Hydrodynamic Interactions in Some Unsteady Viscous Flows

Abstract

As we have seen in the previous chapters, the inclusion of unsteadiness in viscous flow can produce some unusual phenomena, completely at variance with those which arise normally in the steady case. An important class of unsteady fluid flows are those in which a body starts to move from rest either impulsively or with acceleration in a viscous fluid. Another class unsteady fluid flows are the oscillating viscous flows. An increasing interest towards their study is noticed in the recent years. This is connected with the fact, that some chemical technological processes: extraction, absorption, drying, crystallisation, combustion of liquid fuels, etc., run more rapidly in the presence of oscillating flows. In this chapter we shall discuss some problems connected with both classes of unsteady flows.