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ISSN Online: 2377-424X

ISBN Print: 0-89116-299-2

International Heat Transfer Conference 7
September, 6-10, 1982, Munich, Germany

EFFECT OF C0MP0SIT0N ON BOILING INCIPIENT SUPERHEATS IN BINARY LIQUID MIXTURES

Get access (open in a dialog) DOI: 10.1615/IHTC7.3830
pages 95-100

Sinopsis

The effect of liquid mixture mole fraction on boiling incipience and boiling site deactivation have been investigated experimentally. In experiments with liquid nitrogen-argon mixtures a single boiling site was activated and deactivated and no change in the incipient superheat with composition was found. The deactivation superheats coincided in value with the incipient superheats. Ethanol-water experiments showed a maximum incipient superheat of 44 K compared to the pure water and ethanol values of 7 and 23 K, respectively. The deactivation superheat of the last boiling site was much smaller than the incipient superheat but was still higher in the mixtures than in the single components, water and ethanol. The variation in the dynamic contact angle with composition was a dominant factor affecting the incipient superheat.