Download or read book Investigation of a Round Jet Into a Counterflow written by Hau-cheung Chan and published by . This book was released on 1998 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Investigation of a Round Jet Into a Counterflow written by 陳孝章 and published by . This book was released on 2017-01-26 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Investigation of the Velocity Field of Jets in Counter flow in the Vicinity of a Solid Wall written by Mohammad Mahmoudi and published by . This book was released on 2015 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study presents experimental investigations showing the mean and fluctuating velocity field of a three dimensional round jet in counter-flow located in the vicinity of a solid wall. The jet to counter-flow velocity ratios ranged from 2.5 to 25 and the jet Reynolds numbers were from 1,000 to 10,000. The ratio of jet centerline distance from the wall over the jet diameter is changed from 0.5 to 4.3. The penetration of the flush mounted jet in counter-flow is measured and compared to the case in which there is no wall available. In addition, the penetration of the jet at various offset distances from the wall is measured and the effect of offset distance is analyzed. The results show that the flush mounted jet has the deepest penetration and as the jet offset distance increases, the penetration decreases to reach the penetration of a free jet in counter-flow. The jet offset distance creates a mechanism that controls the counter-flow entrainment into the jet. The jet velocity decay and spreading rate are analyzed and the effect of offset ratio is discussed. It is found that as the offset ratio increases, the jet velocity decays faster and its spreading rate rises. In addition, the amplitude of random oscillations of the flow increases when the distance of the jets from the side wall increases. The vortical structures of the flow are studied and their impact on the turbulence characteristics of the flow is explained. Two-point velocity correlation study shows that the size of turbulent structures of the flow becomes larger as the jet offset ratio increases. Also, the turbulent transport in the flow enhances dramatically as the jet gets higher distance from the side wall.

Download or read book Engineering Turbulence Modelling and Experiments 5 written by W. Rodi and published by Elsevier. This book was released on 2002-08-21 with total page 1029 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulence is one of the key issues in tackling engineering flow problems. As powerful computers and accurate numerical methods are now available for solving the flow equations, and since engineering applications nearly always involve turbulence effects, the reliability of CFD analysis depends increasingly on the performance of the turbulence models. This series of symposia provides a forum for presenting and discussing new developments in the area of turbulence modelling and measurements, with particular emphasis on engineering-related problems. The papers in this set of proceedings were presented at the 5th International Symposium on Engineering Turbulence Modelling and Measurements in September 2002. They look at a variety of areas, including: Turbulence modelling; Direct and large-eddy simulations; Applications of turbulence models; Experimental studies; Transition; Turbulence control; Aerodynamic flow; Aero-acoustics; Turbomachinery flows; Heat transfer; Combustion systems; Two-phase flows. These papers are preceded by a section containing 6 invited papers covering various aspects of turbulence modelling and simulation as well as their practical application, combustion modelling and particle-image velocimetry.

Download or read book Design and Modeling of Mechanical Systems II written by Mnaouar Chouchane and published by Springer. This book was released on 2015-03-24 with total page 814 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers a collection of original peer-reviewed contributions presented at the 6th International Congress on Design and Modeling of Mechanical Systems (CMSM’2015), held in Hammamet, Tunisia, from the 23rd to the 25th of March 2015. It reports on both recent research findings and innovative industrial applications in the fields of mechatronics and robotics, dynamics of mechanical systems, fluid structure interaction and vibroacoustics, modeling and analysis of materials and structures, and design and manufacturing of mechanical systems. Since its first edition in 2005, the CMSM Congress has been held every two years with the aim of bringing together specialists from universities and industry to present the state-of-the-art in research and applications, discuss the most recent findings and exchange and develop expertise in the field of design and modeling of mechanical systems. The CMSM Congress is jointly organized by three Tunisian research laboratories: the Mechanical Engineering Laboratory of the National Engineering School of Monastir; the Mechanical Laboratory of Sousse, part of the National Engineering School of Sousse; and the Mechanical, Modeling and Manufacturing Laboratory at the National Engineering School of Sfax.

Download or read book Design and Modeling of Mechanical Systems III written by Mohamed Haddar and published by Springer. This book was released on 2017-11-25 with total page 1225 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers a collection of original peer-reviewed contributions presented at the 7th International Congress on Design and Modeling of Mechanical Systems (CMSM’2017), held in Hammamet, Tunisia, from the 27th to the 29th of March 2017. It reports on both research findings, innovative industrial applications and case studies concerning mechanical systems and related to modeling and analysis of materials and structures, multiphysics methods, nonlinear dynamics, fluid structure interaction and vibroacoustics, design and manufacturing engineering. Continuing on the tradition of the previous editions, this proceedings offers a broad overview on the state-of-the art in the field and a useful resource for academic and industry specialists active in the field of design and modeling of mechanical systems. CMSM’2017 was jointly organized by two leading Tunisian research laboratories: the Mechanical, Modeling and Manufacturing Laboratory of the National Engineering School of Sfax and the Mechanical Engineering Laboratory of the National Engineering School of Monastir..

Download or read book Direct and Large Eddy Simulation XII written by Manuel García-Villalba and published by Springer Nature. This book was released on 2020-05-09 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers the proceedings of the 12th instalment in the bi-annual Workshop series on Direct and Large Eddy Simulation (DLES), which began in 1994 and focuses on modern techniques used to simulate turbulent flows based on the partial or full resolution of the instantaneous turbulent flow structure. With the rapidly expanding capacities of modern computers, this approach has attracted more and more interest over the years and will undoubtedly be further enhanced and applied in the future. Hybrid modelling techniques based on a combination of LES and RANS approaches also fall into this category and are covered as well. The goal of the Workshop was to share the state of the art in DNS, LES and related techniques for the computation and modelling of turbulent and transitional flows. The respective papers highlight the latest advances in the prediction, understanding and control of turbulent flows in academic and industrial applications.

Download or read book Investigation of the Penetration of a Jet Into a Counterflow written by T. R. Krishna Rao and published by . This book was released on 1958 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Global Behavior of a Round Buoyant Jet in a Counterflow written by Wing-Yan Lee and published by . This book was released on 2017-01-26 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Global Behavior of a Round Buoyant Jet in a Counterflow" by Wing-yan, Lee, 李永仁, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled "Global Behavior of a Round Buoyant Jet in a Counterflow" Submitted by Lee Wing Yan for the degree of Master of Philosophy at the University of Hong Kong in January 2006 In this study, time-averaged global spreading patterns of a round buoyant jet discharging horizontally into a counterflow were investigated with laser-induced fluorescence (LIF) measurements in a laboratory flume. Time-averaged mean concentration fields of jet effluent were obtained from LIF on the central vertical plane of the buoyant jet for different combinations of Froude number and jet-to-current velocity ratio. The densimetric Froude number (Fr) characterizes the ratio between the initial buoyancy force on the jet effluent and the initial jet momentum. The jet-to-current velocity ratio (R) compares the initial jet exit velocity to the speed of the counterflow. Experiments were carried out at Froude numbers Fr = 3 to 10 and velocity ratios R between 2.5 and 15. The concentration fields were analyzed with a number of image processing algorithms to study the spreading and dilution pattern. Quantitative information on the flow pattern was obtained, and this including the trajectory of the jet centerline, the development of jet widths, the drop of centerline concentration and the radial concentration profiles. It was found that the jet flow can be divided in two flow regions. In the first region near the jet exit, the forward jet momentum dominated and the jet penetrated into the counterflow primarily along the horizontal direction. The jet width increased due to interaction with the counterflow. When the jet forward velocities decreased farther downstream, the effect of buoyancy became obvious and gradually increasing vertical rise of the jet was observed. At penetration point, the forward jet velocities dropped to zero and the counterflow velocity took over and advected the still buoyant jet effluent backwards. In this second region of backward flow, the jet behaved like a buoyant line thermal, being advected backwards by the counterflow. The width of the jet increased at a faster rate than in the first region, but the concentration levels were much lower. Radial profiles of mean effluent concentration at successive stations along the jet centerline were found to follow reasonably well the Gaussian distribution. The predictions of the Lagrangian model JETLAG were compared with the experimental data for this complex situation of a buoyant jet in counterflow. The Lagrangian integral model JETLAG was found to give satisfactory overall predictions of jet centerline trajectories and concentrations for most situations. However, the model tended to over-predict the horizontal and vertical locations of the penetration point. In particular, predictions in the second flow region did not agree well with data in the weak counterflow situations. This discrepancy can be traced to the break down of the boundary layer approximations (inherent in an integral jet model) near and beyond the penetration point, when the flow changes from parabolic to more elliptic in nature. JETLAG also over-predicted the centerline concentration before penetration point in strong counterflows. This may be due to simplified treatment of the jet potential core in the calculation. Length scale analysis was conducted on the jet centerline trajectories and dilution from experiments a

Download or read book Sprayed Concrete Lined Tunnels written by Alun Thomas and published by CRC Press. This book was released on 2008-10-08 with total page 2354 pages. Available in PDF, EPUB and Kindle. Book excerpt: Practising engineers on site, in the design office or in client organizations will find this book an excellent introduction to the design and construction of sprayed concrete lined (SCL) tunnels. The complex behaviour of the early age behaviour of the sprayed concrete requires careful management. This book covers all aspects of SCL tunnelling – from the constituents of sprayed concrete to detailed design and management during construction. Although there is a close interdependence between all the facets of sprayed concrete, few engineers have the right breadth of experience and expertise, and this urgently needs to be transferred to the wider engineering community. Disseminating essential information for tunnelling engineers, Sprayed Concrete Lined Tunnels is key reading for all involved in or studying the process.

Download or read book Environmental Hydraulics and Sustainable Water Management Two Volume Set written by J.H.W. Lee and published by CRC Press. This book was released on 2004-12-15 with total page 2342 pages. Available in PDF, EPUB and Kindle. Book excerpt: This two-volume set, with cd-rom, comprises the Proceedings of the 4th International Symposium on Environmental Hydraulics & the 14th Congress of Asia and Pacific Division, International Association of Hydraulic Engineering and Research held in December 2004 in Hong Kong. Volume 1 covers the selected papers presented at the 4th Internation

Download or read book Calculation of the Buoyant Motion of a Turbulent Planar Heated Jet in an Opposing Air Stream written by Milton M. Klein and published by . This book was released on 1978 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: A broad experimental and theoretical program is being conducted to aid in the development of an operational warm fog dispersal system which utilizes momentum driven ground based heat sources. To help determine optimum heat and thrust combinations for the system, investigations are being made of the buoyant motion of heated turbulent jets both coflowing (wind and jet in the same direction) and counterflowing (wind and jet opposite). The investigation of the coflowing jet has been completed and in addition a model has been developed from which the dynamic characteristics of a heated counterflowing jet in the absence of buoyancy can be calculated. The present investigation is concerned with the effect of buoyancy upon the motion of a counterflowing jet. The lower portion of the trajectory, which has been calculated by the present model, is in fair to good agreement with the corresponding experimental curve, the calculated curve tending to be somewhat higher than that obtained experimentally. The calculated upper part of the trajectory, obtained from a model which gives the deflection of a jet in a crosswind, is in good agreement with experiment.

Download or read book Engineering Turbulence Modelling and Experiments 4 written by D. Laurence and published by Elsevier. This book was released on 1999-04-14 with total page 975 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings contain the papers presented at the 4th International Symposium on Engineering Turbulence Modelling and Measurements held at Ajaccio, Corsica, France from 24-26 May 1999. It follows three previous conferences on the topic of engineering turbulence modelling and measurements. The purpose of this series of symposia is to provide a forum for presenting and discussing new developments in the area of turbulence modelling and measurements, with particular emphasis on engineering-related problems. Turbulence is still one of the key issues in tackling engineering flow problems. As powerful computers and accurate numerical methods are now available for solving the flow equations, and since engineering applications nearly always involve turbulence effects, the reliability of CFD analysis depends more and more on the performance of the turbulence models. Successful simulation of turbulence requires the understanding of the complex physical phenomena involved and suitable models for describing the turbulent momentum, heat and mass transfer. For the understanding of turbulence phenomena, experiments are indispensable, but they are equally important for providing data for the development and testing of turbulence models and hence for CFD software validation.

Download or read book Proceedings of the 5th International Conference on Jets Wakes and Separated Flows ICJWSF2015 written by Antonio Segalini and published by Springer. This book was released on 2016-07-18 with total page 603 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume collects various contributions from the 5th International Conference on Jets, Wakes and Separated Flows (ICJWSF2015) that took place in Stockholm during June 2015. Researchers from all around the world presented their latest results concerning fundamental and applied aspects of fluid dynamics. With its general character, the conference embraced many aspects of fluid dynamics, such as shear flows, multiphase flows and vortex flows, for instance. The structure of the present book reflects the variety of topics treated within the conference i.e. Jets, Wakes, Separated flows, Vehicle aerodynamics, Wall-bounded and confined flows, Noise, Turbomachinery flows, Multiphase and reacting flows, Vortex dynamics, Energy-related flows and a section dedicated to Numerical analyses.

Download or read book Engineering Fluid Dynamics 2019 2020 written by Bjørn H. Hjertager and published by MDPI. This book was released on 2021-02-25 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the successful submissions to a Special Issue of Energies entitled “Engineering Fluid Dynamics 2019–2020”. The topic of engineering fluid dynamics includes both experimental and computational studies. Of special interest were submissions from the fields of mechanical, chemical, marine, safety, and energy engineering. We welcomed original research articles and review articles. After one-and-a-half years, 59 papers were submitted and 31 were accepted for publication. The average processing time was about 41 days. The authors had the following geographical distribution: China (15); Korea (7); Japan (3); Norway (2); Sweden (2); Vietnam (2); Australia (1); Denmark (1); Germany (1); Mexico (1); Poland (1); Saudi Arabia (1); USA (1); Serbia (1). Papers covered a wide range of topics including analysis of free-surface waves, bridge girders, gear boxes, hills, radiation heat transfer, spillways, turbulent flames, pipe flow, open channels, jets, combustion chambers, welding, sprinkler, slug flow, turbines, thermoelectric power generation, airfoils, bed formation, fires in tunnels, shell-and-tube heat exchangers, and pumps.

Download or read book An Experimental and Numerical Investigation of a Turbulent Round Jet Issuing Into an Unsteady Crossflow written by 夏麗萍 and published by Open Dissertation Press. This book was released on 2017-01-26 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "An Experimental and Numerical Investigation of a Turbulent Round Jet Issuing Into an Unsteady Crossflow" by 夏麗萍, Liping, Xia, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. DOI: 10.5353/th_b3123789 Subjects: Unsteady flow (Aerodynamics) Jets - Fluid dynamics

Download or read book Advances in Turbulence 3 written by Arne V. Johansson and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 541 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book covers the following main topics: turbulence structure, transition, dynamical systems in relation to transition, turbulent combustion and mixing, turbulence affected by body forces, turbulence modeling, drag reduction, and novel experimental techniques.