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Drop coalescence on inclined plates in liquids

✍ Scribed by Dr.-Ing. Walter Meon; Prof. Dr.-Ing. Eckhart Blass

Publisher
John Wiley and Sons
Year
1991
Tongue
English
Weight
664 KB
Volume
14
Category
Article
ISSN
0930-7516

No coin nor oath required. For personal study only.

✦ Synopsis

Dedicated to Professor Kurt Dialer on the occasion of his 70th birthday

Inclined plates are often installed as mechanical separation aids in gravity settlers for the separation of liquid-liquid systems. The authors investigated the process of coalescence of single drops on trickling films flowing off inclined plates. The method of investigation was developed by Blass and Rautenberg. It ensures that, under certain conditions, only hydrodynamic parameters influence the coalescence process to any significant extent. The coalescence time of the drops characterizes the process of coalescence. Short times between 1 and 3 seconds provide favourable conditions for coalescence whereas long times, often ten times as long or even longer, are unfavourable. This contribution introduces a criterion for clear demarcation between these two ranges and also a determination of separation parameters for favourable conditions for coalescence. Furthermore, the function of the plates is described, which is determined by hydrodynamic and wetting processes. The characteristic operating regions of a plate are shown in a working diagram.

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