By Daniel T. H. New, Simon C. M. Yu
In this ebook, fresh advancements in our realizing of primary vortex ring and jet dynamics may be mentioned, so one can shed mild upon their near-field behaviour which underpins a lot in their far-field features. The chapters offer up to date learn findings by means of their respective specialists and search to hyperlink near-field move physics of vortex ring and jet flows with end-applications in brain. during the last decade, our wisdom on vortex ring and jet flows has grown via leaps and limits, due to expanding use of high-fidelity, high-accuracy experimental recommendations and numerical simulations. As such, we've a more robust appreciation and knowing at the initiation and near-field advancements of vortex ring and jet flows less than many various preliminary and boundary stipulations. bankruptcy 1 outlines the vortex ring pinch-off phenomenon and the way it pertains to the preliminary phases of jet formations and next jet behaviour, whereas bankruptcy 2 takes a more in-depth examine the behaviour as a result of vortex ring impingement upon reliable obstacles and the way using a porous floor alters the impingement strategy. Chapters three and four concentration upon the formation of artificial jets from vortex ring buildings experimentally and numerically, the demanding situations in realizing the relationships among their iteration parameters and the way they are often used in move separation keep an eye on difficulties. bankruptcy five seems on the use of implementing chosen nozzle trailing-edge ameliorations to impact alterations upon the near-field dynamics linked to round, noncircular and coaxial jets, with the intention to regulate their blending behaviour. And final yet no longer least, bankruptcy 6 information using certain impinging jet configurations and the way they might lend themselves in the direction of better realizing and working efficacies in warmth move difficulties. This publication can be valuable to postgraduate scholars and researchers alike who desire to wake up to hurry concerning the most up-to-date advancements in vortex ring and jet circulation behaviour and the way their fascinating stream dynamics should be placed into sturdy use of their meant applications.
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Additional info for Vortex Rings and Jets: Recent Developments in Near-Field Dynamics
Maxworthy, T. (1972). Structure and stability of vortex rings. Journal of Fluid Mechanics, 51, 15–32. 33. Maxworthy, T. (1977). Some experimental studies of vortex rings. Journal of Fluid Mechanics, 81, 465–495. 34. , & Gharib, M. (1998). A model for universal time scale of vortex ring formation. Physics of Fluids, 10, 2436–2438. 35. , Ran, H. , & Colonius, T. (2001). Numerical experiments on vortex ring formation. Journal of Fluid Mechanics, 430, 267–282. 36. Moore, D. , & Saffman, P. G. (1973).
By examining the entrainment characteristics among three different velocity programs, they concluded that the variation of Δr is the key parameter responsible for the entrainment of a vortex ring. The higher entrainment rate was observed for cases with rapid initiation and termination, which led to the corresponding larger Δr. In addition, they also found that the entrainment fraction VE/VB (VB is the volume of the vortex ring bubble) is larger for shorter stroke ratio length. Therefore, they suggested that a trapezoidal velocity program with low Lmax/D ratio might be suitable for entrainment enhancement since this program beneﬁts from an impulsive jet initiation as well as a rapid jet termination.
Single arrows represent direction of flow ﬁeld. Reproduced from Adhikari and Lim  51 (a) Primary vortex ring Porous screen (b) (c) Primary vortex ring Secondary vortex ring (d) Merged primary and regenerated vortex rings that in scenario 4, except that higher Reynolds number vortex ring is able to pass through the screen quicker and emerges on the leeside of the screen as a modiﬁed ring. For higher porosity screen, Adhikari and Lim  found that the same four scenarios exist except that each scenario occurs at lower Reynolds number (see for example Fig.