Author: Mustafa Saim AtakanPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Measurement of Particle Size and Velocity by Laser Doppler Anemometry
Development of a Simplified Optical Technique for the Simultaneous Measurement of Particle Size Distribution and Velocity
Author: James Lee SmithPublisher:
ISBN:
Category : Laser Doppler velocimeter
Languages : en
Pages : 40
Book Description
Principles and Practice of Laser-Doppler Anemometry
Author: F. DurstPublisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 456
Book Description
Investigation of Simultaneous Measurement of Particle Size and Velocity in Gas-particle Two-phase Flow Using a Laser-Doppler Velocimeter
Author: Dana Gene AndrewsPublisher:
ISBN:
Category : Laser Doppler velocimeter
Languages : en
Pages : 154
Book Description
Particle Sizing Experiments with the Laser Doppler Velocimeter
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Measurement techniques for in-situ simultaneous measurements of particle size distributions and particle velocities using the dual beam laser Doppler velocimeter (LV) were analytically and experimentally investigated. This investigation examined the different signal characteristics of the LV for determination of particle size and particle velocity, simultaneously. The different size related signal components were evaluated not only singularly but also as simultaneous measurements to determine which characteristic, or combination of characteristics, provided the best measure of particle size. The evaluation concentrated on the 0.5 to 5 .mu.m particle size range, in which the LV light scattering characteristics are complex often non-monotonic functions of the particle size as well as functions of index of refraction, the laser light wavelength, laser intensity and polarization, and the location and response characteristics of the detector. Different components of the LV signal were considered, but analysis concentrated on Doppler phase, visibility and scatter-intensity because they show the greatest promise. These signals characteristics were initially defined analytically for numerous optical configurations over the 0.5 to 5 .mu.m diameter range with 0.1 .mu.m segmentation, for refractive index values from 1.0 to 3.0 with absorptive (imaginary) components varied form 0 to 1.0. Collector orientation and effective f/No., as well as fringe spacing, beam polarization and wavelength, were varied in this analytical evaluation. 18 refs., 42 figs., 5 tabs.
Application of a Laser-doppler Technique to the Measurement of Particle Velocity in Gas-particle Two-phase Flow
Author: Stanford University. Department of Aeronautics and AstronauticsPublisher:
ISBN:
Category :
Languages : en
Pages : 362
Book Description
In chemical propulsion, the use of metallic fuel constituents burning to particulate refractory oxides in rocket engines has forced attention to the understanding of two-phase nozzle expansion processes. In this study light from a helium-neon laser was reflected both from a fixed target and from moving particles. A lens concentrated the laser light and the light back-scattered from the particles was picked up by the same lens and directed into a Fabry-Perot scanning plate interferometer. The interferometer limited observation at any moment to those particles whose Doppler shifted frequency coincided with the interferometer transmission frequency. The light from the fixed target provided a frequency reference system, and calibrated movement of the interferometer mirror spacing provided continuous examination of velocity. Data in the form of lightscattering and number count vs velocity has been obtained for water droplets in subsonic flow, for aluminum spheres and alumina abrasive in cold supersonic flow and for aluminum and magnesium oxide in hot supersonic flow. Number count-velocity data was found to be a complicated function of particle size distribution and vector velocity distribution as well as instrument characteristics.
Optical Measurements
Author: Franz MayingerPublisher: Springer Science & Business Media
ISBN: 3662029677
Category : Science
Languages : en
Pages : 462
Book Description
Increasing possibilities of computer-aided data processing have caused a new revival of optical techniques in many areas of mechanical and chemical en gineering. Optical methods have a long tradition in heat and mass transfer and in fluid dynamics. Global experimental information is not sufficient for developing constitution equations to describe complicated phenomena in fluid dynamics or in transfer processes by a computer program . Furthermore, a detailed insight with high local and temporal resolution into the thermo-and fluiddynamic situations is necessary. Sets of equations for computer program in thermo dynamics and fluid dynamics usually consist of two types of formulations: a first one derived from the conservation laws for mass, energy and momentum, and a second one mathematically modelling transport processes like laminar or turbulent diffusion. For reliably predicting the heat transfer, for example, the velocity and temperature field in the boundary layer must be known, or a physically realistic and widely valid correlation describing the turbulence must be avail able. For a better understanding of combustion processes it is necessary to know the local concentration and temperature just ahead of the flame and in the ignition zone.
Laser Velocimetry and Particle Sizing
Author: Howard Doyle ThompsonPublisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 586
Book Description
Contents: A Historical Review of Laser Velocimetry. Developments in Instrumentation, Data Analysis, Combustion Measurements, Measurements in Turbulent Flows, Measurements in Internal Combustion Engines, General Applications, Particle Diagnostics, Wild Card Session, and Panel Discussion.
Application of a Laser Doppler Velocity Meter to Fluid Flow and Particle Size Distribution Measurements
Author: D. L. MorrowLaser Doppler and Phase Doppler Measurement Techniques
Author: H.-E. AlbrechtPublisher: Springer Science & Business Media
ISBN: 3662051656
Category : Science
Languages : en
Pages : 741
Book Description
Providing the first comprehensive treatment, this book covers all aspects of the laser Doppler and phase Doppler measurement techniques, including light scattering from small particles, fundamental optics, system design, signal and data processing, tracer particle generation, and applications in single and two-phase flows. The book is intended as both a reference book for more experienced users as well as an instructional book for students. It provides ample material as a basis for a lecture course on the subject and represents one of the most comprehensive treatments of the phase Doppler technique to date. The book will serve as a valuable reference book in any fluid mechanics laboratory where the laser Doppler or phase Doppler techniques are used. This work reflects the authors' long practical experience in the development of the techniques and equipment, as the many examples confirm.