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Hydrophilic and hydrophobic nanostructured copper surfaces for efficient pool boiling heat transfer with water, water/butanol mixtures and Novec 649
ID Može, Matic (Avtor), ID Vajc, Viktor (Avtor), ID Zupančič, Matevž (Avtor), ID Golobič, Iztok (Avtor)

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Izvleček
Increasing heat dissipation requirements of small and miniature devices demands advanced cooling methods, such as application of immersion cooling via boiling heat transfer. In this study, functionalized copper surfaces for enhanced heat transfer are developed and evaluated. Samples are functionalized using a chemical oxidation treatment with subsequent hydrophobization of selected surfaces with a fluorinated silane. Pool boiling tests with water, water/1-butanol mixture with self-rewetting properties and a novel dielectric fluid with low GWP (Novec™ 649) are conducted to evaluate the boiling performance of individual surfaces. The results show that hydrophobized functionalized surfaces covered by microcavities with diameters between 40 nm and 2 µm exhibit increased heat transfer coefficient (HTC; enhancements up to 120%) and critical heat flux (CHF; enhancements up to 64%) values in comparison with the untreated reference surface, complemented by favorable fabrication repeatability. Positive surface stability is observed in contact with water, while both the self-rewetting fluids and Novec™ 649 gradually degrade the boiling performance and in some cases also the surface itself. The use of water/1-butanol mixtures in particular results in surface chemistry and morphology changes, as observed using SEM imaging and Raman spectroscopy. This seems to be neglected in the available literature and should be focused on in further studies.

Jezik:Angleški jezik
Ključne besede:copper nanostructures, surface engineering, pool boiling, nucleate boiling, enhanced heat transfer, self‐rewetting fluids, Novec 649
Vrsta gradiva:Članek v reviji
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:FS - Fakulteta za strojništvo
Status publikacije:Objavljeno
Različica publikacije:Objavljena publikacija
Leto izida:2021
Št. strani:24 str.
Številčenje:Vol. 11, iss. 12, art. 3216
PID:20.500.12556/RUL-133569 Povezava se odpre v novem oknu
UDK:536.24:542.467:669.3
ISSN pri članku:2079-4991
DOI:10.3390/nano11123216 Povezava se odpre v novem oknu
COBISS.SI-ID:87305987 Povezava se odpre v novem oknu
Datum objave v RUL:01.12.2021
Število ogledov:1143
Število prenosov:156
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Gradivo je del revije

Naslov:Nanomaterials
Skrajšan naslov:Nanomaterials
Založnik:MDPI
ISSN:2079-4991
COBISS.SI-ID:523286297 Povezava se odpre v novem oknu

Licence

Licenca:CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
Povezava:http://creativecommons.org/licenses/by/4.0/deed.sl
Opis:To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.
Začetek licenciranja:01.12.2021

Sekundarni jezik

Jezik:Slovenski jezik
Ključne besede:bakrene nanostrukture, inženiring površin, vrenje v bazenu, mehurčkasto vrenje, izboljšan prenos toplote, samoomočljivi fluidi, Novec 649

Projekti

Financer:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Številka projekta:P2-0223
Naslov:Prenos toplote in snovi

Financer:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Številka projekta:J2-2486
Naslov:Izboljšan prenos toplote pri vrenju z uporabo hierarhičnih funkcionaliziranih površin (eHEATs)

Financer:Drugi - Drug financer ali več financerjev
Program financ.:Czech Republic, Ministry of Education, Youth and Sports, OP RDE
Številka projekta:CZ. 02.1.01/0.0/0.0/16_019/0000753

Financer:Drugi - Drug financer ali več financerjev
Program financ.:Czech Technical University in Prague, Grant Agency
Številka projekta:SGS20/119/OHK2/2T/12

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