The characteristics of steady pool boiling heat transfer from a horizontal wire to various emulsions were obtained experimentally. Sample emulsions were prepared by an ultrasonic method with water, oils whose boiling points are higher than that of water, and emulsifying agents. The kind of emulsifying agent affected remarkably the characteristics of heat transfer to oil-in-water emulsions. The kind of oil affected little the heat transfer to oil-in-water emulsions but strongly that to water-in-oil emulsions.
The characteristics of the augmentation technique previously proposed by the authors has been studied experimentally with water drops 3.9 to 5.9 mm in diameter rising in methylphenyl silicone oil. Each drop is subjected to an intermittent electric field applied periodically perpendicular to its trajectory, and the drop responds by periodic elongation in the direction of the field. The dependence of heat transfer coefficient on the strength, frequency and duty ratio of the field is presented and discussed.
An air bubble that passes through a horizontal interface from a lower layer of Freon‐113 to an upper layer of aqueous glycerol forms a two‐phase bubble in the upper layer as a result of entrainment of a certain volume of Freon‐113 from the lower layer. The volume of entrained Freon‐113 and the rise velocity of such a two‐phase bubble have been measured. The former increases with an increase of the bubble size irrespective of the viscosity of the upper liquid. The latter is somewhat lower than that of a normal air bubble of the same size.
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