Multiple optical measurement techniques have been applied for the investigation of a propeller-wing wind tunnel model. The (half) wind tunnel model is equipped with a nine bladed propeller and its wing has active Coanda blowing over the whole span of the wing.
Particle Image Velocimetry not only allows visualizing the airflow around the bike and rider, but also accurately measures the flow in detail. Development engineers use these results to optimize the performance of bike and clothing and help André Greipel in this way to reach new sportive achievements.
COMTESSA stands for Camera Observation and Modelling of 4D Tracer Dispersion in the Atmosphere. COMTESSA’s vision is to elevate the theory and simulation of turbulent tracer dispersion in the atmosphere to a new level by performing completely novel high-resolution 4D measurements.
Large-volume volumetric flow experiments and their results: The first of these, investigating a thermal plume at low velocities (up to 0.35 m/s) demonstrates the abilities and requirements to reach volume sizes up to and probably beyond one cubic meter.
A novel approach to the evaluation of time resolved particle-based tomographic data is introduced. By seizing the time information contained in such datasets, a very fast and accurate tracking of nearly all particles within the measurement domain is achieved at seeding densities comparable to (and probably above) the thresholds for tomographic PIV.
A flow-through nacelle investigated at the Institute of Fluid Mechanics and Aerodynamics of the Universität der Bundeswehr in Munich.
The physical mechanism underlying this optically induced phase transition process is discussed. It is demonstrated that this phase change can, in principle, be used for an all-optical “write–read–erase” memory device.
Crystal nucleation is important to control the product properties in industrial crystallization processes. In this work, we propose a simple method to manufacture such devices from polycarbonate as an alternative to conventional chips made of poly (dimethylsiloxane).
General knowledge tells us that oil and water do not mix. However, if we understand the mixing of oil and water, we better understand the behavior of spilled coffee, we can predict how long it will take for paint to dry, four our glass of beer to lose its 'fizz' and we can understand why the olive oil and vinegar in out 'vinaigrette' indeed refuses to mix.
This work describes details to the principle, design and construction of the proton microscope as well as first measurements and simulations of essential components like magnetic lenses, a collimator and a scintillator screen.
Ellipsometry is a non-destructive, optical technique for surface characterization. Imaging Ellipsometry in particular combines traditional ellipsometry with optical microscopy and thus enables ellipsometric studies with a lateral resolution down to 1µm. Therefore, it is perfectly suited to study structured or very small samples such as MEMs, FETs, Biochips or flakes of 2D-Materials.