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Titolo:
EFFECT OF SHEAR ON THE STRENGTH OF POLYMER-INDUCED FLOCS
Autore:
YEUNG A; GIBBS A; PELTON R;
Indirizzi:
MCMASTER UNIV,MCMASTER CTR PULP & PAPER RES,DEPT CHEM ENGN HAMILTON ON L8S 4L7 CANADA MCMASTER UNIV,MCMASTER CTR PULP & PAPER RES,DEPT CHEM ENGN HAMILTON ON L8S 4L7 CANADA
Titolo Testata:
Journal of colloid and interface science
fascicolo: 1, volume: 196, anno: 1997,
pagine: 113 - 115
SICI:
0021-9797(1997)196:1<113:EOSOTS>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
FLOCCULATION;
Keywords:
FLOCCULATION; FLUID SHEAR; FLOC STRENGTH; MICROMECHANICS; WATER-SOLUBLE POLYMER;
Tipo documento:
Article
Natura:
Periodico
Citazioni:
21
Recensione:
Indirizzi per estratti:
Citazione:
A. Yeung et al., "EFFECT OF SHEAR ON THE STRENGTH OF POLYMER-INDUCED FLOCS", Journal of colloid and interface science, 196(1), 1997, pp. 113-115

Abstract

Micromechanics was used to show that the rupture strength of polymer-induced flocs varied with the hydrodynamic conditions at which the flocs were formed, A maximum flee strength at an intermediate shear rate was observed, The overall performance of the polymeric flocculants, asdetermined by two independent methods, showed that the conditions foroptimal flocculation did not coincide with those for maximum flee strength. The amount of flocculation was explained in terms of the competing effects of the particle collision frequency and the destructive hydrodynamic forces, The contributing forces to the flee strength are, however, more likely to be densification of the flee by shear and the weakening of reattachment strengths, The evidence presented here may beuseful for explaining flocculation data that depart from the constantyield stress theory. Thus, the notion of the flee strength varying with shear rate may offer an alternative to multilevel flee structure models in the description of flocculation kinetics. (C) 1997 Academic Press.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 18/09/20 alle ore 20:05:43