Particle Field Clustering and Dynamics Experiments with Holographic Imaging PDF Download
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Author: Jeremy Christopher De Jong
Publisher:
ISBN:
Category :
Languages : en
Pages : 174
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Book Description
?Pub Inc Collision and coagulation processes of inertial particles suspended in turbulence are of considerable significance in a wide variety of both natural and industrial flows. Due to the complex nature of these processes, they are typically studied through the use of direct numerical simulations (DNS). However, these exists a pressing need to experimentally validate the DNS results. In this regard, we utilize digital particle holography to study a dynamic particle field in a stationary, homogenous and isotropic turbulent flow and evaluate important collision parameters such as the radial distribution function (RDF) and the radial relative velocity probability density function (PDF). We compare the experimental results with those obtain by DNS under similar flow and particle conditions and define correction factors that must be applied to the DNS to account for limitations and uncertainties inherent in experimental measurements. These factors include correction for the limited experimental volume, a polydisperse particle size distribution, lower dimensional measurements and uncertainties in the measured particle locations. Additionally, we defined a particle signature function that enhances the ability to distinguish real particles from noise in numerically reconstructed digital holograms and developed a method the uses inertial range fitting of the second order velocity structure function determine the dissipation rate inside a stationary turbulence chamber that allows complete characterization of the flow.
Author: Jeremy Christopher De Jong
Publisher:
ISBN:
Category :
Languages : en
Pages : 174
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Book Description
?Pub Inc Collision and coagulation processes of inertial particles suspended in turbulence are of considerable significance in a wide variety of both natural and industrial flows. Due to the complex nature of these processes, they are typically studied through the use of direct numerical simulations (DNS). However, these exists a pressing need to experimentally validate the DNS results. In this regard, we utilize digital particle holography to study a dynamic particle field in a stationary, homogenous and isotropic turbulent flow and evaluate important collision parameters such as the radial distribution function (RDF) and the radial relative velocity probability density function (PDF). We compare the experimental results with those obtain by DNS under similar flow and particle conditions and define correction factors that must be applied to the DNS to account for limitations and uncertainties inherent in experimental measurements. These factors include correction for the limited experimental volume, a polydisperse particle size distribution, lower dimensional measurements and uncertainties in the measured particle locations. Additionally, we defined a particle signature function that enhances the ability to distinguish real particles from noise in numerically reconstructed digital holograms and developed a method the uses inertial range fitting of the second order velocity structure function determine the dissipation rate inside a stationary turbulence chamber that allows complete characterization of the flow.
Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 840
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Book Description
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 702
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Book Description
Author: Chandra S. Vikram
Publisher: Cambridge University Press
ISBN: 9780521411271
Category : Science
Languages : en
Pages : 286
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Book Description
This is the first book to provide a thorough and systematic description of the entire subject of particle field holography. The use of holography to study very small objects in a dynamic volume is a technique of importance for scientists and engineers across a variety of disciplines for obtaining information about the size, shape and velocity of small objects, such as dust particles, fuel droplets, raindrops, pollen, and bubbles. Professor Vikram has made major contributions to the field, and here provides a coherent, comprehensive and self-contained treatment of the theory, practice and applications. The volume is written to satisfy the needs of researchers in the technique, practicing engineers dealing with applications, and advanced students in science or engineering departments. All the necessary mathematical formulations, figures and photographs, experimental procedures and results, and literature citations are therefore included.
Author: Max L. A. Gassend
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Shankar Subramaniam
Publisher: Academic Press
ISBN: 0323901344
Category : Technology & Engineering
Languages : en
Pages : 588
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Book Description
Modelling Approaches and Computational Methods for Particle-laden Turbulent Flows introduces the principal phenomena observed in applications where turbulence in particle-laden flow is encountered while also analyzing the main methods for analyzing numerically. The book takes a practical approach, providing advice on how to select and apply the correct model or tool by drawing on the latest research. Sections provide scales of particle-laden turbulence and the principal analytical frameworks and computational approaches used to simulate particles in turbulent flow. Each chapter opens with a section on fundamental concepts and theory before describing the applications of the modelling approach or numerical method. Featuring explanations of key concepts, definitions, and fundamental physics and equations, as well as recent research advances and detailed simulation methods, this book is the ideal starting point for students new to this subject, as well as an essential reference for experienced researchers. - Provides a comprehensive introduction to the phenomena of particle laden turbulent flow - Explains a wide range of numerical methods, including Eulerian-Eulerian, Eulerian-Lagrange, and volume-filtered computation - Describes a wide range of innovative applications of these models
Author: Chandra S. Vikram
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 636
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Book Description
Author: Aditya R. Nayak
Publisher: Frontiers Media SA
ISBN: 2889667693
Category : Science
Languages : en
Pages : 338
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Book Description
Author: H.R. Pruppacher
Publisher: Springer Science & Business Media
ISBN: 0306481006
Category : Science
Languages : en
Pages : 975
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Book Description
Cloud physics has achieved such a voluminous literature over the past few decades that a significant quantitative study of the entire field would prove unwieldy. This book concentrates on one major aspect: cloud microphysics, which involves the processes that lead to the formation of individual cloud and precipitation particles. Common practice has shown that one may distinguish among the following addi tional major aspects: cloud dynamics, which is concerned with the physics respon sible for the macroscopic features of clouds; cloud electricity, which deals with the electrical structure of clouds and the electrification processes of cloud and precipi tation particles; and cloud optics and radar meteorology, which describe the effects of electromagnetic waves interacting with clouds and precipitation. Another field intimately related to cloud physics is atmospheric chemistry, which involves the chemical composition ofthe atmosphere and the life cycle and characteristics of its gaseous and particulate constituents. In view of the natural interdependence of the various aspects of cloud physics, the subject of microphysics cannot be discussed very meaningfully out of context. Therefore, we have found it necessary to touch briefly upon a few simple and basic concepts of cloud dynamics and thermodynamics, and to provide an account of the major characteristics of atmospheric aerosol particles. We have also included a separate chapter on some of the effects of electric fields and charges on the precipitation-forming processes.
Author: Sangtae Kim
Publisher: Butterworth-Heinemann
ISBN: 1483161242
Category : Technology & Engineering
Languages : en
Pages : 537
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Book Description
Microhydrodynamics: Principles and Selected Applications presents analytical and numerical methods for describing motion of small particles suspended in viscous fluids. The text first covers the fundamental principles of low-Reynolds-number flow, including the governing equations and fundamental theorems; the dynamics of a single particle in a flow field; and hydrodynamic interactions between suspended particles. Next, the book deals with the advances in the mathematical and computational aspects of viscous particulate flows that point to innovations for large-scale simulations on parallel computers. The book will be of great use to students in engineering and applied mathematics. Students and practitioners of chemistry will also benefit from this book.
