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Pool-boiling performance on thin metal foils with graphene-oxide-nanoflake deposit
ID Bregar, Tadej (Author), ID Vodopivec, Matevž (Author), ID Pečnik, Tim (Author), ID Zupančič, Matevž (Author), ID Golobič, Iztok (Author)

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Abstract
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 This link opens in a new window
UDC:66.02
ISSN on article:2079-4991
DOI:10.3390/nano12162772 This link opens in a new window
COBISS.SI-ID:118246915 This link opens in a new window
Publication date in RUL:16.08.2022
Views:1419
Downloads:90
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Record is a part of a journal

Title:Nanomaterials
Shortened title:Nanomaterials
Publisher:MDPI AG
ISSN:2079-4991
COBISS.SI-ID:523286297 This link opens in a new window

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

Projects

Funder:ARRS - Slovenian Research Agency
Project number:P2-0223
Name:Prenos toplote in snovi

Funder:ARRS - Slovenian Research Agency
Project number:J2-2486
Name:Izboljšan prenos toplote pri vrenju z uporabo hierarhičnih funkcionaliziranih površin (eHEATs)

Funder:ARRS - Slovenian Research Agency
Project number:N2-0251
Name:Izboljšanje procesa vrenja z uporabo teksturiranih površin (BEST)

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