Apparatus and Methods for Laser Doppler Electrophoresis.
Laser Doppler Velocimetry and high speed imaging in single phase flow showed a high turbulence level in the wake of the impeller blades, and recirculation cells at low flow rates. In gas-liquid conditions, we demonstrated that the bubble size varies within a pump stage, as break-up occurs at the impeller tip, and coalescence is dominant in the diffuser, especially because of recirculation. The.
A Doppler Global Velocimeter was set up in the frame of a PhD thesis. This velocimeter is optimized to carry out high accuracy, three component, time averaged planar velocity measurements. The anemometer was successfully applied to wind tunnel and test rig flows, and the measurement accuracy was investigated. A volumetric data-set of the flow field inside an industrial combustion chamber was.
The laser Doppler anemometry system (or LDA) consists of a first stage of laser beam transmission so that pairs of laser beams converge into an intersection point, representing the point of interest to be measured (flow containing seeding particles). At the same time, another stage occurs, which is characterized by the detection of scattered light radiation from the small intersection volume.
AbstractThe goal of this work was the investigation of the unsteady flow field existing at the exit of the impeller of a centrifugal compressor and the critical comparison of velocity measurements.
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 component, spatially-resolving laser-Doppler velocimetry (LDV) system.
Laser Doppler Velocimetry (LDV) is a non-contacting vibration technique capable of such measurements but vibration measurements on rotating structures using LDV have been shown to be ambiguous. The sensitivity of the measured velocity to other rotor vibration components can be significant enough to mask the intended vibration measurement entirely. This thesis examines the use of LDV for.
Lasers for Doppler Velocimetry Laser Doppler Velocimetry is a well established method for analysing particle movement at a single point, either in a gas or a liquid. This information is typically collected using two intersecting collimated laser beams. The beams intersect and interfere in the region for analysis. The particles passing through.