|
|
Evaluation of particle deposition rate in cement plant ductwork
Dorniak, Michal ; Kilkovský, Bohuslav (referee) ; Vondál, Jiří (advisor)
The submitted thesis deals with calculation of pressure drop in pipeline of cement industry, which is directly correlated with energy consumption of raw mill exhaust fans. The introduction in submitted thesis describes theoretical basics of cement production. Part of theoretical analysis is about detailed study of calculations of different friction factors. Separately for gas and separately for solids. In the practical part, a mathematical model of universal configuration of pipeline for pressure drop calculations was created. The last part evaluate impacts of pressure drop on energetic demands of raw mill exhaust fans.
|
|
|
Evaluation of particle deposition rate in cement plant ductwork
Dorniak, Michal ; Kilkovský, Bohuslav (referee) ; Vondál, Jiří (advisor)
The submitted thesis deals with calculation of pressure drop in pipeline of cement industry, which is directly correlated with energy consumption of raw mill exhaust fans. The introduction in submitted thesis describes theoretical basics of cement production. Part of theoretical analysis is about detailed study of calculations of different friction factors. Separately for gas and separately for solids. In the practical part, a mathematical model of universal configuration of pipeline for pressure drop calculations was created. The last part evaluate impacts of pressure drop on energetic demands of raw mill exhaust fans.
|
|
|
Experimental investigation of air pressure, acoustic characteristics and vibrations of vocal folds on a complex physical model of phonation in humans.
Horáček, Jaromír ; Radolf, Vojtěch ; Bula, Vítězslav ; Veselý, Jan ; Laukkanen, A. M.
The contribution aims to provide material that can be used in development of more realistic physical as well as theoretical models of voice production. The experimental set-up, methodology and the results of measurement of airflow rate, subglottal, oral and generated acoustic air pressures are presented together with the simultaneously measured flow-induced vibrations of a vocal folds replica, made of soft silicon rubber, and recorded by a high speed camera. The data were measured during a ‘soft’ phonation just above the phonation onset, given by the phonation threshold airflow rate, and during a ‘normal’ phonation for the airflow rate of about three times higher. A model of the human vocal tract in the position for production of vowel [u:] was used and the flow resistance was raised by phonating into a glass resonance tube either in the air or having the other end of the tube submerged under water, and by phonating into a narrow straw. The results for the pressures presented in time and frequency domain are comparable with the physiological ranges and limits measured in humans for ordinary phonation and for production of vocal exercises used in voice therapy.
|
|
|
Climatic wind tunnel for material and structures investigation
Král, Radomil ; Pospíšil, Stanislav
The paper deals with a description of the new climatic wind tunnel laboratory built in historical city Telcˇ. As a separate unit of the Institute of Theoretical and Applied mechanics of the Academy of Science of the Czech Republic, the tunnel will be used for fundamental research in engineering problems within civil engineering, architecture, heritage care and in other fields where wind effects appear along with further factors. The paper presents essential information about the interior layout of the tunnel together with description of advanced facilities serving for simulation of a strong wind, rain, freeze and solar heat radiation. Fundamental part of the paper is devoted to pressure losses determination. Using two different methods, the principal parts of the tunnel are designed taking into account both the optimal flow characteristics and flow resistance.
|
|
|
Flow resistance of simple 2D bodies in wide range of Reynolds numbers
Hoření, Bohumír ; Chára, Zdeněk
Paper presents results of numerical simulation of flow resistance of selected 2D bodies (flat plate, cylinder and cylinder of square cross section) with help of program Fluent 6 for Reynolds numbers in the range Re=0.5 - 5000000 and the simulations are compared with available experimental data. The aim of the paper was to determine regions where the numerical calculations could give reasonably results.
|
guest ::
