Górnictwo i Geoinżynieria
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ISSN 1732-6702
Issue Date
2010
Volume
R. 34
Number
Nr 3/1
Description
Journal Volume
Górnictwo i Geoinżynieria
R. 34 (2010)
Projects
Pages
Articles
Model fazy dyskretnej przepływu powietrza z wykropleniem pary wodnej
(Wydawnictwa AGH, 2010) Branny, Marian; Nowak, Bernard; Ptaszyński, Bogusław; Kuczera, Zbigniew; Łuczak, Rafał; Życzkowski, Piotr
The paper describes the use of the discrete phase model to describe the movement of air in the vertical ventilation shafts with condensation of water vapor. Conditions under which discrete phase model can be used were verified and the results of performed calculations were presented. The results were obtained fo vertical movement up to the drops of water in the shaft.
Kształt pola prędkości w wyrobiskach przewietrzanych wentylatorami wolnostrumieniowymi - symulacja numeryczna przy użyciu lepkościowych modeli turbulencji
(Wydawnictwa AGH, 2010) Branny, Marian; Filek, Krzysztof; Nowak, Bernard
Room and pillar headings are frequently ventilated with the use of jet fans. The range of penetration of an air stream generated by the jet fan is determined by several parameters; the major determinants being the initial stream parameters and the place of fan's installation. The paper presents a method of calculation 3D velocity fields in room and pillar headings. Results obtained with the use of three turbulence models, it is two equations model k-l i k-u SST and one equation of Spalart-Allmaras. Calculation were compared with measurements [Meyer 1993].
Geomechaniczny model górotworu uwarstwionego
(Wydawnictwa AGH, 2010) Burtan, Zbigniew
Most studies exploring the influence of mining on the adjoining rock strata are based on theoretical solutions. Generally, analytical methods enabling us to find the stress and strain states have to be supported by various models of rock strata, and modelling normally involves simplifying assumptions. A typical assumption is that the rock strata should be treated as a continuous and homogeneous medium, which does not reflect its real structure. Typically, particular rock strata display entirely different geomechanical properties. This paper outlines the principles of creating a geomechanical model of stratified rock, enabling us to find components of stress tensor and displacement vector at an arbitrary point of the rock strata below the mined out level, for the given boundary conditions. The proposed mathematical tools might be well used in cognitive and applied studies.
Symulacja numeryczna powolnych przepływów płynów w ośrodku porowatym utworzonym przez regularny układ makroskopowych kul
(Wydawnictwa AGH, 2010) Filipek, Wiktor
In the paper the author has presented the application of CFD technique for the problem of the flow through a regular porous system consisting of repeating spheres. The virtual porous system has been created by author to simulate the flow through the genuine porous medium applied for hydrodynamic experiments. The results obtained from computer simulation have been compared to the results obtained by means of empirical investigations. The author has demonstrated that the results obtained by the techniques presented above are very similar. He also tried to determine parameters which enabled him to replace the empirical research by the computer simulations.
Zwalczanie zagrożenia temperaturowego w wyrobiskach górniczych chłodziarkami powietrza bezpośredniego działania typoszeregu TS
(Wydawnictwa AGH, 2010) Łuczak, Rafał
Problems connected with proper climatic conditions and opportunities of their improvement in terms of intensification of production, growth of depth and difficult geothermal conditions require a complex application of many means in order to assurance of suitable working conditions. The usage in polish mining the local refrigerating systems with direct action and with refrigerating power 300 kW and 350 kW is a leading solution of air treatment in the exploitation place. In this article parameters of work of direct action cooler located in the excavations of coal mine »Sosnica-Makoszowy« – »Makoszowy« were analyzed.