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Gravity settling in liquid/liquid dispersions
Author(s) -
Kumar Arun,
Hartland Stanley
Publication year - 1985
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.5450630303
Subject(s) - settling , liquid liquid , drop (telecommunication) , reynolds number , mechanics , slip (aerodynamics) , materials science , thermodynamics , chemistry , chromatography , physics , engineering , mechanical engineering , turbulence
An empirical expression for the prediction of dispersed phase hold‐up and slip velocity in droplet dispersions settling under gravity is presented. Analysis of 998 published experimental results for 29 liquid/liquid systems from 14 different data sources shows that the slip velocity of the drop swarm is given in terms of drop diameter and physical properties of the system by:\documentclass{article}\pagestyle{empty}\begin{document}$$ 4dg\Delta \rho \left({1 - \varepsilon} \right)/\left\{{3\rho _c V_s^2 \left({1 + 4.56\varepsilon ^{0.73}} \right)} \right\} = 0.53 + 24\mu _c /\left({dV_s \rho _c} \right) $$\end{document}Good agreement between experimental and predicted values of slip velocity is obtained over a wide range of hold‐up (0.01 to 0.76) and Reynolds number (0.16 to 3169).