Experimental Study of a Pulsating Round Impinging Jet PDF Download
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Author: Jiri Vejrazka
Publisher:
ISBN:
Category :
Languages : en
Pages : 117
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Book Description
The vortex structures in an impinging round jet and the possibility of their control by imposing small jet pulsations are studied. The jet flow is investigated by measurements of the velocity field, of the temperature field, of the instantaneous wall pressure profiles and of the local values of heat transfer coefficient at the wall. The results show that the primary vortices, which roll-up in the jet shear layer, induce an unsteady flow separation at the wall, prohibiting the heat transfer between the wall and the fluid jet. It is found that the vortex roll-up can be controlled by adding small amplitude modulation of the nozzle exit velocity. A certain modulation frequency is able to decrease the vortex circulation and hence to prevent the unsteady separation of the flow. The local heat transfer coefficient can be thus influenced by application of these velocity modulations.
Author: Jiri Vejrazka
Publisher:
ISBN:
Category :
Languages : en
Pages : 117
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Book Description
The vortex structures in an impinging round jet and the possibility of their control by imposing small jet pulsations are studied. The jet flow is investigated by measurements of the velocity field, of the temperature field, of the instantaneous wall pressure profiles and of the local values of heat transfer coefficient at the wall. The results show that the primary vortices, which roll-up in the jet shear layer, induce an unsteady flow separation at the wall, prohibiting the heat transfer between the wall and the fluid jet. It is found that the vortex roll-up can be controlled by adding small amplitude modulation of the nozzle exit velocity. A certain modulation frequency is able to decrease the vortex circulation and hence to prevent the unsteady separation of the flow. The local heat transfer coefficient can be thus influenced by application of these velocity modulations.
Author: Jonathan Newby
Publisher:
ISBN:
Category :
Languages : en
Pages : 278
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Book Description
Author: Dennis Wayne Potts
Publisher:
ISBN:
Category : Jets
Languages : en
Pages : 346
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Book Description
A round turbulent jet was impinged normally upon a circular cylinder and the resulting flow field was studied. The investigation was conducted using a jet which issued from a nozzle with an 11/16 inch diameter. The cylinder had a diameter of 6 5/8 inches. The jet impinged upon the cylinder at nozzle distances of 7, 15, and 30 nozzle diameters, and at velocities of 400 and 500 ft/s. The free jet was studied and found to be 'typical' by comparing it to earlier studies done with round turbulent jets. Surface flow visualization tests were performed to determine the direction of the flow. The wall jet about the cylinder, resulting from the impinging jet, was studied. Measurements of the velocity profiles and turbulence intensities were made. These results were compared to the same information obtained for flat plates and found to be similar for the nozzle distance of 7 diameters. At nozzle distances of 15 and 30 diameters the data was no longer similar. From velocity measurements, the spread rates and decay rates of the wall jet were determined. These results were compared to similar studies done for flat plates. Decay rates were found to be less than that of flat plates and spread rates were greater than that of flat plates, especially about the circumference of the cylinder.
Author: Ik-young Yun
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 248
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Book Description
Author: Norman S. Land
Publisher:
ISBN:
Category : Dust
Languages : en
Pages : 44
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Book Description
Author: Mohammad Mehdi Rashidi
Publisher: Elsevier
ISBN: 0443136262
Category : Technology & Engineering
Languages : en
Pages : 427
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Book Description
Nanofluids are a new class of heat transfer fluids engineered by dispersing and stably suspending nanoparticles in traditional heat transfer fluids. Recently they have obtained global attention from the scientific community owing to their unique properties and significant applications in different engineering fields. Nanofluids: Preparation, Applications and Simulation Methods provides a comprehensive review of recent advances in this important research field. Different approaches for preparing some remarkable families of nanofluids such as aluminum oxide-based nanofluids, CuO/Cu-based nanofluids, carbon nanotubes/graphene-based nanofluids, ZnO-based nanofluids, Fe3O4-based nanofluids, and SiO2-based nanofluids are discussed in detail as well as their current and potential applications. Different approaches for numerical, semi-analytical and analytical simulations are also discussed including molecular dynamics, the Lattice Boltzmann method, and spectral methods, as well as advanced analytical techniques such as the Differential Transform Method, the Homotopy Analysis Method, and Optimal Homotopy Analysis. The book will be a valuable reference resource for academic and industrial researchers, materials scientists and engineers, nanotechnologists, and chemists working in the development of nanomaterials and nanofluids for heat transfer in energy and engineering applications. Covers the synthesis of nanostructures, preparation of nanofluids, different applications and proposed models for fluid mechanics and heat transfer Presents recent advances on preparation methods, including green chemistry-based methods for preparation of nanomaterials and nanofluids Includes novel model-based approaches such as molecular dynamics and Lattice Boltzmann methods Delves into applications in renewable energy technologies and thermal management Contains a Semi-analytical approach for solving Time-Fractional Navier-Stokes Equation
Author: Dipendra Saharay
Publisher:
ISBN:
Category : Jets
Languages : en
Pages : 138
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Book Description
Author: Michael Gomon
Publisher:
ISBN:
Category :
Languages : en
Pages : 140
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Book Description
Author: George Earl Grant Sterling
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Eric Garnier
Publisher: Springer Science & Business Media
ISBN: 9048128196
Category : Science
Languages : en
Pages : 280
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Book Description
This book addresses both the fundamentals and the practical industrial applications of Large Eddy Simulation (LES) in order to bridge the gap between LES research and the growing need to use it in engineering modeling.
