Influence of poly(vinyl alcohol) molecular weight on drop coalescence and breakage rate

Agata Maria Bąk , Wioletta Podgórska


The 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.
Author Agata Maria Bąk (FCPE / DCRED)
Agata Maria Bąk,,
- Department of Chemical Reactor Engineering and Dynamics
, Wioletta Podgórska (FCPE / DCRED)
Wioletta Podgórska,,
- Department of Chemical Reactor Engineering and Dynamics
Journal seriesChemical Engineering Research & Design, ISSN 0263-8762
Issue year2016
Publication size in sheets0.6
Conference15th European Conference on Mixing, 28-06-2015 - 03-07-2015, Saint-Petersburg, Rosja
Keywords in Polishpoli(alkohol winylowy), rozkład wielkości kropel, napięcie międzyfazowe, równanie bilansu populacji, model multifraktalny rozpadu, model multifraktalny koalescencji
Keywords in Englishpoly(vinyl alcohol), drop size distribution, interfacial tension, population balance equation, multifractal breakage model, multifractal coalescence model
ASJC Classification1500 General Chemical Engineering; 1600 General Chemistry
Languageen angielski
Bąk A.M., Podgórska W. - Influence of poly(vinyl alcohol)....pdf 2.09 MB
Score (nominal)30
ScoreMinisterial score = 30.0, 05-09-2019, ArticleFromJournalAndMatConfByIndicator
Ministerial score (2013-2016) = 30.0, 05-09-2019, ArticleFromJournalAndMatConfByIndicator
Publication indicators WoS Citations = 3; Scopus SNIP (Source Normalised Impact per Paper): 2016 = 1.303; WoS Impact Factor: 2016 = 2.538 (2) - 2016=2.82 (5)
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UwagiVolume 108 Special Issue edited by Bałdyga Jerzy Robert, Kresta Suzanne, Line Alain, Abiev Rufat
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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