Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 71 for “"laser-Doppler velocimetry"”.
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Application of Laser-Doppler Velocimetry to the Study of Coagulation and Sedimentation
… of model colloidal systems was measured by laser-Doppler velocimetry. This technique allows for rapid stability tests of dilute suspensions which affords a great savings of material over standard methods. The relative stability of dilute polystyrene latex particle (0.198 (mu)m diameter) …
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Laser Doppler velocimetry measurements of particle velocity fluctuations in a concentrated suspension
… tensor would be more realistic. We used laser Doppler velocimetry (LDV) to make a set of experimental observations of particle velocity fluctuations arising from inter-particle collisions in a concentrated non-colloidal suspension under nearly homogeneous shear flow in a narrow-gap …
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Unsteady Flow Behaviors Generated by Three-Dimensional Lattice Geometries as Measured by Laser Doppler Velocimetry
… (HWA) data so that it can be used with laser Doppler velocimetry (LDV) data. Then, we investigated the unsteady flow behaviors in the channel obstructed by different types of 3D lattice geometries. Distinct behaviors of the pressure distribution and the turbulence development were …
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Development of an Experimental System to Generate and Characterize Supersonic Aerosol Particles Using Laser Doppler Velocimetry
… The particle velocity is measured using a laser doppler velocimeter at various positions between the exit of the nozzle and the surface of a metal substrate and found to have a maximum mean velocity of 700 m/s in helium and 350 m/s in air. The results of this thesis are used to characterize …
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A Study of Compressible Turbulent Free Shear Layers Using Laser Doppler Velocimetry (Supersonic Flow, Mixing, Recirculating)
… flow visualization, and two channel coincident laser Doppler velocimeter measurements were made. Streamwise component turbulence intensities were found to be comparable to incompressible mixing layer results which contrasts with the limited existing hot-wire anemometer data. Transverse velocity …
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Experimental investigation of the fluid velocity distribution in stirred tank reactors equipped with retreat-blade impellers using laser doppler velocimetry
… system was experimentally quantified using Laser Doppler Velocimetry (LDV), which is a non-intrusive experimental method used to determine the local velocity distribution (including its fluctuating component) in a fluid placed inside any transparent piece of equipment. Two different reactor …
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Experimental investigation of the mixing of an axial jet within a swirling flow, utilizing laser Doppler velocimetry and particle image velocimetry
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1995.
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Velocity Measurements for Turbulent Nonseparated Flow Over Solid Waves
Laser-Doppler velocimetry measurements have been made of nonseparated velocity fields over solid sinusoidal wavy surfaces. Time-averaged velocity and turbulent intensity data are given.
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Interaction between turbulent flow and saturated porous media
… simulations, flow visualisation experiments and laser Doppler velocimetry (LDV) measurements.
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Turbulent Separated Flow Over Wavy Surfaces
… flow over wavy surfaces is presented in which laser-Doppler velocimetry is demonstrated to be a useful technique for velocity and turbulence data acquisition. Time-averaged velocity, turbulent intensity, skewness, and flatness data are given.
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Turbulent flow through a rectangular channel
… channel. A two polarization, three beam He-Ne Laser-Doppler Velocimetry system was used. The water channel was specifically designed and constructed to facilitate these optical measurements. It had negligible vibration and flow oscillation. Its length was 200 channel heights, sufficient to …
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Development of Specialized Laser Doppler Velocimeters for High Resolution Flow Profile and Turbulence Spectral Measurements
… and be compact. Through recent advancements, laser Doppler velocimetry can now meet all of those requirements making it an important part of aerodynamicist's research toolbox. The first paper presented in this manuscript style thesis explains the development of an advanced three-velocity …
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Steady and unsteady cascade measurements
… compressor blades under high angles of attack. Laser-doppler velocimetry and flow visualization were used. A method was developed for inducing propagating stall and some triggered ensemble averaged velocity records were obtained. An inviscid model was developed in order to predict the separated …
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Experimental visualization of the near-boundary hydrodynamics about fish-like swimming bodies
… were performed up to Reynolds number 106 using laser Doppler velocimetry and particle imaging techniques. The turbulence in the boundary layer of a waving mat and swimming robotic fish were investigated. How the undulating motion of the boundary controls both the turbulence production and the …
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An experimental study of the effect of small particles on the fluid turbulence in fully developed flow of air in a horizontal pipe
… measurements for both phases were obtained using Laser Doppler Velocimetry; signal discrimination was accomplished through application of the Phase/Doppler principle. Measurements were performed in air containing spherical glass beads with a volume-mean diameter of approximately 45 $\mu$m and …
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Unsteady pressure and vorticity fields in blade-vortex interactions
… A two-component, three-beam Helium-Neon laser-Doppler Velocimetry system is used to take data in a water tunnel. Ensemble-averaged velocity fields are obtained in the region of the leading edge of the airfoil. Finite-difference algorithms were written to obtain vorticity and pressure in …
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Design and process/measurement for immersed element control in a reconfigurable vertically falling soap film
… accurate measurement still eludes those without Laser Doppler Velocimetry, order of magnitude Reynolds numbers can be estimated to describe the regime of controller inquiry.
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Hotwire measurements of the turbulent flow into a cascade of controlled-diffusion compressor blades
… (CD) blades in order to verify Laser Doppler Velocimetry (LDV) data taken in earlier studies. Measurements were conducted at a Mach number of .25, a Reynolds number of 711000 and an inlet flow angle of 48 degrees. Turbulence profiles obtained in the pitch-wise direction were …
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An experimental investigation of the effects of base bleed in axisymmetric supersonic flow
… and shadowgraph photography, and two-component laser Doppler velocimetry (LDV). The comprehensive LDV mean velocity and turbulence measurements obtained during this study provide valuable insight into the physics of the base bleed mechanism and constitute a benchmark data set to aid analytical …
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