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

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

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.

Keywords

grafenov oksid;nano premazi;mehurčkasto vrenje;lokalna gostota toplotnega toka;gostota aktivnih nukleacijskih mest;graphene oxide;nanocoating;nucleate boiling;local heat flux;nucleation site density;

Data

Language:	English
Year of publishing:	2022
Typology:	1.01 - Original Scientific Article
Organization:	UL FS - Faculty of Mechanical Engineering
UDC:	66.02
COBISS:	118246915
ISSN:	2079-4991
Views:	213
Downloads:	62
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	Slovenian
Secondary keywords:	grafenov oksid;nanopremazi;mehurčkasto vrenje;lokalna gostota toplotnega toka;gostota aktivnih nukleacijskih mest;
Type (COBISS):	Article
Pages:	str. 1-17
Volume:	ǂVol. ǂ12
Issue:	ǂiss. ǂ16
Chronology:	Aug. 2022
DOI:	10.3390/nano12162772
ID:	16189570