Download A Physical Introduction to Suspension Dynamics by Élisabeth Guazzelli, Jeffrey F. Morris, Sylvie Pic PDF

By Élisabeth Guazzelli, Jeffrey F. Morris, Sylvie Pic

Figuring out the habit of debris suspended in a fluid has many very important functions throughout more than a few fields, together with engineering and geophysics. Comprising major elements, this booklet starts with the well-developed conception of debris in viscous fluids, i.e. microhydrodynamics, quite for unmarried- and pair-body dynamics. half II considers many-body dynamics, overlaying shear flows and sedimentation, bulk circulation homes and collective phenomena. An interlude among the 2 elements offers the elemental statistical ideas had to hire the result of the 1st (microscopic) within the moment (macroscopic). The authors introduce theoretical, mathematical ideas via concrete examples, making the cloth available to non-mathematicians. in addition they contain the various many open questions within the box to inspire extra examine. for this reason, this can be an awesome creation for college kids and researchers from different disciplines who're drawing close suspension dynamics for the 1st time.

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Additional resources for A Physical Introduction to Suspension Dynamics

Example text

This is excluded by the boundary conditions and therefore u(1) = u(2) . Using the homogeneous Stokes equations, one also finds that the difference pressure p(1) − p(2) is a constant. The Stokes flow is therefore unique. e. having the same boundaries but different boundary conditions. Here the results are presented in a general and rather abstract form, which is not our preferred approach. The utility in most considerations in this book will be to cases in which at least some part of the boundary is a particle surface, allowing us to determine properties of one flow about the body based upon another known solution.

5 Sphere fixed in a strain field. A scalar pressure linear in the rate of strain may be constructed using ∞ the form p(x) = λ1 xi Eij xj f (r). We see that the second-rank decaying harmonic contains the form xi xj f (r), and the pressure is thus ∞ p(x) ∝ Eij δij xi xj −3 5 . 3 r r ∞ ∞ However, because δij Eij = Eii = ∇·u∞ = 0, the leading term involving δij does not contribute and the pressure may, in fact, be written p(x) = λ1 ∞ xi Eij xj , 5 r where we have absorbed the factor −3 into the unknown coefficient λ1 .

7 Sphere and spherical surface at infinity. where σ (−2) indicates those terms in the fluid stress decaying as r −2 . If we choose the surface at infinity to be that of a sphere of radius R → ∞, we can replace the complete stress by the dominant stress decaying as R−2 . The integral of the higher order terms over this surface goes to zero as R → ∞ while the dominant R−2 term is balanced by the growth of the surface going as R2 to yield a finite drag. 29) yields the Stokes drag law we have presented previously.

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