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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Longitudinal dispersion in two-phase continuous-flow operations: solution and tables for cocurrent flow
TL;DR: In this article, the mathematical derivation of solutions for longitudinal dispersion in chemical-process equipment is extended to the case of cocurrent flow and the extent of completion of the process, in dimensionless form, is given as an analytical function of rates of dispersion.
Journal ArticleDOI
Investigation of flow and temperature patterns in direct contact condensation using PIV, PLIF and CFD
TL;DR: In this paper, the authors used Particle Image Velocimetry (PIV) and Planar Laser Induced Fluorescence (PLIF) to measure the velocity and temperature of steam injected centrally at the bottom of a vertical rectangular water vessel.
Journal ArticleDOI
Gas‐Liquid Direct‐Contact Evaporation: A Review
TL;DR: In this paper, a review of the literature regarding gas-liquid direct contact evaporators is presented, addressing classic and potential applications, bubble regimes, gas holdup and bubble size distributions, as well as mathematical models proposed for simulating the unit.
Book ChapterDOI
Direct Contact Condensation
TL;DR: Direct contact condensation (DCC) as mentioned in this paper is used in many chemical process industries, usually for quenching and partial or total condensation, particularly when corrosive vapors are involved.
Simulation of heat and mass transfer in spray drying
TL;DR: In this article, a survey of heat and mass transfer around droplets in spray dryers and the diffusional transport inside them is given, which includes variable diffusion coefficients in the drying liquid and swelling or shrinking of droplets.
References
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Journal ArticleDOI
Gas absorption by single drops during formation
H. Groothuis,H. Kramers +1 more
TL;DR: In this paper, the amount of SO 2 absorbed by individual drops of water and of several hydrocarbons has been measured continuously during their formation at the tip of a capillary tube.
Journal ArticleDOI
Turbulent heat and mass transfer from stationary particles
I. S. Pasternak,W. H. Gauvin +1 more
TL;DR: In this paper, the authors measured convective heat and mass transfer rates for 20 shapes suspended in various orientations in a hot turbulent air stream and correlated the data for different shapes available in the literature.
Journal ArticleDOI
Drop formation in liquid‐liquid systems from single nozzles
Harold R. Null,Homer F. Johnson +1 more
TL;DR: In this article, a new correlation was presented which predicts volumes of drops formed from single nozzles to within 20% throughout the range of nozzle flow rates for which uniform drop sizes are obtained.
Journal ArticleDOI
Heat transfer from the surface of a steam bubble in turbulent subcooled liquid stream
S. G. Bankoff,J. P. Mason +1 more
TL;DR: In this paper, the authors measured the surface heat transfer coefficients at the surface of single bubbles formed by injecting steam into a subcooled water stream at atmospheric pressure, and the bubble frequencies were in the range 200 to 2,500 cycles/sec.
Journal ArticleDOI
Mass transfer from circulating liquid drops
F. H. Garner,A. Foord,M. Tayeban +2 more
TL;DR: In this article, mass transfer coefficients for partially miscible binary liquid-liquid systems have been measured from single drops, and the results are higher than those from spray columns and appear to represent the maximum mass-transfer rates obtainable from droplets in free motion.
Related Papers (5)
Direct-contact heat transfer with change of phase: Evaporation of drops in an immiscible liquid medium
Samuel Sideman,Yehuda Taitel +1 more
Direct contact heat transfer with change of phase: Spray‐column studies of a three‐phase heat exchanger
Samuel Sideman,Yehuda Gat +1 more