Leonardo's Paradox : path and shape instabilities of particles and bubbles

Bubble and particle laden flows are important in a wide range of industrial and geophysical processes. This broad application field stimulated bubbly and particle laden flow research. In the upper limit research focuses on dense, highly laden flows, which provides overall statistical properties of such flows. In the lower limit the research addresses the problem of single bubble and particle behavior, providing a more fundamental knowledge of the hydrodynamic forces acting on bodies. This thesis focuses on both single solid particle and bubble behavior.