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

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

Povzetek

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.

Ključne besede

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;

Podatki

Jezik:	Angleški jezik
Leto izida:	2022
Tipologija:	1.01 - Izvirni znanstveni članek
Organizacija:	UL FS - Fakulteta za strojništvo
UDK:	544.3/.4:66.02
COBISS:	100823555
ISSN:	2214-157X
Št. ogledov:	465
Št. prenosov:	87
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Slovenski jezik
Sekundarne ključne besede:	mehurčkasto vrenje;vrenje v bazenu;koeficient toplotne prestopnosti;zmes voda-glicerin;premer mehurčka;frekvenca nukleacije;rast mehurčka;infrardeča termografija;titanova folija;
Vrsta dela (COBISS):	Članek v reviji
Strani:	str. 1-13
Zvezek:	ǂVol. ǂ32
Čas izdaje:	Apr. 2022
DOI:	10.1016/j.csite.2022.101917
ID:	14751397