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Interaction Of A Turbulent Round Jet With The Free Surface
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Book Synopsis INTERACTION OF A TURBULENT ROUND JET WITH THE FREE SURFACE. by : KOOROSH MADNIA
Download or read book INTERACTION OF A TURBULENT ROUND JET WITH THE FREE SURFACE. written by KOOROSH MADNIA and published by . This book was released on 1989 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: jet growth rate. This is the result of the different dynamics of vorticity on the free surface compared to a solid wall. The skin friction at the solid wall and increased growth rate combined to give a different maximum velocity decay rate compared to the free-surface jet.
Book Synopsis INTERACTION OF A TURBULENT ROUND JET WITH THE FREE SURFACE. by : KOOROSH MADNIA
Download or read book INTERACTION OF A TURBULENT ROUND JET WITH THE FREE SURFACE. written by KOOROSH MADNIA and published by . This book was released on 1989 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: jet growth rate. This is the result of the different dynamics of vorticity on the free surface compared to a solid wall. The skin friction at the solid wall and increased growth rate combined to give a different maximum velocity decay rate compared to the free-surface jet.
Book Synopsis Dynamics of a Turbulent Jet Interacting with a Free Surface by : Norberto Mangiavacchi
Download or read book Dynamics of a Turbulent Jet Interacting with a Free Surface written by Norberto Mangiavacchi and published by . This book was released on 1994 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :American Society of Mechanical Engineers. Fluids Engineering Division Publisher : ISBN 13 : Total Pages :184 pages Book Rating :4.3/5 (91 download)
Book Synopsis Free-surface Turbulence by : American Society of Mechanical Engineers. Fluids Engineering Division
Download or read book Free-surface Turbulence written by American Society of Mechanical Engineers. Fluids Engineering Division and published by . This book was released on 1994 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Interaction of a Swirling Jet with a Free Surface by : Michael S. Feyedelem
Download or read book Interaction of a Swirling Jet with a Free Surface written by Michael S. Feyedelem and published by . This book was released on 1996 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt: The turbulent flow field of a swirling jet issuing from a nozzle, beneath and parallel to a free surface has been studied in as much detail as possible using a three-component laser Doppler velocimeter and flow visualization. The results have shown that the swirl leads to the faster spreading and quicker mixing of the jet. For strongly swirling jets (S = 0.522), the similiarity is not reached within ten diameters downstream. The results have also shown that both the acial and tangential velocity components decrease outward from the jet axis, naturall leading to centrifugal instabilities. This, in turn, leads to the creation of large scale coherent structures at the periphery of the jet, particularly when it is in the vicinity of the free surface. The turbulent shear stresses exhibit anisotropic behavior, the largest always being in the plane passing through the jet axis. The change of TKE with S is not monotonic. It is maximum for S - 0.265, smallest for S = 0.50, and has an intermediate value for S - 0.522. This is due to the occurrence of vortex breakdown and the resulting intensification of the turbulence within the jet prior to its exit from the nozzle.
Book Synopsis Studies of Turbulent Round Jets Through Experimentation, Simulation, and Modeling by : Ryan Keedy
Download or read book Studies of Turbulent Round Jets Through Experimentation, Simulation, and Modeling written by Ryan Keedy and published by . This book was released on 2013 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis studies the physics of the turbulent round jet. In particular, it focuses on three different problems that have the turbulent round jet as their base flow. The first part of this thesis examines a compressible turbulent round jet at its sonic condition. We investigate the shearing effect such a jet has when impinging on a solid surface that is perpendicular to the flow direction. We report on experiments to evaluate the jet's ability to remove different types of explosive particles from a glass surface. Theoretical analysis revealed trends and enabled modeling to improve the predictability of particle removal for various jet conditions. The second part of thesis aims at developing a non-intrusive measurement technique for free-shear turbulent flows in nature. Most turbulent jet investigations in the literature, both in the laboratory and in the field, required specialized intrusive instrumentation and/or complex optical setups. There are many situations in naturally-occurring flows where the environment may prove too hostile or remote for existing instrumentation. We have developed a methodology for analyzing video of the exterior of a naturally-occurring flow and calculating the flow velocity. We found that the presence of viscosity gradients affects the velocity analysis. While these effects produce consistent, predictable changes, we became interested in the mechanism by which the viscosity gradients affect the mixing and development of the turbulent round jet. We conducted a stability analysis of the axisymmetric jet when a viscosity gradient is present. Finally, the third problem addressed in this thesis is the growth of liquid droplets by condensation in a turbulent round jet. A vapor-saturated turbulent jet issues into a cold, dry environment. The resulting mixing produces highly inhomogeneous regions of supersaturation, where droplets grow and evaporate. Non-linear interactions between the droplet growth rate and the supersaturation field make analysis computationally taxing. A Probability Density Function (PDF) model for the concentration of scalars, as well as for the droplet number in different size bins, is developed. The growth of droplets as they evolve along the jet, for different downstream and radial positions, compared favorably with experimental measurements in the literature. We utilized a graphical processing unit with the PDF method to more efficiently compute the statistics of the droplet diameter in the non-uniform supersaturation field.
Author :Christopher Radcliff Anderson Publisher :American Mathematical Soc. ISBN 13 :9780821896969 Total Pages :776 pages Book Rating :4.8/5 (969 download)
Book Synopsis Vortex Dynamics and Vortex Methods by : Christopher Radcliff Anderson
Download or read book Vortex Dynamics and Vortex Methods written by Christopher Radcliff Anderson and published by American Mathematical Soc.. This book was released on 1991-12-23 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding vortex dynamics is the key to understanding much of fluid dynamics. For this reason, many researchers, using a great variety of different approaches--analytical, computational, and experimental--have studied the dynamics of vorticity. The AMS-SIAM Summer Seminar on Vortex Dynamics and Vortex Methods, held in June 1990 at the University of Washington in Seattle, brought together experts with a broad range of viewpoints and areas of specialization. This volume contains the proceedings from that seminar. The focus here is on the numerical computation of high Reynolds number incompressible flows. Also included is a smaller selection of important experimental results and analytic treatments. Many of the articles contain valuable introductory and survey material as well as open problems. Readers will appreciate this volume for its coverage of a wide variety of numerical, analytical, and experimental tools and for its treatment of interesting important discoveries made with these tools.
Book Synopsis Fluid Mechanics and Fluid Power – Contemporary Research by : Arun K. Saha
Download or read book Fluid Mechanics and Fluid Power – Contemporary Research written by Arun K. Saha and published by Springer. This book was released on 2016-09-20 with total page 1638 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume comprises the proceedings of the 42nd National and 5th International Conference on Fluid Mechanics and Fluid Power held at IIT Kanpur in December, 2014.The conference proceedings encapsulate the best deliberations held during the conference. The diversity of participation in the conference, from academia, industry and research laboratories reflects in the articles appearing in the volume. This contributed volume has articles from authors who have participated in the conference on thematic areas such as Fundamental Issues and Perspectives in Fluid Mechanics; Measurement Techniques and Instrumentation; Computational Fluid Dynamics; Instability, Transition and Turbulence; Turbomachinery; Multiphase Flows; Fluid‐Structure Interaction and Flow‐Induced Noise; Microfluidics; Bio‐inspired Fluid Mechanics; Internal Combustion Engines and Gas Turbines; and Specialized Topics. The contents of this volume will prove useful to researchers from industry and academia alike.
Book Synopsis Experimental Study on Turbulent Characteristics of Surface Attaching Jets by : Mohammad Rahman
Download or read book Experimental Study on Turbulent Characteristics of Surface Attaching Jets written by Mohammad Rahman and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The characteristics of turbulent jets interacting with a free surface were investigated experimentally. The experiments were performed to quantify the effects of offset height and nozzle geometry on the turbulent characteristics at low Reynolds number (Re = 5500). The offset height ratio of a square jet was varied from 1 to 4. For the nozzle geometry effect, four nozzle configurations including circular, square, rectangular with minor axis oriented parallel to the surface-normal direction, and rectangular with its major axis oriented parallel to the surface-normal direction were tested with a fixed offset height ratio of 2. A particle image velocimetry system was used to perform the velocity measurements. Various quantities were investigated, including instantaneous velocities and turbulent statistics up to the fourth order moment. The jet-surface interaction was examined using mean surface velocity, velocity defect, vorticity thickness and surface turbulence intensities. The turbulent structures in the interaction region were investigated using two-point correlations, joint probability density functions and proper orthogonal decomposition (POD). Turbulent statistics along the free surface revealed that the surface was in the state of stretching and contracting due to the alternating velocity gradient. The straining effect became more severe for shallower jet. For a given offset height ratio, the greatest mean strain at the free surface was produced by the jet issuing in the minor plane of the rectangular nozzle. This nozzle configuration also led to enhancements in the peak values of the surface velocity (about 37%) and turbulence intensities (up to 24%) compared to the circular, square and the jet discharged in the major plane of the rectangular nozzle. The two-point correlations and POD results indicated that the spatial coherence of the velocity fluctuations reduced in the upper shear layer than the lower shear layer. Shorter offset height ratio experienced a slower fractional energy convergence due to a reduction in the structure size under confinement. The re-orientation of the rectangular nozzle to major axis increased the spatial coherence in the interaction region, which led to an about 21% higher fractional energy contribution of the most dominant POD mode (the first mode) compared to the other configurations.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Whole-field Velocity Measurements in a Turbulent Free-surface Jet by : John O. Scherer
Download or read book Whole-field Velocity Measurements in a Turbulent Free-surface Jet written by John O. Scherer and published by . This book was released on 1995 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Free-surface Turbulent Flows by : Wen-Ling Hong
Download or read book Free-surface Turbulent Flows written by Wen-Ling Hong and published by . This book was released on 2000 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flow Control Techniques and Applications by : Jinjun Wang
Download or read book Flow Control Techniques and Applications written by Jinjun Wang and published by Cambridge University Press. This book was released on 2018-12-13 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt: Master the theory, applications and control mechanisms of flow control techniques.
Book Synopsis Modeling and Simulation of Turbulent Mixing and Reaction by : Daniel Livescu
Download or read book Modeling and Simulation of Turbulent Mixing and Reaction written by Daniel Livescu and published by Springer Nature. This book was released on 2020-02-19 with total page 273 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights recent research advances in the area of turbulent flows from both industry and academia for applications in the area of Aerospace and Mechanical engineering. Contributions include modeling, simulations and experiments meant for researchers, professionals and students in the area.
Book Synopsis VORTEX RING INTERACTION WITH A FREE SURFACE. by : MUSEOK SONG
Download or read book VORTEX RING INTERACTION WITH A FREE SURFACE. written by MUSEOK SONG and published by . This book was released on 1991 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: generated by the contaminant gradient. The distribution of the contaminant during the interaction depends on the strength of the contamination. Results are also compared to a collision with a no-slip surface.
Download or read book Turbulent Jets written by N. Rajaratnam and published by Elsevier. This book was released on 1976-01-01 with total page 315 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulent Jets
Book Synopsis Experimental Study of Submerged Turbulent Twin Jets Interacting with a Free Surface and a Solid Wall by : Ebenezer Essel
Download or read book Experimental Study of Submerged Turbulent Twin Jets Interacting with a Free Surface and a Solid Wall written by Ebenezer Essel and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents an experimental investigation of the effects of offset height ratio and boundary condition (free surface and solid wall) on the turbulence characteristics of submerged twin jets issuing from two parallel round nozzles. A particle image velocimetry (PIV) technique was used to conduct two sets of experiments. The first set of experiments focused on twin surface jets at Reynolds number, Re = 4400, separation ratio (G/d = 2.3) and offset heights, 1d, 2d, 3d and 4d from the free surface. The second set of experiments, which was designed based on the main findings of the previous experiment, examined the effects of free surface and wall on the turbulence structure of the twin jets. These experiments were performed at Re = 5000, G/d = 2 and offset heights, 1d, 2d and 4d from the free surface or wall. For the surface jets, the mean velocity and turbulence intensities at the free surface rapidly increased beyond the attachment point by amounts that increases with decreasing offset ratio. Further downstream, the surface transverse turbulence intensities decayed to negligible values while the streamwise turbulence intensities were persistent because of the energy redistribution from the transverse Reynolds normal stress to the tangential (streamwise and spanwise) Reynolds stresses. For both boundary conditions, the attachment length, Reynolds stresses and the spatial extents of the large-scale structures increased with increasing offset ratio. The transition of the twin jets to a single jet was more rapid as offset ratio increases due to the enhanced entrainment and mixing for larger offset ratios. The evolution of the jet farther away from the free surface or wall behaved like a free jet, but the decay rate of the jet interacting with each boundary was substantially reduced in the far field due to confinement effects. The difference between the effects of free surface and wall on the mean velocity, Reynolds stresses and triple velocity correlations were confined to the immediate vicinity of each boundary. The interaction between the large-scale structures and the boundaries were also investigated using various multi-point statistical techniques such as discrete wavelet transform, linear stochastic estimation, swirling strength, joint probability density function and two-point velocity correlations. The results showed that, the wall considerably reduced the spatial coherence of the structures embodied in the transverse auto-correlations compared to those near the free surface.