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The creeping motion of multiple spherical liquid drops

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Abstract

This paper deals with the drag factor of the multiple spherical liquid drops in the creeping motion by means of the Sampson singularities and collocation technique. The drag factors of the drops are calculated under distinct conditions: different number of liquid drops in the chain and different sphere spacing. From the results the influence of the viscosity ratio on the shielding effect and end effect are revealed. The convergence of the method is also studied in this paper.

In this paper the collocation technique developed by Gluckman et al. in treating the rigid sphere case is applied to deal with the creeping motion of multiple spherical liquid drops which has improtant applications in bioengineering and chemical engineering. Writing the general solutions in inner and outer regions of the spheres and satisfying the kinematic and dynamic matching conditions at the collocation points on the interfaces, a set of linear algebraic equations is obtained to determine the unknown coefficients in the solutions. By means of any matrix inversion technique the approximate solutions are presented. In the first section of this paper the mathematic formulation of the problem is given and then in the second section the numerical results are introduced and analysed.

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References

  1. Gluckman, M. J., R. Pfeffer and S. Weinbaum, A new technique for treating multiparticle slow viscous flow: axcsymmetcis flow past spheres and spheroids,J. Fluid Mech.,50 (1971), 705–740

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  2. Happel, J and H. Brenner,Low Reynolds Number Hydrodynamics, Prentice-Hall, New York (1965).

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Wang-yi, W., Bai-wen, Z. The creeping motion of multiple spherical liquid drops. Appl Math Mech 6, 131–139 (1985). https://doi.org/10.1007/BF01874951

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