IR measurements of heat transfer coefficients and nucleation parameters during saturated nucleate boiling of water–glycerin mixtures

Vajc, Viktor (author), Može, Matic (author), Zupančič, Matevž (author), Šulc, Radek (author), Golobič, Iztok (author)

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
• UDC: 544.3/.4:66.02
• ISSN on article: 2214-157X
• DOI: 10.1016/j.csite.2022.101917
• COBISS.SI-ID: 100823555
• Publication date in RUL: 14.03.2022

Record is a part of a journal

• Title: Case studies in thermal engineering
• Publisher: Elsevier
• ISSN: 2214-157X
• COBISS.SI-ID: 519660057

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