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Showing 1 to 20 of 27 for “"Laser Doppler Anemometry"”.
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Digital signal processing techniques for laser-doppler anemometry
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1990.
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Laser Doppler anemometry measurements of a confined turbulent water jet with a uniform background flow
… streams was measured with a frequency shifted laser Doppler anemometer. The objective was to approximate a jet submerged in an ambient fluid of infinite domain by using a confined jet in a uniform coflow. The coflow prevents flow reversal outside the jet, but if the coflow velocity is not small …
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Experimental determination of the flow field velocity and strain rate in a laminar opposed flow H₂/air diffusion flame, via laser doppler anemometry
… two different operating flow rates, via the laser Doppler anemometer. The experimental results are used to assess current counterflow diffusion flame modeling approximations. The data shows that the radial velocity is approximately linear with radial coordinate, as assumed by most modelings. …
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Fluid Flow and Performance Characteristics of a Cyclone Separator Operating Under Side Stream Conditions
… investigation has involved flow visualisation, laser Doppler anemometry, computational fluid Dynamics, as well as both model particle tests and full scale prototype tests to quantify the effect of base suction and cyclone performance.<br/><br/>Flow visualisation has highlighted the extension of …
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LDA and CTA in-cylinder measurements of intake-generated turbulence for steady flow around a centrally located valve
… port. A single sensor Constant Temperature Anemometry (CTA) and a one-component Laser Doppler Anemometry (LDA) system were used to measure velocity profiles in the cylinder.;The LDA and CTA data agreed relatively well. Both showed a conical jet after the valve, which impacted the cylinder …
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Attachment mechanisms of a novel, targeted, lipid-based, ultrasound contrast agent
… calibrated to 50Pa wall shear stress (WSS) using laser Doppler anemometry (LDA). Higher WSS was achieved through the use of higher viscosity fluids. The streptavidin-biotin bond has been assessed within the flow chamber and was found to be 75 times stronger than an electrostatic control. Antibody …
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A computational and experimental investigation into the aeroacoustics of low speed flows
… cavity. Velocity measurements are made using the Laser Doppler Anemometry and Particle Image Velocimetry techniques. Instantaneous and statistical data are employed to probe the flows. Although coherent vortical structures are found to characterize the shear layer, their intermittent nature …
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Investigation of Fluid Flow in Grinding using LDA Techniques and CFD Simulation
… and shoe nozzle application are also presented. Laser Doppler Anemometry (LDA) was employed to obtain a basic understanding of the flow velocity profile in the region close to the grinding contact zone in a low speed grinding system and key characteristics of the fluid flow under varying grinding …
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Measurements of the structure of urban-type boundary layers
… Measurements were conducted with hot-wire anemometry, Laser Doppler anemometry, and particle image velocimetry. Development of the particle image velocimetry technique to obtain accurate turbulence statistics over and among the roughness elements was successfully undertaken providing …
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Spatial verification and validation of datasets in fluid dynamics
… metrology such as Particle Image Velocimetry and Laser Doppler Anemometry. A great deal of nodal data is generated by these techniques, which quantity may be expected to increase into the future. This data comprises uncertainties in both numerical modelling and experimental measurement, which …
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Melt Spinning of the Fine PEEK Filaments
… measurements. The fibre speed measured using Laser Doppler Anemometry and simultaneous temperature measured using infrared thermography enable both the strain rate and consequently the apparent extensional viscosity to be estimated. This provides the apparent extensional viscosity over the …
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Corner effects for oblique shock wave/turbulent boundary layer interactions in rectangular channels
… flow visualisation, Pressure Sensitive Paint and Laser Doppler Anemometry. A nominal freestream Mach number of 2.5 is used for all experiments with a unit Reynolds number of 40×10$^{6}$m$^{−1}$, and the shock-generator angle is set to 8°. The flow conditions are chosen to result in substantial …
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Flow patterns and energy dissipation rates in batch rotor-stator mixers
… and the simulation results were verified by laser Doppler anemometry (LDA) measurements. The agreement between predicted and measured velocity profiles in the bulk and of jet emerging from stator hole was very good. Results showed that the interaction between stator and rotating blades …
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The aerodynamics of a diffuser equipped bluff body in ground effect
… surface pressures, oilflow visualisation, laser doppler anemometry and particle image velocimetry. The 3D diffuser flow field has been measured for the first time and the results are used to analyse the behaviour of the diffuser in ground effect. Complementary RANS simulations provide …
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The effect of swirl on the heat transfer downstream of sudden axi-symmetric expansions in a circular duct
… heat transfer were<br/>investigated.<br/><br/>Laser Doppler Anemometry was initially employed to study the velocity field in the outlet pipe, particularly in the non-swirling case. Liquid crystal thermometry was utilised to obtain the variation in convective heat transfer coefficients on the …
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Improving the efficiency of domestic ovens
This project aimed to realise and validate a novel design of domestic oven to reduce cooking time and energy consumption compared to a traditional design of domestic oven. The design concept was developed by Dr Mark Williamson of Cambridge Oven Innovation (COI). Initially computational models were …
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An Experimental Study of Longitudinally Embedded Vortices in a Turbulent Boundary Layer via the Non-Invasive Comprehensive LDV Technique
… using through non-invasive Comprehensive Laser Doppler Velocimeter. The results show that normalization on edge velocity is appropriate for comparison with previous work. The 1/S parameter and vq^2 parameter were found to be most appropriate to correlate the Reynolds stresses and triple …
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Application of CFD in designing a drug delivery mixing chamber: an experimental and computational study
… a combination of engineering tools such as CFD, Laser Doppler Anemometry (LDA) and Row visualization techniques. The lack of information on the Volumatic /A/ spacer meant that, initial understanding had to be gained into the flow behaviour within the spacer. This was initially performed by …
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