Influence of poly(vinyl alcohol) molecular weight on drop coalescence and breakage rate
Agata Maria Bąk , Wioletta Podgórska
AbstractThe influence of poly(vinyl alcohol), PVA, molecular weight on drop breakage and coalescence in stirred liquid-liquid dispersion was considered. Three types of PVA of the same degree of hydrolysis 88% and different molecular weight in the range 13,000-186,000 were used in experiments. Molecular weight affects steric forces, interfacial tension and surface viscosity, which all have an influence on drop size distribution. PVA of lower molecular weight reduces the interfacial tension more effectively while the adsorption of high molecular weight PVA is slower and more complicated. Drop interfaces can remain partially mobile for polymer concentration as small as 0.001 wt% or they can be significantly immobilized for PVA concentration c 0.002 wt%. Drop size distributions were predicted using multifractal breakage and coalescence models. Lost of stabilizing properties of PVA of highest molecular weight at high impeller speed was observed which can be explained by unfavourable molecule conformation in such conditions.
|Journal series||Chemical Engineering Research & Design, ISSN 0263-8762|
|Publication size in sheets||0.6|
|Conference||15th European Conference on Mixing, 28-06-2015 - 03-07-2015, Saint-Petersburg, Rosja|
|Keywords in Polish||poli(alkohol winylowy), rozkład wielkości kropel, napięcie międzyfazowe, równanie bilansu populacji, model multifraktalny rozpadu, model multifraktalny koalescencji|
|Keywords in English||poly(vinyl alcohol), drop size distribution, interfacial tension, population balance equation, multifractal breakage model, multifractal coalescence model|
|Score|| = 30.0, 28-11-2017, ArticleFromJournalAndMatConfByIndicator|
= 30.0, 28-11-2017, ArticleFromJournalAndMatConfByIndicator
|Publication indicators||: 2016 = 2.538 (2) - 2016=2.82 (5)|
|Uwagi||Volume 108 Special Issue edited by Bałdyga Jerzy Robert, Kresta Suzanne, Line Alain, Abiev Rufat|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.