In this book recent developments in our understanding of fundamental vortex ring and jet
dynamics will be discussed with a view to shed light upon their near-field behaviour which
underpins much of their far-field characteristics. The chapters provide up-to-date research
findings by their respective experts and seek to link near-field flow physics of vortex ring
and jet flows with end-applications in mind. Over the past decade our knowledge on vortex ring
and jet flows has grown by leaps and bounds thanks to increasing use of high-fidelity
high-accuracy experimental techniques and numerical simulations. As such we now have a much
better appreciation and understanding on the initiation and near-field developments of vortex
ring and jet flows under many varied initial and boundary conditions. Chapter 1 outlines the
vortex ring pinch-off phenomenon and how it relates to the initial stages of jet formations and
subsequent jet behaviour while Chapter 2 takes a closer look at the behaviour resulting from
vortex ring impingement upon solid boundaries and how the use of a porous surface alters the
impingement process. Chapters 3 and 4 focus upon the formation of synthetic jets from vortex
ring structures experimentally and numerically the challenges in understanding the
relationships between their generation parameters and how they can be utilized in flow
separation control problems. Chapter 5 looks at the use of imposing selected nozzle
trailing-edge modifications to effect changes upon the near-field dynamics associated with
circular noncircular and coaxial jets with a view to control their mixing behaviour. And last
but not least Chapter 6 details the use of unique impinging jet configurations and how they
may lend themselves towards greater understanding and operating efficacies in heat transfer
problems. This book will be useful to postgraduate students and researchers alike who wish to
get up to speed regarding the latest developments in vortex ring and jet flow behaviour and how
their interesting flow dynamics may be put into good use in their intended applications.
