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Statements

Subject Item
n2:RIV%2F61389013%3A_____%2F14%3A00428566%21RIV15-GA0-61389013
rdf:type
skos:Concept n8:Vysledek
dcterms:description
The contribution summarizes recent results of description of the flow induced coalescence in immiscible polymer blends and addresses problems that call for which solving. The theory of coalescence based on the switch between equations for matrix drainage between spherical or deformed droplets provides a good agreement with more complicated modeling and available experimental data for probability, Pc, that the collision of droplets will be followed by their fusion. A new equation for description of the matrix drainage between deformed droplets, applicable to the whole range of viscosity ratios, p, of the droplets and matrixes, is proposed. The theory facilitates to consider the effect of the matrix elasticity on coalescence. Pc decreases with the matrix relaxation time but this decrease is not pronounced for relaxation times typical of most commercial polymers. Modeling of the flow induced coalescence in concentrated systems is needed for prediction of the dependence of coalescence rate on volume fraction of droplets. The effect of the droplet anisometry on Pc should be studied for better understanding the coalescence in flow field with high and moderate deformation rates. A reliable description of coalescence in mixing and processing devices requires proper modeling of complex flow fields. The contribution summarizes recent results of description of the flow induced coalescence in immiscible polymer blends and addresses problems that call for which solving. The theory of coalescence based on the switch between equations for matrix drainage between spherical or deformed droplets provides a good agreement with more complicated modeling and available experimental data for probability, Pc, that the collision of droplets will be followed by their fusion. A new equation for description of the matrix drainage between deformed droplets, applicable to the whole range of viscosity ratios, p, of the droplets and matrixes, is proposed. The theory facilitates to consider the effect of the matrix elasticity on coalescence. Pc decreases with the matrix relaxation time but this decrease is not pronounced for relaxation times typical of most commercial polymers. Modeling of the flow induced coalescence in concentrated systems is needed for prediction of the dependence of coalescence rate on volume fraction of droplets. The effect of the droplet anisometry on Pc should be studied for better understanding the coalescence in flow field with high and moderate deformation rates. A reliable description of coalescence in mixing and processing devices requires proper modeling of complex flow fields.
dcterms:title
Recent results and persisting problems in modeling flow induced coalescence Recent results and persisting problems in modeling flow induced coalescence
skos:prefLabel
Recent results and persisting problems in modeling flow induced coalescence Recent results and persisting problems in modeling flow induced coalescence
skos:notation
RIV/61389013:_____/14:00428566!RIV15-GA0-61389013
n3:aktivita
n17:P n17:I
n3:aktivity
I, P(GAP106/11/1069)
n3:dodaniDat
n5:2015
n3:domaciTvurceVysledku
n15:4483456 n15:1361503
n3:druhVysledku
n11:D
n3:duvernostUdaju
n19:S
n3:entitaPredkladatele
n9:predkladatel
n3:idSjednocenehoVysledku
41554
n3:idVysledku
RIV/61389013:_____/14:00428566
n3:jazykVysledku
n12:eng
n3:klicovaSlova
flow induced coalescence; polymer blends; viscoelasticity
n3:klicoveSlovo
n6:flow%20induced%20coalescence n6:polymer%20blends n6:viscoelasticity
n3:kontrolniKodProRIV
[316648F7DE46]
n3:mistoKonaniAkce
Nuremberg
n3:mistoVydani
Melville
n3:nazevZdroje
AIP Conference Proceedings
n3:obor
n20:BK
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
2
n3:projekt
n10:GAP106%2F11%2F1069
n3:rokUplatneniVysledku
n5:2014
n3:tvurceVysledku
Fortelný, Ivan Jůza, Josef
n3:typAkce
n14:WRD
n3:wos
000341414900138
n3:zahajeniAkce
2013-07-15+02:00
s:issn
0094-243X
s:numberOfPages
4
n16:doi
10.1063/1.4873862
n18:hasPublisher
American Institute of Physics