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Modeling of Throttling Process inside Capillary Tube
Vinš, Václav ; Vacek, V.
Presented study is part of larger project focused on a design and testing measurements of unique cooling systems ntended to particle detectors built at CERN laboratory. Existing numerical model of a throttling process inside a capillary tube was extended by a solution of two metastable regions – superheated liquid flow and a two-phase metastable flow. The underpressure of vaporization was determined on the base of heterogeneous nucleation theory. The correlation was modified by using our experimental data measured on special testing capillary tube. Detailed analysis of the experimental data pointed on a negative effect of gas impurities on the throttling process.
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Jednoduchá numerická simulace vnitřní struktury částicového testu
Bartušek, Karel ; Fiala, P.
The basic configuration of the electron beam was verified in Institute of Scientific Instruments Academy of Sciences of the Czech Republic experimentally. We prepared the numerical model which is based on the particle theory. Actually, it respects classical Electrodynamics Material Wave Theory (MWT). Numerical results were evaluated. The second model was prepared in respect to theory of wave packet (Louis de Broglie) and solved again. Results of both models were the same in their quality, we evaluated electric field intensity E on the electron impact area, and they corresponded with results from experiments.
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Measurement of temperature characteristics of resistivity of Cu bulk
Bartušek, Karel ; Fiala, P.
This contribution brings results of numerical modeling during design of measurement method for determine of thermal characteristic of specific resistance of Cu bulk. Combine of numerical modeling and experimental verification brings very effective procedure during suggestion and application in cryogenic region. Result of this work are used in research activities of Czech Academy of Science, ISI-Brno.
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