Dynamics of a linear array of vortices in a shallow fluid layer

Abstract

In this thesis we experimentally study a linear array of vortices in a shallow fluid layer. The flow is driven by time-(in)dependent electromagnetic forcing. In particular, we measure the velocity, its gradient, and the distance between stagnation points along the centerline of the container. Moreover, we study the corresponding fluctuations of such quantities. This is accomplished via Particle Image Velocimetry (PIV). For time-independent forcing, we show that the velocity and its gradient monotonically increase for increasing voltage. The experimental results for the scaling of such quantities is partially described by a phenomenological theory. As for time-dependent forcing, we find resonant frequencies for the transverse velocity fluctuations, the velocity gradient, and its corresponding fluctuations. In terms of such frequencies, we perform rescalings and reveal self-similar properties of the flow.

Date of Award	31 Jul 2009
Original language	English
Supervisor	F. Fontenele Araujo Junior (Supervisor 1), Ruben R. Trieling (Supervisor 2) & G.J.F. van Heijst (Supervisor 2)