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The wall heat flux partitioning during the pool boiling of water on thin metallic foils
ID Zupančič, Matevž (Avtor), ID Gregorčič, Peter (Avtor), ID Bucci, Mattia (Avtor), ID Wang, Chi (Avtor), ID Aguiar, Gustavo Matana (Avtor), ID Bucci, Matteo (Avtor)

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Izvleček
In this work, we studied the wall heat flux partitioning during the pool boiling of water on thin metallic surfaces. We conducted boiling experiments on surfaces where we engineered nucleation sites by nanosecond-fiber-laser texturing. These nucleation sites form triangular lattice patterns with different pitches. We measured the time-dependent temperature and heat flux distributions on the boiling surface using an infrared camera. We developed post-processing algorithms to measure, based on these distributions, all the fundamental boiling parameters used in heat flux partitioning models (e.g., nucleation site density, bubble wait and growth time, and bubble footprint radius) and the actual partitioning of the heat flux, i.e., how much heat is transferred by evaporation of the microlayer, rewetting of the surface, and convective effects. This work reveals that the mechanisms of heat transfer on substrates of small thermal capacity are very different compared to substrates of large thermal capacity. With water, the bubble microlayer typically does not dry out and the surface temperature at rewetting is practically the same as the rewetting fluid temperature. These effects limit the efficiency of microlayer evaporation and rewetting heat transfer. Instead, convective effects generated by the bubble growth process remove most of the energy from the heated surface. This behavior is captured by a heat flux partitioning model that we re-derived from first principles to describe the heat transfer mechanisms on substrate of small thermal capacity.

Jezik:Angleški jezik
Ključne besede:nucleate boiling, thin metallic foils, surface laser micro-engineering, infrared thermometry, heat flux partitioning
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:2022
Št. strani:16 str.
Številčenje:Vol. 200, art. 117638
PID:20.500.12556/RUL-132089 Povezava se odpre v novem oknu
UDK:536:66.02(045)
ISSN pri članku:1359-4311
DOI:10.1016/j.applthermaleng.2021.117638 Povezava se odpre v novem oknu
COBISS.SI-ID:80131843 Povezava se odpre v novem oknu
Datum objave v RUL:12.10.2021
Število ogledov:783
Število prenosov:223
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Gradivo je del revije

Naslov:Applied thermal engineering
Skrajšan naslov:Appl. therm. eng.
Založnik:Elsevier Science
ISSN:1359-4311
COBISS.SI-ID:1861910 Povezava se odpre v novem oknu

Licence

Licenca:CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
Povezava:http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
Opis:Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.

Sekundarni jezik

Jezik:Slovenski jezik
Ključne besede:mehurčkasto vrenje, tanke kovinske folije, laserska mikroobdelava površin, infrardeča termografija, delitev toplotnega toka

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:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Številka projekta:J2-1741
Naslov:Lasersko mikro- in nanostrukturiranje za razvoj biomimetičnih kovinskih površin z edinstvenimi lastnostmi (LaMiNaS)

Financer:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Program financ.:BIL – SLO-ZDA 2019-2021

Financer:Drugi - Drug financer ali več financerjev
Program financ.:US Nuclear Regulatory Commission

Financer:NSF - National Science Foundation
Številka projekta:2019245

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