Cztery prace zaprezentowane na konferencji „Experimental Fluid Mechanics 2018", November 13-16, 2018, Prague, Czech Republic, opublikowano w internetowym periodyku „The European Physical Journal Web of Conferences”:
- Hanus R., Zych M., Wilk B., Jaszczur M., Świsulski D.: Signals features extraction in radioisotope liquid-gas flow measurements using wavelet analysis. The European Physical Journal Web of Conferences, Vol. 213, (2019), 02023. https://doi.org/10.1051/epjconf/201921302023
Abstract
Knowledge of the structure of a flow is significant for the proper conduct of a number of industrial processes. In this case, a description of a two-phase flow regimes is possible by use of the time-series analysis in time, frequency and state-space domain. In this article the Discrete Wavelet Transform (DWT) is applied for analysis of signals obtained for water-air flow using gamma ray absorption. The presented method was illustrated by use data collected in experiments carried out on the laboratory hydraulic installation with a horizontal pipe, equipped with two Am-241 radioactive sources and scintillation probes with NaI(Tl) crystals. Signals obtained from detectors for slug, plug, bubble, and transitional plug – bubble flows were considered in this work. The recorded raw signals were analyzed and wavelet energy was extracted using multiresolution analysis. It was found that energies of wavelet approximation at 1-5 levels are useful to recognize the structure of the flow.
2. Wilk B., Hanus R.: Blood flow in the brachial artery compressed by a cuff. The European Physical Journal Web of Conferences Vol. 213, (2019), 02099. https://doi.org/10.1051/epjconf/201921302099
Abstract
Most non-invasive blood pressure measurements are based on the blood flow during the arm cuff deflation. In this paper, the measurement system for an investigation of a blood flow in the partially occluded brachial artery is presented. It allows us to record simultaneously the cuff pressure, Korotkoff sounds and the blood flow during the arm cuff deflation. The algorithms developed for digital processing of the recorded signals are described in detail. The results of analysis obtained for healthy subjects are presented and discussed.
3. Zych M., Hanus R., Jaszczur M., Golijanek-Jędrzejczyk A., Świsulski D., Roshani G.H: Analysis and interpretation of radiometric signals in a liquid-gas bubble flow. The European Physical Journal Web of Conferences, Vol. 213 (2019), 02105. https://doi.org/10.1051/epjconf/201921302105
Abstract
The article presents the analysis of signals from a radiometric system consisting of two scintillation probes and two gamma radiation sealed sources. Calculations and interpretation were carried out for the bubble flow of the water-air mixture in the horizontal pipeline. The analysis of the obtained signals was done in time and frequency domain. In the frequency domain, a range of usable frequencies was identified, which were associated with changes in gamma-ray intensity recorded in the time domain. The gas phase velocity, void fraction and statistical parameters of the signal were also calculated.
- Golijanek-Jędrzejczyk A., Mrowiec A., Hanus R., Zych M., Świsulski D.: Determination of the uncertainty of mass flow measurement using the orifice for different values of the Reynolds number. The European Physical Journal Web of Conferences, 213, (2019), 02022. (https://doi.org/10.1051/epjconf/201921302022)
Abstract
Standard orifice flowmeters are widely used in the chemical and energy industry. Therefore, it is essential to know how accurate the measurements made with these instruments are. The paper presents an estimation of measurement uncertainty of a liquid mass flow using the orifice plate. The authors will present the influence of ranges of the Reynolds number on the estimated uncertainty, obtained on the basis of simulation and laboratory experiments. The research was conducted for the central orifice in the Reynolds number 8,000 < Re < 21,000. The results of estimating the extended uncertainty of the measurement of water flow using simulation and experimental method, are convergent. The maximum difference in the extended uncertainty values of flow measurement for the simulation and experiment was 0.04.10-3 kg/s.
