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Nucleation site density in pool boiling of binary mixtures: Effect of surface micro‐roughness and surface and liquid physical properties
Author(s) -
Benjamin R. J.,
Balakrishnan A. R.
Publication year - 1997
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450750611
Subject(s) - nucleation , surface roughness , boiling , materials science , thermodynamics , ionic liquid , surface finish , surface (topology) , analytical chemistry (journal) , chemistry , chromatography , composite material , organic chemistry , physics , geometry , mathematics , catalysis
The nucleation site density (N/A) during pool boiling of binary mixtures has been experimentally examined in terms of the heating surface physical properties, the liquid physical properties, the vapour liquid equilibria and the surface micro‐roughness. The liquid mixtures used were acetone ‐ carbon tetrachloride and n‐hexane ‐ carbon tetrachloride. A parameter R a , to characterize the micro‐roughness of the heating surface was defined as the average value of the peaks and valleys on the surface. The study shows that while at low R a , values the physical properties of the liquid and the binary composition are not as important as the surface roughness; at higher R a values the liquid properties and composition are also important. A correlation based on the present data has been proposed.