TY - JOUR

T1 - Experimental Study of Pool Boiling on Heaters with Nanomodified Surfaces under Saturation

AU - Khmel, Sergey

AU - Baranov, Evgeniy

AU - Vladimirov, Victor

AU - Safonov, Alexey

AU - Chinnov, Evgeny

N1 - Publisher Copyright: © 2021 Taylor & Francis Group, LLC.

PY - 2022

Y1 - 2022

N2 - A technology has been developed for the synthesis of arrays of oriented microropes and cocoon-like microstructures consisting of silicon oxide nanowires on a copper substrate with barrier layers of silicon dioxide, molybdenum, and tungsten. In experiments, a copper surface coated with a tungsten layer showed the best stability and technological applicability. Experiments were performed to study pool boiling heat transfer on copper heaters with nanomodified surfaces under saturation conditions. A comparison of the data on heat transfer enhancement on smooth and nanomodified hydrophilic and hydrophobic copper surfaces was made. Relatively high heat transfer coefficients were observed on copper surfaces with a tungsten barrier layer initially coated with microropes and micrococoons. The experiments showed that microropes from nanowires were not resistant to boiling; micrococoons from nanowires were more stable. Superhydrophobic surfaces were produced by hot-wire chemical vapor deposition (HWCVD) of fluoropolymer coatings on micrococoons. In the boiling experiments, the greatest heat transfer enhancement was obtained on such surfaces. The fluoropolymer coating was shown to lose its continuity. As a result, a random biphilic coating was formed and intense bubble boiling occurred in local hydrophobic areas of the fluoropolymer, resulting in heat transfer enhancement.

AB - A technology has been developed for the synthesis of arrays of oriented microropes and cocoon-like microstructures consisting of silicon oxide nanowires on a copper substrate with barrier layers of silicon dioxide, molybdenum, and tungsten. In experiments, a copper surface coated with a tungsten layer showed the best stability and technological applicability. Experiments were performed to study pool boiling heat transfer on copper heaters with nanomodified surfaces under saturation conditions. A comparison of the data on heat transfer enhancement on smooth and nanomodified hydrophilic and hydrophobic copper surfaces was made. Relatively high heat transfer coefficients were observed on copper surfaces with a tungsten barrier layer initially coated with microropes and micrococoons. The experiments showed that microropes from nanowires were not resistant to boiling; micrococoons from nanowires were more stable. Superhydrophobic surfaces were produced by hot-wire chemical vapor deposition (HWCVD) of fluoropolymer coatings on micrococoons. In the boiling experiments, the greatest heat transfer enhancement was obtained on such surfaces. The fluoropolymer coating was shown to lose its continuity. As a result, a random biphilic coating was formed and intense bubble boiling occurred in local hydrophobic areas of the fluoropolymer, resulting in heat transfer enhancement.

UR - http://www.scopus.com/inward/record.url?scp=85120848557&partnerID=8YFLogxK

U2 - 10.1080/01457632.2021.2009211

DO - 10.1080/01457632.2021.2009211

M3 - Article

AN - SCOPUS:85120848557

VL - 43

SP - 1724

EP - 1742

JO - Heat Transfer Engineering

JF - Heat Transfer Engineering

SN - 0145-7632

IS - 20

ER -