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IR measurements of heat transfer coefficients and nucleation parameters during saturated nucleate boiling of water–glycerin mixtures
ID Vajc, Viktor (Author), ID Može, Matic (Author), ID Zupančič, Matevž (Author), ID Šulc, Radek (Author), ID Golobič, Iztok (Author)

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Abstract
Heat transfer coefficients and nucleation parameters were experimentally measured during saturated nucleate boiling of water–glycerin mixtures on a thin smooth titanium foil. Infrared thermometry was employed to study boiling of water–glycerin mixtures at atmospheric pressure in water mass fraction range from 100 % down to 60 % and heat flux range from 0 to 200 kW m−2. Heat transfer coefficients were found to deteriorate with an increase of concentration of glycerin in the boiling mixture. The deterioration was more pronounced for mixtures with lower water mass fraction and for higher heat fluxes. Bubble departure diameters were observed to be weakly dependent on heat flux and independent of composition of the boiling mixture. Nucleation frequencies were found to increase with heat flux and to be inversely proportional to water mass fraction of the boiling mixture. Thermal energy transferred during nucleation of individual bubbles was independent of both heat flux and mixture composition. Values and trends of evaluated parameters suggest that for investigated mixtures and boiling conditions, heat transfer into the liquid phase is more important relative to the transport of latent heat by nucleating bubbles.

Language:English
Keywords:nucleate boiling, pool boiling, heat transfer coefficient, water–glycerin mixtures, bubble departure diameter, nucleation frequency, bubble growth rate, infrared thermometry, titanium foil
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Publication status:Published
Publication version:Version of Record
Year:2022
Number of pages:13 str.
Numbering:Vol. 32, art. 101917
PID:20.500.12556/RUL-135431 This link opens in a new window
UDC:544.3/.4:66.02
ISSN on article:2214-157X
DOI:10.1016/j.csite.2022.101917 This link opens in a new window
COBISS.SI-ID:100823555 This link opens in a new window
Publication date in RUL:14.03.2022
Views:586
Downloads:109
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Record is a part of a journal

Title:Case studies in thermal engineering
Publisher:Elsevier
ISSN:2214-157X
COBISS.SI-ID:519660057 This link opens in a new window

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:05.03.2022
Applies to:Available online

Secondary language

Language:Slovenian
Keywords:mehurčkasto vrenje, vrenje v bazenu, koeficient toplotne prestopnosti, zmes voda-glicerin, premer mehurčka, frekvenca nukleacije, rast mehurčka, infrardeča termografija, titanova folija

Projects

Funder:Other - Other funder or multiple funders
Funding programme:Ministry of Education, Youth and Sports of the Czech Republic
Project number:CZ.02.1.01/0.0/0.0/16_019/0000753
Name:Research centre for low-carbon energy technologies

Funder:Other - Other funder or multiple funders
Funding programme:Grant Agency of the Czech Technical University in Prague
Project number:SGS20/119/OHK2/2T/12
Name:Transport Phenomena in Multiphase Systems

Funder:ARRS - Slovenian Research Agency
Project number:P2-0223
Name:Prenos toplote in snovi

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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