1977
DOI: 10.1002/aic.690230306
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Use of trajectory analysis to study stability of colloidal dispersions in flow fields

Abstract: Trajectories have been computed for two equal sized spherical particles in simple laminar shearing and in uniaxial extensional flows. Effects of interparticle attraction, electrostatic repulsion, and hydrodynamics were included. The results are pertinent to questions of colloidal stability under various conditions of flow. Particulate dispersions can react in several different ways as the intensity of shearing is increased from zero: the dispersion can remain stable; it can be redispersed, if it had been initi… Show more

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Cited by 202 publications
(182 citation statements)
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“…In fact, because interparticle forces are so important in flocculation processes, stability results similar to those displayed in Fig. 3 are also found in shear-induced flocculation (5,7). That is, lyophobic colloids can be unstable at low and high shear rates, but stable against shear-induced flocculation at intermediate rates.…”
Section: (G(r) }supporting
confidence: 66%
See 1 more Smart Citation
“…In fact, because interparticle forces are so important in flocculation processes, stability results similar to those displayed in Fig. 3 are also found in shear-induced flocculation (5,7). That is, lyophobic colloids can be unstable at low and high shear rates, but stable against shear-induced flocculation at intermediate rates.…”
Section: (G(r) }supporting
confidence: 66%
“…[1][2][3][4][5][6][7][8][9][10], there has been no analogous study of particle/particle aggregation due to sedimentation (gravity-induced) flocculation in polydisperse colloidal systems. Gravity-induced flocculation arises from the differential creaming rates between large and small particles.…”
Section: Introductionmentioning
confidence: 99%
“…characterizing aerosol stability as a function of flow type, have been carried out previously in the context of steady laminar flows (Zeichner & Schowalter 1977;Feke & Schowalter 1983), laminar chaotic flows (Bidkar & Khakhar 1990) and for a homogeneous stationary isotropic turbulence flow field (Brunk, Koch & Lion 1998). It has been found in these calculations that the neglect of hydrodynamic interactions usually leads to significant over-predictions of coagulation efficiency (Brunk et al 1998).…”
Section: Conclusion and Discussionmentioning
confidence: 99%
“…On the other hand, JV^remains constant since it is independent of external force, as seen in Eq. (13). For interpretation of the results in the stability plane, consider a situation in which doublets are present in a suspension for NR= 104 as in Fig.…”
Section: Stability Of Colloidal Particlesmentioning
confidence: 99%