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

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

Povzetek

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.

Ključne besede

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;

Podatki

Jezik:	Angleški jezik
Leto izida:	2022
Tipologija:	1.01 - Izvirni znanstveni članek
Organizacija:	UL FS - Fakulteta za strojništvo
UDK:	66.02
COBISS:	118246915
ISSN:	2079-4991
Št. ogledov:	213
Št. prenosov:	62
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Slovenski jezik
Sekundarne ključne besede:	grafenov oksid;nanopremazi;mehurčkasto vrenje;lokalna gostota toplotnega toka;gostota aktivnih nukleacijskih mest;
Vrsta dela (COBISS):	Članek v reviji
Strani:	str. 1-17
Letnik:	ǂVol. ǂ12
Zvezek:	ǂiss. ǂ16
Čas izdaje:	Aug. 2022
DOI:	10.3390/nano12162772
ID:	16189570