Author: Jamaluddin Md SheriffPublisher:
ISBN:
Category :
Languages : en
Pages : 482
Book Description
Laser Doppler Measurements of Droplet Size and Velocity in a Vertical Upward Gas-liquid Annular Two-phase Flow
Author: Jamaluddin Md SheriffPublisher:
ISBN:
Category :
Languages : en
Pages : 482
Book Description
Laser Doppler Measurements of Droplet Size and Velocity in a Vertical Upward Gas-liquid Annualar Two-phase Flow
Author: Jamaluddin Md. SherriffMeasurement of Velocities in Gas-liquid Two-phase Flow Using Laser Doppler Velocimetry
Author: Publisher:
ISBN:
Category : Fluid dynamic measurements
Languages : en
Pages : 40
Book Description
International Journal of Fluid Mechanics Research
Author: Droplet Sizes, Dynamics and Deposition in Vertical Annular Flow
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The role of droplets in vertical upwards annular flow is investigated, focusing on the droplet size distributions, dynamics, and deposition phenomena. An experimental program was performed based on a new laser optical technique developed in these laboratories and implemented here for annular flow. This permitted the simultaneous measurement of droplet size, axial and radial velocity. The dependence of droplet size distributions on flow conditions is analyzed. The Upper-Log Normal function proves to be a good model for the size distribution. The mechanism controlling the maximum stable drop size was found to result from the interaction of the pressure fluctuations of the turbulent flow of the gas core with the droplet. The average axial droplet velocity showed a weak dependence on gas rates. This can be explained once the droplet size distribution and droplet size-velocity relationship are analyzed simultaneously. The surprising result from the droplet conditional analysis is that larger droplet travel faster than smaller ones. This dependence cannot be explained if the drag curves used do not take into account the high levels of turbulence present in the gas core in annular flow. If these are considered, then interesting new situations of multiplicity and stability of droplet terminal velocities are encountered. Also, the observed size-velocity relationship can be explained. A droplet deposition is formulated based on the particle inertia control. This permitted the calculation of rates of drop deposition directly from the droplet size and velocities data.
Development of a Laser Doppler Anemometer Technique for the Measurement of Two Phase Dispersed Flow
Author: Jagannathan SrinivasanPublisher:
ISBN:
Category : Laser Doppler velocimeter
Languages : en
Pages : 212
Book Description
Summary of Reported Droplet Size Distribution Data in Dispersed Two-phase Flow
Author: Raymond Virgil SmithPublisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 40
Book Description
Applied Mechanics Reviews
Author: Laser 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.
Laser-Doppler Velocimeter for Measuring Droplet Velocities in Two-phase Liquid-dominated Nozzle Flows
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
A new laser-Doppler velocimeter (LDV) arrangement for measuring droplet velocities in high velocity, liquid-dominated two-phase nozzle flows was developed. The transmitting optics arrangement for this LDV system is identical to that of a dual beam heterodyne LDV, i.e., the light beam from a single frequency argon laser is divided into two parallel identical beams, which are focused to an intersection volume in the flow. The light backscattered from droplets traveling through this volume is collected for analysis using a scanning confocal Fabry-Perot interferometer (FPI). Because of the dual beam arrangement an unscattered or reference beam is not necessary, and the optical alignment ease and stability are greatly improved over similar LDV-FPI systems. Results of droplet velocity measurements in high velocity, high droplet concentration nozzle jet flows are presented.