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Influence of hydrodynamic interactions among multiple bubbles on convective heat transfer in nucleate boiling
ID
Takeyama, Mao
(
Author
),
ID
Zupančič, Matevž
(
Author
),
ID
Kunugi, Tomoaki
(
Author
)
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https://www.sciencedirect.com/science/article/pii/S0894177721000984?via%3Dihub#!
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Abstract
To clear the effects of the hydrodynamic interactions among neighboring vapor bubbles on the saturated pool boiling heat transfer, artificial nucleation sites with several cavity arrangements were manufactured on the substrate surface and measured liquid temperatures near heated substrate by a miniature thermocouple probe with 10 kHz. The surface temperature of heated substrate was measured by an infrared camera with 1 kHz and bubble dynamics were simultaneously visualized by a high-speed video camera with 5 kHz and 10 kHz, respectively. The liquid temperature fluctuations, measured with micro thermocouple 100 %m and 10 %m above the substrate surface, were compared among each other and with the transient temperature fields obtained through IR measurements. Results showed that the hydrodynamic interaction among neighboring bubbles causes the liquid convection, that was only detected 100 %m above the boiling surface. Generally, the degree of liquid temperature fluctuations at 10 %m height and different arrangements of nucleation sites was under 1 K. Here the superheated sublayer in the vicinity of the boiling surface was generally not affected by the convection. Only when the coalescence from two neighboring nucleation sites occurred and the liquid-vapor interface nearly reached the substrate, a steep temperature drop over 2 K was detected. It was concluded that the viscous sublayer stably exists during boiling of water in lower heat flux conditions. To enhance the convective heat transfer in nucleate boiling, coalesced bubble needs to peel off the viscous sublayer during its deformation. Based on the measurements in this study, this peel-off effect only happens when the coalescence point is less than 1 mm above the heated surface.
Language:
English
Keywords:
nucleate boiling
,
bubble coalescence
,
superheated sublayer
,
convection effect
,
liquid temperature measurement
,
substrate temperature measurement
Work type:
Article
Typology:
1.01 - Original Scientific Article
Organization:
FS - Faculty of Mechanical Engineering
Publication status:
Published
Publication version:
Author Accepted Manuscript
Year:
2021
Number of pages:
Str. 1-11
Numbering:
Vol. 128, art. 110449
PID:
20.500.12556/RUL-127505
UDC:
536.24
ISSN on article:
0894-1777
DOI:
10.1016/j.expthermflusci.2021.110449
COBISS.SI-ID:
66639875
Publication date in RUL:
11.06.2021
Views:
1156
Downloads:
73
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Record is a part of a journal
Title:
Experimental thermal and fluid science
Shortened title:
Exp. therm. fluid sci.
Publisher:
Elsevier
ISSN:
0894-1777
COBISS.SI-ID:
170523
Licences
License:
CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:
http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:
The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:
01.10.2021
Secondary language
Language:
Slovenian
Keywords:
mehurčkasto vrenje
,
koalescence mehurčkov
,
pregreta plast
,
konvektivni učinki
,
meritve temperature v kapljevini
,
meritve temperature na površini
Projects
Funder:
ARRS - Slovenian Research Agency
Project number:
P2-0223
Name:
Prenos toplote in snovi
Funder:
ARRS - Slovenian Research Agency
Project number:
J2-1741
Name:
Lasersko mikro in nanostrukturiranje za razvoj biomimetičnih kovinskih površin z edinstvenimi lastnostmi (LaMiNaS)
Funder:
ARRS - Slovenian Research Agency
Project number:
J2-2486
Name:
Izboljšan prenos toplote pri vrenju z uporabo hierarhičnih funkcionaliziranih površin (eHEATs)
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