Abstract
This paper describes how a fluid mechanism provides a new method for the separation of drops and particles from the type of dilute suspension common in biochemical processes.
Lateral migration is a low Reynolds number fluid phenomenon observed in laminar duct flow. The mechanism causes the dispersed phase of drops or particles to migrate across flow streamlines to a characteristic equilibrium position. This paper considers only the behaviour of single particles. The equilibrium streamline is dependent on the settling velocity of the dispersed phase, the bulk velocity and the ratio of particle diameter to channel height. Preliminary results, using a scaled-up channel, are presented.
The technique is particularly attractive for the continuous separation of dilute suspensions of droplets and particles ≥50 μm with very low settling terminal velocities and which may be shear sensitive. This type of separation is not effectively fulfilled by continuous centrifuges. The proposed system is both easily and cheaply constructed and since it has no moving mechanical parts is ideally suited to operation behind containment or in aseptic conditions as required by the biotechnology industry.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Bretherton, F.P; Slow viscous flow round a cylinder in a simple shear. J. Fluid Mech. 1962, 12, 591–613
.Cox, R.G. and Brenner, H; The lateral migration of solid particles in Poiseuille flow -I. Chem. Eng. Sci. 1968, 23,147–173
.Cox, R.G. and Hsu, S.K; The lateral migration of solid particles in a laminar flow near a plane. Int. J. Multiphase Flow 1977, 3,201–222
Denson, C.D; Particle migration in shear fields. PhD thesis. Univ. Utah, Salt Lake City, Utah, 1965
.Goldman, A.J., Cox, R.G. and Brenner, H; Slow viscous motion of a sphere parallel to a plane wall-I Motion through a quiescent fluid. Chem. Eng. Sci. 1967,22,637–651
.Goldsmith, H.L. and Mason, S.G; The flow of suspensions through tubes. J. Colloid Sci. 1962, 17,448–476
.Halow, J.S. Radial migration of solid spheres in Couette systems. PhD. thesis, Virginia Polytechnic Inst, Blacksburg, Va., 1967
Happel, J. and Brenner, H; Low Reynolds number hydrodynamics. Noordhoff Pub., 1973.
.Hiller, W. and Kowalewski, T.A; An experimental study of the lateral migration of a droplet in a creeping flow. Exp. in Fluids 1987,5,43–48
.Ho, B.P. and Leal, L.G; Inertial migration of rigid spheres in two-dimensional unidirectional flows. J. Fluid Mech. 1974,65, 2,365–400
ssJeffrey, R.C. and Pearson, J.R.A; Particle motion in laminar vertical tube flow. J. Fluid Mech. 1965, 22, 4,721–735
Karnis, A. and Mason, S.G; Particle motions in sheared suspensions. XIII. Wall migration of fluid drops. J. Colloid Interface Sci. 1967, 24, 164–169
Leal, L.G; Particle motions in a viscous fluid. Ann. Rev. Fluid Mech. 1980,12, 435–476
Majumbar, A. and Graham, A.L; Experimental study on the solid particle dynamics in shear flow. Powder Tech. 1987,49,217–226
Mctigue, D.F, Givler, R.C. and Nunziato, J.W; J. Rheology 1986,30,5,1053–1076
.Oliver, D.R; Influence of particle rotation on radial migration in the Poiseuille flow of suspensions. Nature 1962,194,1269–1271,1962
Purdom, G.J.; Lateral migration of single rigid buoyant and neutrally buoyant in two dimension Poiseuille flow. PhD thesis. Imperial College, London, 1990
.Rakow, A.L. and Chappell, M.L; Axial migration of spirulina microalgae in laminar tube flow. Biorheology 1987,24,763–768
.Repetti, R.V. and Leonard, E.F; Segre-Silberberg annulus formation: a possible explanation. Nature 1964,203,1346–1348
.Segre, G. and Silberberg, A; Behaviour of macroscopic rigid spheres in Poiseuille flow. Part! Experimental results and interpretation. J. Fluid Mech. 1962, 18, 312–317
.Small, H; Hydrodynamic chromatography: A technique for size analysis of colloidal particles. J. Colloid Interface Sci. 1974,48, 1,147–161
.Tachibana, M; On the behaviour of a sphere in the laminar tube flows. Rheol. Acta 1973, 12,58–69
.Vasseur, P. and Cox, R.G; The lateral migration of a spherical particle in two-dimensional shear flows. J. Fluid Mech. 1976,78, 2,385–413
Yanizeski, G.M; Phenomenological characteristics of the laminar flow of neutrally buoyant particles in a rectangular of high aspect ratio. PhD thesis. Carnegie-Mellon Univ., Michigan, 1968
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1990 United Kingdom Atomic Energy Authority
About this chapter
Cite this chapter
Purdom, G.J., Lambe, C.A. (1990). Lateral Migration: A laminar fluid flow mechanism suited to Biotechnology separations. In: Pyle, D.L. (eds) Separations for Biotechnology 2. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0783-6_10
Download citation
DOI: https://doi.org/10.1007/978-94-009-0783-6_10
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-6839-0
Online ISBN: 978-94-009-0783-6
eBook Packages: Springer Book Archive