Critical Density Triplets for the Arrestment of a Sphere Falling in a Sharply Stratified Fluid

The chapter 'Critical Density Triplets for the Arrestment of a Sphere Falling in a Sharply Stratified Fluid' investigates the intriguing phenomenon of particle bouncing in stratified fluids. It begins with an introduction to stratified fluids and their natural occurrences, followed by a detailed discussion of the experimental findings by Abaid et al. on the bouncing phenomenon of a sphere falling in stratified saltwater. The study focuses on three key parameters: Reynolds number, layer thickness, and density relations between the top and bottom fluids and the sphere. The authors explore the dependence of the bounce phenomenon on layer thickness experimentally and theoretically, aiming to determine a critical density triplet that predicts the conditions under which a sphere will bounce, stop momentarily, or fall without bouncing. The chapter also delves into the potential energy of the sphere-fluid system, providing an alternative explanation for the levitation phenomenon. Through numerical simulations and experimental data, the authors identify the critical density triplet and discuss the implications of their findings for understanding particle dynamics in stratified fluids.