Book ChapterDOI
Direct Contact Heat Transfer Between Immiscible Liquids
TLDR
In this paper, heat transfer to drops moving in a constant-temperature field and continuously varying temperature field is discussed, and three models are taken into account: rigid drop, completely mixed drop, and drop with internal circulation.Abstract:
Publisher Summary The basic characteristics of heat transfer between dispersed and continuous media are of both scientific and practical interest. The advantages of direct-contact heat transfer over the conventional processes using metallic transfer surfaces have lately stimulated research on its utilization for water desalination projects. Despite intensive efforts toward better understanding of transfer phenomena between drops and continuous media, accurate prediction of the transfer coefficients for a given system can as yet only be hoped for. Nevertheless, accumulated experience may provide an indication of the transfer mechanism to be encountered and the relevant coefficients may be estimated accordingly. This chapter discusses heat transfer to drops moving in a constant-temperature field and continuously varying temperature field. Heat is transferred to drops and bubbles with simultaneous phase change. While discussing about constant-temperature field, three models are taken into account: rigid drop, completely mixed drop, and drop with internal circulation. Work on direct-contact heat exchangers was stimulated earlier by the quest for economic water-desalination units. Multiphase exchange, where latent heat is transferred among the immiscible fluids, has been effectively used in direct-contact freezing units in which a dispersed volatile fluid evaporates in the saline water with simultaneous freezing of part of the water.read more
Citations
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Journal ArticleDOI
The Effect of Heat Exchange Fluid Composition on the Performance of a Liquid Nitrogen Engine System
TL;DR: In this paper, a detailed experimental investigation on the performance of a novel, HEF enhanced liquid nitrogen (LN2) engine system was carried out to investigate the impact of different HEF compositions on engine performance under different LN2 temperatures, N2 inlet conditions and engine speeds.
ReportDOI
Potential heat exchange fluids for use in sulfuric acid vaporizers
D. D. Lawson,G. R. Petersen +1 more
TL;DR: In this paper, a series of perhalocarbons are proposed as candidate heat exchange fluids for service in thermochemical cycles for hydrogen production that involve direct contact of the fluid with sulfuric acid and vaporization of the acid.
References
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Journal ArticleDOI
The mechanics of large bubbles rising through extended liquids and through liquids in tubes
TL;DR: In this article, the authors describe measurements of the shape and rate of rise of air bubbles varying in volume from 1·5 to 200 cm. 3 when they rise through nitrobenzene or water.
Journal ArticleDOI
The motion of bubbles in a vertical temperature gradient
TL;DR: In this article, it has been demonstrated that small bubbles in pure liquids can be held stationary or driven downwards by means of a sufficiently strong negative temperature gradient in the vertical direction, due to the stresses resulting from the thermal variation of surface tension at the bubble surface.
Related Papers (5)
Direct-contact heat transfer with change of phase: Evaporation of drops in an immiscible liquid medium
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Direct contact heat transfer with change of phase: Spray‐column studies of a three‐phase heat exchanger
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