Peter Zakšek (Author), Matevž Zupančič (Author), Peter Gregorčič (Author), Iztok Golobič (Author)

Abstract

Nucleate pool boiling experiments were performed on plain and five laser-textured stainless-steel foils using saturated pure water, 100% ethanol, 0.4% and 4.2% mole fraction ethanol-water mixtures. All laser-textured samples contained untreated, smooth 0.5 mm wide regions and intermediate textured surfaces, that differ in the width of the laser patterned regions (from 0.5 mm to 2.5 mm). For smooth surfaces, we measured significant decreases in average heat transfer coefficients (HTC) and increases in bubble activation temperatures in comparison with the laser-textured surfaces for all the tested working fluids. Significant enhancement in HTC (280%) on a textured heating surface with 2.5-mm-wide laser pattern was recorded using pure water. For pure ethanol, the highest enhancement of 268% was achieved on a heating surface with 1.5-mm-wide laser pattern. The highest enhancement of HTC for the tested binary mixtures was obtained using 2.0-mm wide-laser-textured regions (HTC improved by 235% and 279% for the 0.4% and 4.2% mixtures, respectively). Our results indicate that laser texturing can significantly improve boiling performance when the intervals of the laser-textured patterns are close to the capillary lengths of the tested fluids.

Keywords

pool boiling;water;ethanol;binary mixtures;laser surface engineering;laser texturing;capillary length;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FS - Faculty of Mechanical Engineering
UDC: 66.02(045)
COBISS: 16891675 Link will open in a new window
ISSN: 1556-7265
Views: 628
Downloads: 259
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Other data

Secondary language: Slovenian
Secondary keywords: vrenje v bazenu;voda;etanol;binarne zmesi;laserski inženiring površin;lasersko strukturiranje;kapilarna dolžina;
Type (COBISS): Article
Embargo end date (OpenAIRE): 2021-03-16
Pages: str. 29-42
Volume: ǂVol. ǂ24
Issue: ǂiss. ǂ1
Chronology: 2020
DOI: 10.1080/15567265.2019.1689590
ID: 11442078