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Experimental investigation of single-bubble growth during the saturated pool boiling of water and self-rewetting aqueous n-butanol mixtures
ID
Zupančič, Matevž
(
Avtor
),
ID
Zakšek, Peter
(
Avtor
),
ID
Golobič, Iztok
(
Avtor
)
PDF - Predstavitvena datoteka,
prenos
(5,61 MB)
MD5: D845ECC2159A013725F2EC4272684BEC
URL - Izvorni URL, za dostop obiščite
https://www.sciencedirect.com/science/article/pii/S2214157X21006766
Galerija slik
Izvleček
Self-rewetting fluids are commonly used in heat pipes, but their performance is not well understood in pool boiling. Here, we performed boiling of n-butanol-water mixtures on thin titanium foil and utilized synchronous high-speed IR and video cameras to capture transient temperature fields and bubble dynamics. At the onset of nucleate boiling, self-rewetting fluids offered higher nucleation site density and smaller bubble diameters compared to water. However, with increasing heat flux, a significant depletion of n-butanol was created in the vicinity of nucleation sites, which caused periodic temporal fluctuations in nucleation temperature and bubble evaporation energy. Average surface temperature and bubble departure diameter for self-rewetting fluids even exceeded the values of pure water. This shows that Marangoni effects cannot overcome limited mass diffusion of more volatile component towards nucleation sites in pool boiling on flat horizontal heaters. Based on our observations, the use of a self-rewetting fluid will not increase the heat transfer coefficient when compared to pure water, which is also known for conventional mixtures with negative temperature-dependent surface tension. Our experiments offer a step towards better understanding nucleate boiling of complex mixtures and a possibility for indirect evaluation of concentration variations based on synchronous high-speed video and IR thermography.
Jezik:
Angleški jezik
Ključne besede:
pool boiling
,
water
,
n-butanol
,
self-rewetting fluids
,
IR thermography
,
high-speed imaging
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:
11 str.
Številčenje:
Vol. 28, art. 101513
PID:
20.500.12556/RUL-131956
UDK:
536.24
ISSN pri članku:
2214-157X
DOI:
10.1016/j.csite.2021.101513
COBISS.SI-ID:
79463683
Datum objave v RUL:
07.10.2021
Število ogledov:
791
Število prenosov:
186
Metapodatki:
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Objavi na:
Gradivo je del revije
Naslov:
Case studies in thermal engineering
Založnik:
Elsevier
ISSN:
2214-157X
COBISS.SI-ID:
519660057
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:
vrenje v bazenu
,
voda
,
n-butanol
,
samoomočljivi fluidi
,
IR termografija
,
hitrotekoča vizualizacija
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)
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