Towards Full Field Scaling of the Centerline Behavior for Initially Turbulent Axisymmetric Jets PDF Download
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Author: G. Papadopoulos
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: G. Papadopoulos
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
Author: G. Papadopoulos
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: George Papadopoulos
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Category :
Languages : en
Pages :
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Author:
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Category : Fluid mechanics
Languages : en
Pages : 812
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Author: Mohamed El-Amin
Publisher: BoD – Books on Demand
ISBN: 9533073330
Category : Science
Languages : en
Pages : 642
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Book Description
This book introduces a number of selected advanced topics in mass transfer phenomenon and covers its theoretical, numerical, modeling and experimental aspects. The 26 chapters of this book are divided into five parts. The first is devoted to the study of some problems of mass transfer in microchannels, turbulence, waves and plasma, while chapters regarding mass transfer with hydro-, magnetohydro- and electro- dynamics are collected in the second part. The third part deals with mass transfer in food, such as rice, cheese, fruits and vegetables, and the fourth focuses on mass transfer in some large-scale applications such as geomorphologic studies. The last part introduces several issues of combined heat and mass transfer phenomena. The book can be considered as a rich reference for researchers and engineers working in the field of mass transfer and its related topics.
Author: G. Papadopoulos
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: American Institute of Aeronautics and Astronautics
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 530
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Category : Hydrology
Languages : en
Pages : 952
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Author:
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Category : Mechanics, Applied
Languages : en
Pages : 592
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 403
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Book Description
Near-field pressure and velocity measurements, along with multiple flow visualization techniques, were obtained at several azimuthal positions to establish the effect of initial conditions and Reynolds number on the development and nature of instabilitiues in the initial region of axisymmetric free jets. In cases where the exit boundary layer is laminar, the natural jet is found to be unstable alternately to axisymmetric and helical modes having Strouhal numbers of 0.013 and 0.016, respectively. The scaling of these modes is independent of Reynolds number and initial jet disturbance level. However, the disturbance level does not determine the sensitivity of the initial region to the helical mode. When the initial axisymmetric mode grows to a finite amplitude, a subharmonic resonance mechanism that leads to pairing develops two wavelengths from the jet exit. The axisymmetric and helical modes interact nonlinearly, generating numerous sum and difference modes. With the strong growth of the subharmonic mode, a secondary set of nonlinear interactions develops between the subharmonic mode and the above modes. A strong near-field pressure is associated with each of these instability modes and is coherent with the velocity fluctuations in the jet over the entire growth and decay regions of each mode. The details of this field reveal that pairing is not responsible for a feedback mechanism. This strong near-field pressure acts as a natural excitation to the jet. When the background disturbance is sufficiently low, a natural coupling is observed at special operating conditions where the initial modes are coupled to the mode observed near the end of the potential core of the jet.
