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Enhanced nucleate boiling of Novec 649 on thin metal foils via laser-induced periodic surface structures
ID
Zupančič, Matevž
(
Author
),
ID
Fontanarosa, Donato
(
Author
),
ID
Može, Matic
(
Author
),
ID
Bucci, Mattia
(
Author
),
ID
Vodopivec, Matevž
(
Author
),
ID
Nagarajan, Balasubramanian
(
Author
),
ID
Vetrano, Maria Rosaria
(
Author
),
ID
Castagne, Sylvie
(
Author
),
ID
Golobič, Iztok
(
Author
)
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https://www.sciencedirect.com/science/article/pii/S135943112301832X
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Abstract
The low boiling temperature of dielectric fluids makes them suitable for satisfying the cooling requirements of advanced high-energy-density devices commonly found in microelectronics. However, the high wettability/wickability of such coolants significantly affects the boiling dynamics, opening new research questions on the crucial role played by micro- and nanostructures on the boiling surface. While different studies point out the importance of microscale grooves, pillars and cavities to promote nucleation and enhance boiling heat transfer coefficient (HTC) for water, the scientific data to support such observations for dielectric fluids is sparse. In this regard, the present work provides an experimental investigation of the nucleate boiling enhancement of Novec 649 on thin metallic stainless-steel foils with tailored, laser-induced periodic surface structures (LIPSS). Femtosecond laser surface texturing was utilized to produce LIPSS with a periodicity of approx. 720 nm, while selected samples additionally included microscale grooves with a depth of 19.6 µm and a width of 25 µm, overlapped with the LIPSS features (labelled as GLIPSS). During boiling performance evaluation, high-speed IR thermography was used to measure the transient temperature fields of the boiling surface. LIPSS samples exhibited a reduction in wall superheat at the onset of boiling from 28 K to about 16 K, resulting in an HTC enhancement of about +65 %. Analysis of IR data was performed through multiscale proper orthogonal decomposition (mPOD) and revealed that the HTC enhancement in the presence of LIPSS is related to a faster heat transfer dynamics (dominant frequency: +54 %) occurring at a smaller spatial scale (dominant mean active site diameter: −12.5 %) and larger spatial density (dominant mean active site density: +39 %). Furthermore, the results for GLIPSS samples revealed a weak impact of micro features to the boiling performance of Novec 649, implying that sub-microscale surface topography is crucial to promote boiling in applications using dielectrics.
Language:
English
Keywords:
nucleate boiling
,
heat transfer enhancement
,
dielectric fluids
,
thin metallic foils
,
laser microstructuring
,
surface structures
,
laser induced periodic surface structures
Work type:
Article
Typology:
1.01 - Original Scientific Article
Organization:
FS - Faculty of Mechanical Engineering
Publication status:
Published
Publication version:
Version of Record
Year:
2024
Number of pages:
13 str.
Numbering:
Vol. 236, pt. D, art. 121803
PID:
20.500.12556/RUL-152102-c8de9726-203e-a07a-cc6d-c2a5207169b3
UDC:
536.24:544:66.02
ISSN on article:
1359-4311
DOI:
10.1016/j.applthermaleng.2023.121803
COBISS.SI-ID:
170665731
Publication date in RUL:
03.11.2023
Views:
806
Downloads:
53
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Record is a part of a journal
Title:
Applied thermal engineering
Shortened title:
Appl. therm. eng.
Publisher:
Elsevier Science
ISSN:
1359-4311
COBISS.SI-ID:
1861910
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.
Secondary language
Language:
Slovenian
Keywords:
mehurčkasto vrenje
,
izboljšan prenos toplote
,
dielektrični fluidi
,
tanke kovinske folije
,
lasersko mikrostrukturiranje
,
površinske strukture
Projects
Funder:
ARRS - Slovenian Research Agency
Project number:
P2-0223
Name:
Prenos toplote in snovi
Funder:
ARRS - Slovenian Research Agency
Project number:
N2-0251
Name:
Izboljšanje procesa vrenja z uporabo teksturiranih površin (BEST)
Funder:
ARRS - Slovenian Research Agency
Project number:
J2-2486
Name:
Izboljšan prenos toplote pri vrenju z uporabo hierarhičnih funkcionaliziranih površin (eHEATs)
Funder:
Other - Other funder or multiple funders
Funding programme:
Fonds Wetenschappelijk Onderzoek – Vlaanderen, Onderzoeksproject
Project number:
G066722N
Funder:
Other - Other funder or multiple funders
Funding programme:
Fonds Wetenschappelijk Onderzoek – Vlaanderen, Medium-Scale Research Infrastructure
Project number:
I001120N
Acronym:
FemtoFac
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