Pool-boiling performance on thin metal foils with graphene-oxide-nanoflake deposit

Bregar, Tadej (author), Vodopivec, Matevž (author), Pečnik, Tim (author), Zupančič, Matevž (author), Golobič, Iztok (author)

The pool-boiling performance of water on thin metal foils with graphene-oxide deposition was studied. The boiling performance was evaluated both on fully coated surfaces, achieved by spin-coating, and surfaces with a laser-textured nucleation site, into which graphene oxide was added via drop-casting. During the experiments, a high-speed IR camera was used to obtain the transient temperature and heat-flux distribution. At the same time, a high-speed video camera was used to acquire synchronized bubble-growth recordings. In addition, a surface-wettability analysis was conducted for all the samples. In the case of fully coated samples, graphene-oxide deposition resulted in an increased number of active nucleation sites and an increase in the nucleation temperature, leading to a lowered nucleation frequency. Meanwhile, samples with a single laser-textured nucleation site enabled the analysis of isolated vapor bubbles, confirming that graphene-oxide deposition leads to a higher nucleation temperature, consequently resulting in a larger bubble-departure diameter and longer growth time. Two explanations for the results are proposed: the wettability of graphene-oxide deposition and the filling of surface microcavities with graphene-oxide nanoflakes.

• Language: English
• Keywords: graphene oxide, nanocoating, nucleate boiling, local heat flux, nucleation site density
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2022
• Number of pages: 16 str.
• Numbering: Vol. 12, iss. 16, art. 2772
• PID: 20.500.12556/RUL-138760
• UDC: 66.02
• ISSN on article: 2079-4991
• DOI: 10.3390/nano12162772
• COBISS.SI-ID: 118246915
• Publication date in RUL: 16.08.2022

Record is a part of a journal

• Title: Nanomaterials
• Shortened title: Nanomaterials
• Publisher: MDPI
• 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: grafenov oksid, nanopremazi, mehurčkasto vrenje, lokalna gostota toplotnega toka, gostota aktivnih nukleacijskih mest