Górnictwo i Geoinżynieria
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ISSN 1732-6702
Issue Date
2008
Volume
R. 32
Number
Nr 3
Description
Journal Volume
Górnictwo i Geoinżynieria
R. 32 (2008)
Projects
Pages
Articles
Dwufazowy przepływ powietrza i wody w pionowych wyrobiskach górniczych
(2008) Branny, Marian; Filek, Krzysztof; Nowak, Bernard; Ptaszyński, Bogusław
The article describes examples of two-phase flows in mining excavations and its impact on ventilation systems. Author discusses some of flows features, parameters and its theoretical models. The article presents computational model of two-phase flows in vertical expiratory shaft, using Euler-Lagrange's method. Numerical simulations were performed with the discrete phase model implemented using computational fluid dynamics (CFD) software- Fluent. Calculations results presented in the form of graphs are enclosed.
Badania właściwości mechanicznych stali do produkcji dyskowych narzędzi urabiających dla górnictwa
(2008) Herezy, Łukasz
The disc cutting tools used in the past in longwall shearer has been withdrawn because of extremely high dynamic loading of its elements. Several positive aspects of these solutions are still topic of both theoretical and experimental works which are possible thanks a tremendous progress in thermal and chemise-thermal treatment of the steel. The paper presents results of multi variant investigations made at the laboratory of »Celsa« Steel Work, which have to help in receiving material with needed properties. The results of the research have to improve knowledge about construction of new machines for mining industry.
Charakterystyka zagrożenia klimatycznego w strefie przodkowej wyrobiska korytarzowego dla zmiennej lokalizacji chłodnicy powietrza
(2008) Kuczera, Zbigniew
The depth growth of exploited layers, concentration of coal and connected with this mechanization of kneading processes and transportation of carbon has influence on deterioration of climatical conditions, especially in main face heading. In spite of intensive ventilation, the mine face zone microclimate often gets worse. The air cooling allows improve climate conditions improvement for working crew. In the article, the author analyses changeability cooling power and the changing process of dry temperature, proper and relative humidity in coal face zone during shifted distance between cooler and ancestor's forehead.
Wpływ źródeł ciepła i wilgoci na stan zamglonego powietrza w podziemnych górniczych wyrobiskach korytarzowych
(2008) Nowak, Bernard; Filek, Krzysztof; Ptaszyński, Bogusław
In the article, a matter of haze air flow through horizontal dog heading is discussed. Equations of mathematical description of change the thermodynamic air parameters on the way of flow are given. In this case, appearance of different heat and moisture sources in the heading are taken into account. It was accepted that air can contain a moisture in form of water vapour and fog. For illustrating the discussed problems, the numerical examples for four variants of dates were solved. The results are presented in form of diagram of air temperature variation, its specific and relative humidity and contents of fog in function of running coordinate along the heading axis.
Wyznaczenie ugięć i sił przekrojowych w stropie będącym w kontakcie dwuparametrowym z pokładem dla wyrobiska korytarzowego
(2008) Paluch, Marian; Tajduś, Antoni
The paper presents the equations for calculating deflections, bending moments, and shear forces in the roof connected with the seam by two-parameter contact. The formulas for elastic energy and critical length of opening were also presented. The solution is applied to solve a practical example.