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An Experimental Investigation Of Vortex Breakdown In Tubes At High Reynolds Numbers
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Book Synopsis An Experimental Investigation of Vortex Breakdown in Tubes at High Reynolds Numbers by : Francis G. Novak
Download or read book An Experimental Investigation of Vortex Breakdown in Tubes at High Reynolds Numbers written by Francis G. Novak and published by . This book was released on 1998-09-01 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis deals with non-cavitating swirling flows with vortex breakdown in various tubes. Phenomenological and quantitative investigations were carried out at Reynolds numbers as high as 300,000. It was shown that a high Re(D) vortex transitions to its new state (breaks down) via a rapidly spinning spiral form, as demonstrated with 4,000 frame per second video, short exposure time (6 ns) imaging, and Digital Particle Image Velocimetry. Of the known types, the spiral emerges as the fundamental breakdown form and the axisymmetric bubble may now be regarded as a relatively low Re(D) occurrence that is bypassed at sufficiently high Re(D). Some new phenomena were observed at high Re(D): Extremely rapid spiral rotation (over 1,000 revolutions per second), core bifurcation, and changes in the sense of the spiral windings. Familiar features of breakdowns, such as the transition from a jet-like to wake-like axial velocity profile and the rapidly expanding vortex core, were observed in extensive time averaged velocity and turbulence results ascertained with Laser Doppler Velocimetry. However, a mean stagnation point and recirculation were absent in the highest Re(D) flow. The core meandering and stagnation point darting in the turbulent flow field were quantified and discussed in detail.
Book Synopsis An Experimental Investigation of Vortex Breakdown in Multiphase Pipe Flow by : Ronald J. Hugo
Download or read book An Experimental Investigation of Vortex Breakdown in Multiphase Pipe Flow written by Ronald J. Hugo and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Investigation of the Vortex-breakdown Phenomenon by : Turgut Sarpkaya
Download or read book An Experimental Investigation of the Vortex-breakdown Phenomenon written by Turgut Sarpkaya and published by . This book was released on 1970 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of an experimental investigation of the characteristics of stationary and travelling vortex breakdowns in swirling flow in a diverging cylindrical tube are presented and discussed. Basically, three types of vortex breakdown were observed, viz., double helix, spiral, and axisymmetric breakdown. The type and location of the stationary breakdowns were found to be dependent upon the Reynolds and circulation numbers of the flow. The breakdown bubble responded to gradual and abrupt changes in the upstream and downstream flow conditions in a manner analogous to the hydraulic jump in open-channel flow. The observations reported and the evidence presented revealed unmistakably that the vortex breakdown is a finite transition from a uniform state of swirling flow (supercritical) to one (subcritical) featuring a large standing wave, followed by standing wavelets, of finite amplitude. (Author).
Book Synopsis An Experimental Investigation of the Effect of Adverse Pressure Gradient on Vortex Breakdown by : Gale Edward Treiber
Download or read book An Experimental Investigation of the Effect of Adverse Pressure Gradient on Vortex Breakdown written by Gale Edward Treiber and published by . This book was released on 1973 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of an experimental investigation of the effect of adverse pressure gradient on the vortex breakdown phenomenon in a diverging tube are presented. Adverse pressure gradient was found to be as significant in determining the breakdown position as were the previously known parameters of Reynolds and circulation numbers. An approximate momentum analysis for predicting the vortex breakdown position was carried out which appears to hold promise as a breakdown predictor. (Modified author abstract).
Book Synopsis An Experimental Investigation Into Vortex Breakdown and Vortex Breakdown Control by : Sammy Khalil
Download or read book An Experimental Investigation Into Vortex Breakdown and Vortex Breakdown Control written by Sammy Khalil and published by . This book was released on 2006 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Investigation of the Vortex Breakdown Phenomenon in a Diverging Tube by : Luis E. Rodrigues Castro
Download or read book An Experimental Investigation of the Vortex Breakdown Phenomenon in a Diverging Tube written by Luis E. Rodrigues Castro and published by . This book was released on 1969 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Investigation of the Vortex Breakdown Phenomenon in a Diverging Tube by : Charles Lowry Robertson
Download or read book An Experimental Investigation of the Vortex Breakdown Phenomenon in a Diverging Tube written by Charles Lowry Robertson and published by . This book was released on 1971 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Streamwise Fluctuations of Vortex Breakdown at High Reynolds Numbers by :
Download or read book Streamwise Fluctuations of Vortex Breakdown at High Reynolds Numbers written by and published by . This book was released on 2006 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis deals with the characterization of the dependence on the flow geometry of the stream wise fluctuations of the stagnation point of vortex breakdown in axisymmetric tubes and over delta wing aircraft. The statistical analysis presented herein shows that in an axisymmetric tube the 'darting' about the mean stagnation point are distributed normally for the two Reynolds numbers: Re(D) 230,000 and 300,000 (independently of the Reynolds number in the range noted). The darting over a delta wing is not only non-Gaussian but also exhibits rather large localized fluctuations (Stouhal numbers ranging from 0.04 to 0.1). presumably due to the strong influence of the surrounding flow and the geometrical conditions: increase of circulation along the trailing edge, the abrupt separation of flow at the base of the delta wing, and other protuberances that emerge from the upper and lower surfaces of the wing (support elements in laboratory and stabilizers on delta wing aircraft). It is concluded that the behavior of vortex breakdown is strongly dependent on the surrounding geometry and that only experiments in axisymmetric tubes can provide the purest form of vortex breakdown for numerical simulations and analytical studies towards the understanding of the internal turbulence and its spectrum within the breakdown bubble for theoretical and industrial purposes.
Book Synopsis Theoretical and Experimental Investigation of Vortex Breakdown in Diverging Streamtubes by : Kyle P. Judd
Download or read book Theoretical and Experimental Investigation of Vortex Breakdown in Diverging Streamtubes written by Kyle P. Judd and published by . This book was released on 1999 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental investigation of the breakdown of a vortex in a tube by : D. L. I. Kirkpatrick
Download or read book Experimental investigation of the breakdown of a vortex in a tube written by D. L. I. Kirkpatrick and published by . This book was released on 1965 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Investigation of the Inducement of Vortex Breakdown in a Wing-tip Vortex by : Christian Fernando Pinzón
Download or read book Experimental Investigation of the Inducement of Vortex Breakdown in a Wing-tip Vortex written by Christian Fernando Pinzón and published by . This book was released on 2004 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Investigation of the Breakdown of a Vortex in a Tube by : Aeronautical Research Council
Download or read book Experimental Investigation of the Breakdown of a Vortex in a Tube written by Aeronautical Research Council and published by . This book was released on 1965 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Study of Vortex Breakdown in a Cylindrical, Swirling Flow by : José L. Stevens
Download or read book Experimental Study of Vortex Breakdown in a Cylindrical, Swirling Flow written by José L. Stevens and published by . This book was released on 1996 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Investigation of Flow Patterns in Radial-outflow Vortexes Using a Rotating-peripheral-wall Water Vortex Tube by : Arthur Travers
Download or read book Experimental Investigation of Flow Patterns in Radial-outflow Vortexes Using a Rotating-peripheral-wall Water Vortex Tube written by Arthur Travers and published by . This book was released on 1968 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781723049668 Total Pages :146 pages Book Rating :4.0/5 (496 download)
Book Synopsis Experimental Study of Vortex Breakdown in a Cylindrical, Swirling Flow by : National Aeronautics and Space Administration (NASA)
Download or read book Experimental Study of Vortex Breakdown in a Cylindrical, Swirling Flow written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-17 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: The stability of a steady, vortical flow in a cylindrical container with one rotating endwall has been experimentally examined to gain insight into the process of vortex breakdowwn. The dynamics of the flow are governed by the Reynolds number (Re) and the aspect ratio of the cylinder. Re is given by Omega R(sup 2)/nu, where Omega is the speed of rotation of the endwall, R is the cylinder radius, and nu is the kinematic viscosity of the fluid filling the cylinder. The aspect ratio is H/R, where H is the height of the cylinder. Numerical simulation studies disagree whether or not the steady breakdown is stable beyond a critical Reynolds number, Re(sub c). Previous experimental researches have considered the steady and unsteady flows near Re(sub c), but have not explored the stability of the steady breakdown structures beyond this value. In this investigation, laser induced fluorescence was utilized to observe both steady and unsteady vortex breakdown at a fixed H/R of 2.5 with Re varying around Re(sub c). When the Re of a steady flow was slowly increased beyond Re(sub c), the breakdown structure remained steady even though unsteadiness was possible. In addition, a number of hysteresis events involving the oscillation periods of the unsteady flow were noted. The results show that both steady and unsteady vortex breakdown occur for a limited range of Re above Re(sub c). Also, with increasing Re, complex flow transformations take place that alter the period at which the unsteady flow oscillates. Stevens, J. L. and Celik, Z. Z. and Cantwell, B. J. and Lopez, J. M. Ames Research Center VORTEX BREAKDOWN; SWIRLING; FLOW STABILITY; STEADY FLOW; INTERNAL FLOW; REYNOLDS NUMBER; CYLINDRICAL BODIES; ASPECT RATIO; AXISYMMETRIC FLOW; FLOW VISUALIZATION; OSCILLATIONS; PERTURBATION; BUBBLES; UNSTEADY FLOW; VISCOSITY; LASER INDUCED FLUORESCENCE...
Book Synopsis Theoretical and Experimental Investigation of Vortex Breakdown Final Technical Report 1 June 85 by :
Download or read book Theoretical and Experimental Investigation of Vortex Breakdown Final Technical Report 1 June 85 written by and published by . This book was released on 1985 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Investigation of the Breakdown of a Vortex in a Tube by D.L.I.Kirkpatrick by : D.L.I. Kirkpatrick
Download or read book Experimental Investigation of the Breakdown of a Vortex in a Tube by D.L.I.Kirkpatrick written by D.L.I. Kirkpatrick and published by . This book was released on 1964 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
