title: Drag reduction by compressible bubbles.
abstract: Drag reduction by bubbles in stationary turbulent flows is sensitive to the compressibility of the bubbles. Without this dynamical effect the bubbles only renormalize the fluid density and viscosity, an effect that by itself can only lead to a small percentage of drag reduction. We show in this paper that the dynamics of bubbles and their effect on the compressibility of the mixture can lead to a much higher drag reduction.
authors.affiliation: Department of Chemical Physics, The Weizmann Institute of Science, Rehovot 76100, Israel.
authors.forename: T S
authors.initials: TS
authors.lastname: Lo
authors.forename: Victor S
authors.initials: VS
authors.lastname: L'vov
authors.forename: Itamar
authors.initials: I
authors.lastname: Procaccia