Particle motions in sheared suspensions XX: Circular cylinders

Authors

  • C. L. Darabaner,

    1. Physical Chemistry Division, Pulp and Paper Research Institute of Canada and Department of Chemistry, McGill University, Montreal, Que.
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  • J. K. Raasch,

    1. Physical Chemistry Division, Pulp and Paper Research Institute of Canada and Department of Chemistry, McGill University, Montreal, Que.
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  • S. G. Mason

    1. Physical Chemistry Division, Pulp and Paper Research Institute of Canada and Department of Chemistry, McGill University, Montreal, Que.
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Abstract

The behavior of rigid circular cylinders suspended vertically in viscous fluids in laminar shear flow was found to compare favorably with a theory for infinitely long cylinders which we have extended to include interactions between two cylinders of different diameters. A description of the versatile Couette apparatus in which most of the experiments were performed is included. Observations were made on single cylinders at various distances from the wall bounding flow, on collisions between cylinders of both equal and unequal diameters and on interactions between a cylinder and a sphere. Collision doublets were found to be either permanent or separating, depending on the initial orientations and separations of the particles. The behavior of these particles is analogous to that of spheres in Couette flow.

Abstract

On a trouvé que le comportement de cylindrea circulaires et rigides en suspension verticale dans des fluides visqueux, dans un écoulement laminaire à cisaillement, se comparaǐt favorablement avec les données ďune théorie relative aux cylindres infiniment longs qui, par extension s'appliquent aussi aux réactions entre deux paramètres de diametrès diffèrents.On décrit ľappareil versatile Couette, lequel a servi à la plupart des expériences. On a fait des observations sur des cylindres simples à diverses distances de ľécoulement voisin de la paroi, sur des collisions entre cylindres de diamètres égaux et inégaux et sur les réactions entre un cylindre et une sphère. On a trouvé que les “doublets” de collision étaient soit permanents ou tendaient à se séparer, selon ľorientation initiale des particules. Le comportement de ces particules est analogue à celui des sphères dans ľécoulement Couette.

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