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April 26, 2011
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April 26, 2011
Abstract
Using the astigmatism particle tracking method in connection with a long-range microscope enables highly temporal and spatial resolved measurements of the three dimensional velocity field in a fluid volume by a single camera. Thus, the complex interplay of magnetic field gradient force and the Lorentz force induced convective effects was analyzed experimentally for the first time.
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April 26, 2011
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This article describes a Micro-Particle-Image-Velocimetry measuring setup (Micro-PIV), which allows to measure the three-dimensional flow field inside a transparent 1:1 model of an original coronary stent. The treatment of the coronary heart disease is of utmost importance due to it´s high prevalence. Often coronary stents are implanted which lead to adverse effects originating from the altered blood flow through the vessel treated.
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This paper presents two different experimental approaches which concentrate on capturing the flow distribution close to the anode exit header of a prototype 8–12 KW fuel cell stack operated with air at realistic flow rates. The first approach intends to visualize the penetration depth of millimeter-sized jets towards the exit manifold. The second one is focused on obtaining the exit jet velocity field downstream of the bipolar plate exit header across the entire stack height by repeated 2C-PIV measurements on densely spaced adjacent light sheet planes. An overview of the experimental setup and the data evaluation is given.
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April 26, 2011
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We present a measurement technique that allows the determination of the velocity distribution of a micro-channel flow in the gas or liquid phase. Micro Particle-Image Velocimetry (μPIV) is a non-intrusive, laser-optical velocity measurement technique that is based on the determination of the displacement of small particles that are added to the flow. Especially in the gas phase μPIV strongly depends on particle characteristics like fluorescence, particle size distributions, and particle concentrations. The fidelity of the particles to adequately follow the flow is one of the key parameters of μPIV. The measurement technique is exemplarily applied in an optically transparent micro-channel with a 90° elbow to demonstrate the applicability of μPIV in a water flow as well as in a gaseous flow.
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April 26, 2011
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A miniaturised sensor system for aviation hydraulic fluids is presented. The system consists of an optochemical sensor and a particle sensor. The optochemical sensor detects the form of the O-H absorption feature around 3500 cm −1 to reveal the water and acid contamination in the fluid. The particle sensor uses a light barrier principle to derive its particle contamination number.
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April 26, 2011
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Terahertz time-domain spectroscopy is capable of detecting thin dielectric layers using pulse delay information. A new experimental geometry of a two-cylinder waveguide is applied to increase the system sensitivity by a factor of 150, extending the measurement range down to a thickness of 2.5 microns. Error estimations indicate that a sub-micron resolution is feasible. Even the thickness of dielectric layers on top of metal foils can be precisely determined.
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