non-sticking drops, Rep. Prog. Phys., 68, pp. 2495-2532, (2005)
[6] Enright R., Miljkovic N., Alvarado J.L., Kim K., Rose J.W., Dropwise condensation on micro- and nanostructured surfaces, Nanoscale Microscale Thermophys. Eng., 18, pp. 223-250, (2014)
[7] Schmidt E., Schurig W., Sellschopp W., Versuche über die kondensation von wasserdampf in film- und tropfenform, Forsch. Ingenieurwes., 1, pp. 53-63, (1930)
[8] Rausch M.H., Froba A.P., Leipertz A., Dropwise condensation heat transfer on ion implanted aluminum surfaces, Int. J. Heat Mass Transf., 51, pp. 1061-1070, (2008)
[9] Lu S., Chen Y., Xu W., Liu W., Controlled growth of superhydrophobic films by sol-gel method on aluminum substrate, Appl. Surf. Sci., 256, pp. 6072-6075, (2010)
[10] Paxson A.T., Yague J.L., Gleason K.K., Varanasi K.K., Stable dropwise condensation for enhancing heat transfer via the initiated chemical vapor deposition (iCVD) of grafted polymer films, Adv. Mater., 26, pp. 418-423, (2014)

← 1 2 3 4 5 →