Investigation of nucleate pool boiling of saturated pure liquids and ethanol-water mixtures on smooth and laser-textured surfaces

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

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.

• Jezik: Angleški jezik
• Ključne besede: pool boiling, water, ethanol, binary mixtures, laser surface engineering, laser texturing, capillary length
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FS - Fakulteta za strojništvo
• Status publikacije: Objavljeno
• Različica publikacije: Recenzirani rokopis
• Leto izida: 2020
• Št. strani: Str. 29-42
• Številčenje: Vol. 24, iss. 1
• PID: 20.500.12556/RUL-114827
• UDK: 66.02(045)
• ISSN pri članku: 1556-7265
• DOI: 10.1080/15567265.2019.1689590
• COBISS.SI-ID: 16891675
• Datum objave v RUL: 16.03.2020

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: vrenje v bazenu, voda, etanol, binarne zmesi, laserski inženiring površin, lasersko strukturiranje, kapilarna dolžina