Influence of mass transfer on drop size distribution In an agitated liquid-liquid dispersion
Agata Maria Bąk , Wioletta Podgórska , Joanna Zenke , Edyta Leśniewska
AbstractTwo-phase toluene-water-acetone systems were discussed and the influence of rotational impeller speed (350 – 700 rpm) and acetone concentration (0.1 – 0.4 wt%) for experiments performed with and without impeller speed reduction were considered. Acetone was transferred from continuous aqueous phase to the toluene drops, therefore, drop coalescence was hampered due to generated Marangoni forces. Although for pure liquid-liquid systems without surface active agents the dynamic equilibrium between drop breakage and coalescence is achieved faster, the effect of mass transfer on transient Sauter diameters and drop size distributions is significant. For higher impeller speed and acetone concentration drop size decreased due to higher disruptive stresses and lower shape-restoring stresses proportional to the interfacial tension, which is decreasing function of acetone concentration.
The 22nd Polish Conference of Chemical and Process Engineering: Proceedings, 2016, Łódź, Faculty of Process and Environmental Engineering, ISBN 978-83-61997-75-7, 1584 p.
Proceedings OKIChiP 2016.pdf / No licence information (file archived - login or check accessibility on faculty)
|Keywords in Polish||transport masy, dyspersja, napięcie międzyfazowe, przepływ burzliwy|
|Keywords in English||mass transfer, dispersion, interfacial tension, turbulent flow|
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