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Wednesday, April 15, 2020 | History

2 edition of An experimental investigation of the vortex breakdown phenomenon in a diverging tube found in the catalog.

An experimental investigation of the vortex breakdown phenomenon in a diverging tube

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Published by Naval Postgraduate School in Monterey, California .
Written in English

    Subjects:
  • Mechanical engineering

  • ID Numbers
    Open LibraryOL25129085M

    Experimental and numerical investigation of the vortex formation process behind a heated cylinder Maosheng Ren, Camilo C. M. Rindt, and Anton A. van Steenhoven Laboratory for Energy Technology, Department of Mechanical Engineering, Eindhoven University of Technology, P.O. Box , MB Eindhoven, The Netherlands. If the cylinder is free to oscillate, the vortex shed-ding process can be severely affected by the oscillations, as pointed out in the reviews [2,3]. Considering the prob-lem of a rigid cylinder mounted on an elastic support with natural frequency f N, the lock-in range is the one in which the f s ˇf N. As a resonant phenomenon, the Vortex Cited by: 1. @article{osti_, title = {Cyclostrophic adjustment in swirling gas flows and the Ranque-Hilsch vortex tube effect}, author = {Kalashnik, M. V., E-mail: [email protected] and Visheratin, K. N.}, abstractNote = {A theoretical analysis of cyclostrophic adjustment is presented; i.e., adjustment to balance between pressure gradient and centrifugal force in axisymmetric flow of . Unfortunately, this book can't be printed from the OpenBook. If you need to print pages from this book, we recommend downloading it as a PDF. Visit to get more information about this book, to buy it in print, or to download it as a free PDF.

    It is the vortex theory of atoms which is the subject of the current investigation. Not because chapter in his book “Higher Speculations”, published in The title of Kragh’s paper, “The is constant over the entire length of the “vortex tube”, see figure 2Smith & Wise , p. 3Alkemade , p. 6.


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An experimental investigation of the vortex breakdown phenomenon in a diverging tube by Luis E. Rodrigues Castro Download PDF EPUB FB2

Full text of "An experimental investigation of the vortex breakdown phenomenon in a diverging other formats NPS ARCHIVE RODRIGUES CASTRO, L. r AN EXPERIMENTAL INVESTIGATION OF THE VORTEX BREAKDOWN PHENOMENON IN A DIVERGING TUBE Luis E.

Rodriguez Castro INTER " V. Title from cover. This banner text can have markup. web; books; video; audio; software; imagesPages: vortex core. It was therefore decided to study first the similar phenomenon Of vertex breakdown in a tube, to look ;for the characteristic features of such a breakdown, end to use the results tc guide further analyses cf the breakdo%vn Of leading-edge vortices.

^phenomenon of vortex breakdown » develops on the rotating endwall feeds vorticity into a vortex filament that appears on the symmetry Size: 1MB. An experimental investigation is carried out on Ranque–Hilsch vortex tube (RHVT).

Influential parameters such as L/D ratio, cold mass fraction, inlet pressure etc. are investigated. Further, three different working media (air, nitrogen and carbon dioxide) are also tested.

An in-house facility is developed to test the vortex by: An Investigation on Vortex Breakdown Phenomena 30 cm at its base. This piece has two functions. First, it was part at the entrance channel which conveyed the fluid to. load. An experimental investigation in mitigation of the vortex rope phenomenon by injecting water axially in the centre of the draft tube on a pump-turbine model was carried out.

Also the mitigation by additionally injected air in the centre of the draft tube was analysed. The results of the experimental investigation are focused on the reduction. The vortex tube was first reported by Ranque () and was later popularized by Hilsch ().Since then, many efforts have been made to investigate the transfer mechanism and performance of energy separation in a vortex tube (Eiamsa-ard and Promvonge,Yilmaz et al., ).In theories, Fulton () explained that the energy separation is due to the free and Cited by: Simulating vortex breakdown in a slightly diverging tube showed stable bubble-and further downstream spiral-type breakdown.

The location and internal structure of the bubble corresponds to experimental by: Experimental Investigation of Vortex Generator Effect on Two- and Three -Dimensional NASA Common Research Models Shunsuke Koike 1, Kazuyuki Nakakita. 2, Tsutomu Nakajima. 3, Seigo Koga. 4, Mamoru Sato. 5, Hiroshi Kanda.

6, Kazuhiro Kusunose. 7, Mitsuhiro Murayama 8, Yasushi Ito 9, and Kazuomi Yamamoto 10File Size: 2MB. The three-dimensional nature of vortex breakdown, while widely recognized, has seldom been included in the analytical investigations and, until recently, the numerical simulations of this phenomenon.

The principle asymmetric effects are examined by considering the impact that a weak perturbation has on an axisymmetric vortex. An experimental investigation on vortex breakdown on delta wings at high angles of attack is presented.

As suggested by previous works, perturbations are used to change the platform of the delta wings to reduce the detrimental effects of vortex breakdown brought about by the Self-Induction Theory.

Different. Vortex stability and breakdown - Survey and extension. Sidney Leibovich ; Sidney Leibovich. Cornell University, Ithaca, New York A combined experimental and analytical investigation of the vortex stability over sharp-edged slender bodies.

Review of theoretical approaches to the vortex breakdown by: Vortex tube is a simple-compact device, which produces cooling at one end and heating at the other end simultaneously. The vortex tube was invented in by George Ranque [1] and later developed in by Rudolf Hilsch. In memory of their contribution the Vortex tube is also known as Ranque-Hilsch vortex tube (RHVT).File Size: KB.

Experimental study of mitigation of a spiral vortex breakdown at high Reynolds number under an adverse pressure gradient Physics of Flu ( Benjamin, “ Theory of the vortex breakdown phenomenon,” J.

Fluid Mech. 14 Cited by:   In the present study, it was aimed to produce a fundamental i nformation and to investigate the effects of various design parameters on tube performance characteristics by setting up vortex tube experimental system in order to study the parameters predetermined for the design of vortex tubes and by conducting thermodynamic analysis.

According to the findings of Cited by: 3. The phenomenon examined is the abrupt structural change which can occur at some station along the axis of a swirling flow, notably the leading-edge vortex formed above a delta wing at by: the air at the entrance of the vortex tube and the length of the vortex tube on the performance of the RHVTs, by using a vortex tube with D = 18mm and L = x D = mm.

They noted that L/D should be between Library LiBr. — N Mo'rft'erey ABSTRACT Theresultsofanexperimentalinvestigationoftheeffect ofadversepressuregradientonthevortexbreakdownphenom. cently, vortex breakdown was controlled by the rotation of a small rod,31 a small lid,32 or a small disk33 opposite to the driving disk.

Finally, it was shown that the use of a conical lid strongly influences the stability of vortex breakdown Experimentally, there are few publications of control of vortex breakdown.

One idea tested was the. Experimental investigation of vortex flow in a two-chamber solar thermochemical reactor. where solar flux entering through the window is focused at the aperture plane before diverging into the lower chamber, where the chemical reaction occurs.

Vortex breakdown. KW - Vortex flow. KW - Cited by: 9. ENR EXPERIMENTAL RESEARCH ON VORTEX TUBE Y T Wu 1, Y Ding 1, Y B Ji 1, C F Ma1, M C Ge2 1Beijing University of Technology, Beijing, China 2 Institute of Engineering Thermophysics, Chinese Academy of Science, Beijing, China Abstract Vortex tube is a simple energy se parating device which is compact, si mple to produce and to by: 2.

The phenomenon has previously been examined in detail for the type of report, however, gives experimental evidence from swirling flow that leads to the contrary conclusion that, on the relation between the two forms of breakdown.

The water vortex tube referred to in Ref. 2 was used in the experunents and is shown in Fig. SwirlFile Size: 3MB. helical vortex breakdown. Helical, or spiral, form of vortex breakdown is cause of severe pressure pulsations and performance deterioration.

Photo from present experimental investigation shows the runner cone and the cavitating spiral vortex breakdown in a diffuser with axial and circumferential velocity component at the inlet, see FigFile Size: KB. vortex tube that focused on the thermal performance with different geometrical parameters.

The vortex tube or RHVT can be classified into two types; first is counter flow RHVT and second type is uni-flow RHVT [6]. In the counter-flow vortex tube type the cold An Experimental Investigation of the OptimumFile Size: KB.

presented research paper on topic, ’Experimental investigation of vortex tube refrigeration’. In the paper they have used different material for construction of the vortex tube viz: copper and PVC. Also they have changed number of nozzles and have investigated its effect.

They have also highlighted the effect of varying. Experimental investigation of the subwing tip and its vortex structure (NASA contractor report) [Tangler, James L] on *FREE* shipping on qualifying offers. Experimental investigation of the subwing tip and its vortex structure (NASA contractor report)Author: James L Tangler.

Vortex diffusion resulting from the interaction of twin vortices generated by a "subwing" tip was experimentally in- vestigated. The purpose of the investigation was to provide a better understanding of the subwing's vortex structure relative to a square tip for several angle of attack and yaw angles.

The tests on the vortex-induced vibration (VIV) of the cylinders with different helical strakes were carried out in a uniform current. Both in-line and cross-flow responses were measured and a comprehensive analysis was made in order to understand the phenomenon of VIV mitigation by helical strake and find optimal design parameters, which are more effective for VIV mitigation, Cited by: 1.

discussed in the flowing chapter, including the uni-flow vortex tube, which has the cold and hot exists located at the same end of the tube.

Since only the counter-flow vortex tube was investigated in this study, hereafter the vortex tube, without any further specific description, will refer to a counter-flow vortex tube. Figure File Size: 1MB.

The vortex breakdown inside a cylinder with a rotating top lid is controlled experimentally by injecting at the bottom a fluid with a small density difference.

The density difference is obtained by mixing a heavy dye or alcohol with water in order to create a jet denser or lighter than water. The injection of a heavy fluid creates a buoyancy force downward, which Cited by: As typical application of this phenomenon, there is a vortex tube.

The vortex tube was suggested for the first time by J. Ranque[1], R. Hilsch[2] designed and produced the tube to carried out the experiment. Since then, the vortex tube has been known as Ranque vortex tube (RVT), Hilsch Vortex tube (RHVT) and Ranque-Hilsch vortex tube (RHVT).

Experimental and numerical investigation of the vortex formation process behind a heated cylinder Citation for published version (APA): Ren, M., Rindt, C.

M., & Steenhoven, van, A. Experimental and numerical investigation of the vortex formation process behind a heated cylinder.

Physics of Fluids, 16(8), Cited by: Experimental investigation of vortex shedding from a plate: effect of external velocity perturbation J. Wu a, J. Sheridan a, J. Soria b, M.

Welsh b and K. Hourigan b a Department of Mechanical Engineering, Monash University, ClaytonAustralia. an experimental investigation of vortex generation in a turbulent boundary layer undergoing adverse pressure gradient new york university university heights, bronx, n.y.

for langley research center national aeronautics and space administration washington, d. june i.~. Abstract—The present paper investigates an experimental work to study the performance of manufactured counter flow vortex tube incorporated with set of generator nozzles of N = 2, 3, 6 and aspect ratio, AR = These elongated counterflows are wildly turbulent but survive intense mixing, a seeming paradox.

Local counterflows, whose spatial extent is small compared with that of surrounding flows, occur behind bluff bodies and in swirling streams. The latter are often referred to as vortex breakdown bubbles, which occur in tornadoes and above delta by: 9. EXPERIMENTAL INVESTIGATION OF ROTOR VORTEX WAKES IN DESCENT Fig.

1 Model 3-bladed rotor. Diameter is cm. Dye and air enter the tubes at the root, flow through the blades to the tips, and enter the flow tangentially. The rotor was driven by a digitally-controlled microstepper motor (25, pulses per revolution), allowing for precise. Analyze the experimental data of copper vortex tube and pvc vortex tube.[2] III.

LITERATURE SURVEY In this work writing review is done on different experimental investigation and study on vortex tube. Yunpeng Xue et al,Vortex tube is a simple mechanical device used for separating a compressed fluid for the most part air into stream of. Reference. Arionfard, H., Nishi, Y.

Experimental Investigation of a Drag Assisted Vortex-Induced Vibration Energy Converter, Journal of Fluids and Structures 68 () 48– Department of Systems Design for Ocean-Space, Faculty of Engineering, Yokohama National University, Tokiwadai, Hodogaya, Yokohama, Japan.

Design and Computation of COP of Vortex Tube K. DEPT. OF MECHANICAL ENGINEERING. UNIVERSITY OF KERALA. Abstract— Vortex tube is a mechanical device operating as a refrigerating machine without any moving parts, by separating a compressed gas stream into a low total temperature region and a high one.A vortex tube is a deviceFile Size: KB.cooling effect of the vortex tube which is up to 5ᵒC lower by using a diffuser.

The developed vortex tube is superior to the conventional vortex tube but also superior to that made in other country as shown in Fig Fig Comparison between different problems in ΔT c.[2] Rahim Shamsoddini and Alireza Hossein Nezhad [3] put. The boundary for the onset of vortex ring flow breakdown in low speed flight is derived from a physical hypothesis expressed as an extension of simple momentum theory.

Predictions are adjusted to accord with measurements found in the literature and with some further deductions made regarding the nature of the flow in the vortex ring state. The Cited by: 6.