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

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

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.

Keywords

mehurčkasto vrenje;vrenje v bazenu;koeficient toplotne prestopnosti;zmes voda-glicerin;premer mehurčka;frekvenca nukleacije;rast mehurčka;infrardeča termografija;titanova folija;nucleate boiling;pool boiling;heat transfer coefficient;water–glycerin mixtures;bubble departure diameter;nucleation frequency;bubble growth rate;infrared thermometry;titanium foil;

Data

Language:	English
Year of publishing:	2022
Typology:	1.01 - Original Scientific Article
Organization:	UL FS - Faculty of Mechanical Engineering
UDC:	544.3/.4:66.02
COBISS:	100823555
ISSN:	2214-157X
Views:	465
Downloads:	87
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	Slovenian
Secondary keywords:	mehurčkasto vrenje;vrenje v bazenu;koeficient toplotne prestopnosti;zmes voda-glicerin;premer mehurčka;frekvenca nukleacije;rast mehurčka;infrardeča termografija;titanova folija;
Type (COBISS):	Article
Pages:	str. 1-13
Issue:	ǂVol. ǂ32
Chronology:	Apr. 2022
DOI:	10.1016/j.csite.2022.101917
ID:	14751397