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Application of the opd method in a flow-field dynamics analysis
Uruba, Václav
The Oscillation Pattern Decomposition method (OPD) is applicable on the dynamical velocity vector fields of turbulent flow coming from either mathematical simulation (DNS) or from experiment using an appropriate technique (time-resolved PIV in most cases). The OPD method is based on idea of identification of patterns rated according to their stability of appearance.
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Fine set-up of the Ar-Ion laser and fibre loader
Konfršt, Jiří ; Kysela, Bohuš ; Chára, Zdeněk
Use of lasers in the measuring systems, which use LDA/PDA devices, expects good knowledge of physical characteristics of used light source namely for multicomponent measurements. This article is focused on the experimental parameter analysis of individually separated light wavelength from Ar-Ion plasma tube, working in multiline “ML” mode. The best laser source parameters: aperture size, power input and quality of the utilized separate wavelengths were obtained and beams were adjusted to the optical fibres.
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3D measurement of particle movement using one camera
Chára, Zdeněk ; Kysela, Bohuš
Article is focused on analysis of measuring 3D particle motion with one camera and light knife. The 3D spherical particle movement is measured using standard particle tracking method (two velocity components) combined with simple method based on light intensity of scattered light by the moving spherical particle.
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Interesting properties of microbubbles
Tesař, Václav
Paper investigates properties of very small, sub-millimetre sized gas bubbles in liquids,which are generated by oscillation produced by a fluiidic no-moving-part oscillato in the gas supply into the aerator. Of particular interest is the tendency of microbubbles to coalesce already while in immediate neighbourhood of the aerator exit. Another investigated property is oscillation driven by released surface energy. Autorr derived an equation describing the natural frequencty of the oscillation and with the help of this equation found interesting parameters of the processes, such as the amount of outside water that takes part in the oscillation and has a decisive role in the inertial properties of the variations of the microbubble shape.
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