Effect of surface wettability on nanoparticle deposition during pool boiling on laser-textured copper surfaces

Berce, Jure (author), Hadžić, Armin (author), Može, Matic (author), Arhar, Klara (author), Gjerkeš, Henrik (author), Zupančič, Matevž (author), Golobič, Iztok (author)

Prior studies have evidenced the potential for enhancing boiling heat transfer through modifications of surface or fluid properties. The deployment of nanofluids in pool boiling systems is challenging due to the deposition of nanoparticles on structured surfaces, which may result in performance deterioration. This study addresses the use of TiO$_2$–water nanofluids (mass concentrations of 0.001 wt.% and 0.1 wt.%) in pool boiling heat transfer and concurrent mitigation of nanoparticle deposition on superhydrophobic laser-textured copper surfaces. Samples, modified through nanosecond laser texturing, were subjected to boiling in an as-prepared superhydrophilic (SHPI) state and in a superhydrophobic state (SHPO) following hydrophobization with a self-assembled monolayer of fluorinated silane. The boiling performance assessment involved five consecutive boiling curve runs under saturated conditions at atmospheric pressure. Results on superhydrophilic surfaces reveal that the use of nanofluids always led to a deterioration of the heat transfer coefficient (up to 90%) compared to pure water due to high nanoparticle deposition. The latter was largely mitigated on superhydrophobic surfaces, yet their performance was still inferior to that of the same surface in water. On the other hand, CHF values of 1209 kW m$^{−2}$ and 1462 kW m$^{−2}$ were recorded at 0.1 wt.% concentration on both superhydrophobic and superhydrophilic surfaces, respectively, representing a slight enhancement of 16% and 27% compared to the results obtained on their counterparts investigated in water.

• Language: English
• Keywords: nanoparticles, nanoparticle deposition, nanofluids, laser texturing, hydrophobization, boiling heat transfer
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2024
• Number of pages: 17 str.
• Numbering: Vol. 14, iss. 3, art. 311
• PID: 20.500.12556/RUL-154374
• UDC: 620.3:544:536.24
• ISSN on article: 2079-4991
• DOI: 10.3390/nano14030311
• COBISS.SI-ID: 184768771
• Publication date in RUL: 12.02.2024

Record is a part of a journal

• Title: Nanomaterials
• Shortened title: Nanomaterials
• Publisher: MDPI AG
• ISSN: 2079-4991
• COBISS.SI-ID: 523286297

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: nanodelci, odlaganje nanodelcev, nanofluidi, lasersko teksturiranje, hidrofobizacija, prenos toplote pri vrenju