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Studies of the critical heat‐flux for some binary mixtures and their components
Author(s) -
Carne M.
Publication year - 1963
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.5450410602
Subject(s) - subcooling , thermodynamics , boiling , heat flux , convection , forced convection , critical heat flux , nucleate boiling , chemistry , materials science , heat transfer , physics
A pool boiler and a forced convection loop used for studying critical heat fluxes in binary mixtures are described. The geometry of the test element is shown to be an important variable in pool boiling experiments, affecting both absolute flux values and the variation with composition. Data given for AC and DC power supplies show that the critical heat flux is relatively unaffected by the power supply source. Empirical equations of the form ( Q/A ) c = const. V a Δ T b sub are given for benzene, toluene and acetone, which correlate the forced convection subcooled data with average deviations of 3.1%, 5.0% and 5.1% respectively. Forced convection subcooled data are given for the systems benzene‐toluene and acetone‐toluene showing the effect of composition on critical heat flux. It is concluded that, at forced convection subcooled conditions in certain concentration ranges, binary mixtures may exhibit critical heat fluxes which are higher than for either of the pure components. In this respect loop experiments are analogous to pool boiling ones. However, extrapolation from pool boiling experiments to loop conditions does not appear to be feasible under the present test conditions.