Opisano model opływomierza oscylacyjnego z hallotronowym czujnikiem częstotliwości dragań oscylatora, zbudowanego w Instytucie Techniki Cieplnej i Mechaniki Płynów Politechniki Wrocławskiej. Przedstawiono przykładowe charakterystyki metrologiczne oraz oszacowano niepewności pomiaru strumienia masy za pomocą tego typu przepływomierzy.
EN
The oscillatory flowmeter model with hall-effect oscillation frequency pick-up, built in Institute of Heat Engineering and Fluid Mechanics of Wrocław University of Technology has been described in this work. Metrological characteristics has been presented and gas flux measurement uncertainty of this flowmeter has been evaluated.
The penetration of magnetic induction into HTc superconductors has been considered taking into account the layered structure of these materials. For magnetic field parallel to the planes a one-dimensional penetration has been considered, while in perpendicular magnetic field it is a two-dimensional problem. The flux creep equation has been considered, whose solution was confirmed by experimental data measured on an Y-Ba-Cu-O sample. The magnetic diffusion equation has been solved for a description of the magnetic induction profiles in an increasing external magnetic field. The dynamic anomalies of the current-voltage characteristics have been then predicted, in agreement with experimental observations. The model taking into account the influence of the vortex-pinning center interaction on the magnetic field dependence of the critical current, has been also applied successfully for description of the anomalies.
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