Nano/microcomposite surface fabricated by chemical treatment/microembossing for control of bubbles in boiling heat transfer. Issue 1 (2016)

• Record Type: Journal Article
• Authors: Nagato, Keisuke; Miyazaki, Shumpei; Yamada, Shuhei; Nakao, Masayuki
• Is Part Of: CIRP annals. Volume 65:Issue 1(2016)
• Page Start: 511
• Page End: 514
• Publication Date: 2016
• Subjects: Micro forming -- Nano structure -- Phase transition; Production engineering -- Research -- Periodicals; 670.5
• DOI: 10.1016/j.cirp.2016.04.073
• Languages: English
• ISSNs: 0007-8506

Abstract

Abstract: Nucleate boiling heat transfer is widely used in various heat exchangers because the heat of a solid is effectively transferred to a liquid. To obtain a higher heat-transfer coefficient, it is generally desirable for small bubbles to be frequently generated and detach from the surface. In this study, the generation and the growth/detachment of bubbles are accelerated using 100-nm-scale nanostructures and 10-μm-scale microstructures, respectively. Boehmite nanostructures and inverse-pyramid microstructures are fabricated by chemical treatment and embossing on aluminum surfaces, respectively. The heat transfer properties of the samples are measured and the effects of the structures on the nucleation, growth, and detachment of bubbles are investigated.