Developments in Laser Techniques and Applications to Fluid Mechanics -

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Résumé :
This volume comprises a selection of the best papers presented at the Seventh Interna? tional Symposium on Applications of Laser Techniques to Fluid Mechanics held at The Calouste Gulbenkian Foundation in Lisbon, during the period of July 11 to 14,1994. The papers describe Applications to Fluid Mechanics, Applications to Combustion, Instrumentation for Velocity and Size Measurements and Instrumentation for Whole? Field Velocity and demonstrate the continuing and healthy interest in the development of understanding of the methodology and implementation in terms of new instru? mentation. The prime objective of this Seventh Symposium was to provide a forum for the presen? tation of the most advanced research on laser techniques for flow measurements, and communicate significant results to fluid mechanics. The applications oflaser techniques to scientific and engineering fluid flow research was emphasized, but contributions to the theory and practice of laser methods were also considered where they facilitate new improved fluid mechanic research. Attention was placed on laser-Doppler anemometry, particle sizing and other methods for the measurement of velocity and scalar, such as particle image velocimetry and laser induced fluorescence. We would like to take this opportunity to thank those who participated. The assistance provided by the Advisory Committee, by assessing abstracts was highly appreciated.

Sommaire:
I Applications to Fluid Mechanics.- Low Reynolds Number Effects on the Inner Region of a Turbulent Boundary Layer.- Circular Couette Flow and Taylor Vortices in Shear-Thinning Liquids.- LDV Measurements of Confined Vortex Breakdown Generated by a Rotating Cone.- LDV-Measurements on Wide Gap Instabilities in Spherical Couette Flow.- Axial and Tangential Velocity Components at the Exhaust End of a Highly Complex Cyclonic Flow.- Mean Flow and Turbulence Measurements in a Rotating Passage Using a Stationary Fibre Optic LDA Probe.- Three-Dimensional Laser-Doppler Measurements in a Curved Flume.- Application of Laser Induced Fluorescence For Measuring the Thickness of Evaporating Gasoline Liquid Films.- Manifold Injection and the Origin of Droplets at the Exit of an Inlet Valve.- Phase-Doppler Anemometry (PDA); a New Tool for Monitoring Thermal Spraying.- II Applications to Combustion.- Characteristics of Counter-Gradient Heat Transfer in a Non-Premixed Swirling Flame.- Flame Structure Characterization Based on Rayleigh Thermometry and Two-Point Laser-Doppler Measurements.- Simultaneous Measurements of Temperature and OH Concentration Fields in Turbulent Combustion Using One Single Laser Source and One Single CCD Camera.- Structure of Spark-Ignited Spherical Flames Propagating in a Droplet Cloud.- III Instrumentation for Velocity and Size Measurements.- A Phase Screen Approach to Non-Particle Laser Anemometry.- Gaussian Beam Errors in Phase-Doppler Anemometry and Their Elimination.- Quantization of Doppler Signals: How many Bits are Needed?.- Direction Sensitive LDA Using a Single High-Frequency Pulsed Laser Diode and a Single Photodetector Without Frequency Shifting.- Measurements of Bubbles by Phase Doppler Technique and Trajectory Ambiguity.- Examination of the Rainbow Position of Optically Levitated Droplets for the Determination of Evaporation Rates of Droplets.- A New Technique to Measure Refractive Index With Phase Doppler Anemometry.- Simultaneous Determination of Temperature and Size of Droplets from the Rainbow Using Airy Theory.- A Rigorous Procedure for Design and Response Determination of Phase Doppler Systems.- Measurements of Size and Velocity of Arbitrarily Shaped Particles by LDA Based Shadow Image Technique.- IV Instrumentation for Whole-Field Velocity.- Interrogation and Validation of Three-Dimensional Vector Fields.- High-Speed 3-D Scanning Particle Image (3-D SPIV) Velocimetry Technique.- Multiple Light Sheet Particle Holography For Three-Dimensional Flow Velocimetry.- A Compact and Simple all Optical Evaluation Method for PIV Recordings.- A New Paradigm for Particle Tracking Velocimetry, Based on Graph-Theory and Pulsed Neural Network.- Precision Whole-Field Velocity Measurements With Frequency-Scanned Filtered Rayleigh Scattering.- Author Index.