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    Wyświetlanie 1-2 z 2
    Tytuł:
    CFD simulations for selection of appropriate blade profile for improving energy efficiency in axial flow mine ventilation fans
    Autorzy:
    Panigrahi, D. C.
    Mishra, D. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/91904.pdf
    Data publikacji:
    2014
    Wydawca:
    Główny Instytut Górnictwa
    Tematy:
    mine ventilation
    axial flow fan
    energy efficiency
    lift
    CFD
    drag
    wentylacja kopalń
    wentylator osiowy
    efektywność energetyczna
    winda
    Opis:
    Purpose This study focuses on one of the key design aspects of mine ventilation fans, i.e. the selection of an appropriate aerofoil blade profile for the fan blades in order to enhance the energy efficiency of axial flow mine ventilation fans, using CFD simulations. Methods Computational simulations were performed on six selected typical aerofoil sections using CFD code ANSYS Fluent 6.3.26 at angles of attack varying from 0 to 21 at an interval of 3 and at Reynolds number Re = 3 × 106, and various aerody-namic parameters, viz. coefficients of lift (Cl) and drag (Cd) as a function of angle of attack (α) were determined to assess the efficiency of the aerofoils. Results The study revealed that the angle of attack has a significant effect on the lift and drag coefficients and stall condition oc-curred at α values of 12 and 15 in most of the aerofoils. Based on the criterion of higher lift to drag ratio (Cl/Cd), a blade profile was chosen as the most efficient one for mine ventilation fans. Practical implications This study forms a basis for selecting appropriate blade profiles for the axial flow fans used for ventilation in mining industry. Originality/ value The application of an appropriate aerofoil blade profile will impart energy efficiency to the mine ventilation fans and thereby result in energy saving in mine ventilation.
    Źródło:
    Journal of Sustainable Mining; 2014, 13, 1; 15-21
    2300-1364
    2300-3960
    Pojawia się w:
    Journal of Sustainable Mining
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sources of radon and its measurement techniques in underground uranium mines – an overview
    Autorzy:
    Sahu, P.
    Panigrahi, D. C.
    Mishra, D. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/92136.pdf
    Data publikacji:
    2014
    Wydawca:
    Główny Instytut Górnictwa
    Tematy:
    underground uranium mine
    radon exhalation
    uranium-bearing ore
    backfill tailings
    mine water
    accumulation technique
    podziemna kopalnia uranu
    ekshalacja radonu
    rudy uranu
    wody kopalniane
    technika akumulacji
    Opis:
    Purpose This study aims to identify the potential sources of radon exhalation and its measurement in underground uranium mines to control the radiation levels within safe limits and protect miners from radiation hazards. Methods An extensive literature review on radon exhalation in underground uranium mines from various sources such as uranium ore, backfill tailings and mine water has been carried out. The influence of different important factors, viz. ore grade, porosity, grain size and moisture content on radon exhalation has been discussed in depth. Different methods for the measurement of radon exhalation from various sources in mines have also been presented in this paper. Results The review of literature revealed that the radon exhalation rate in porous uranium bearing rocks is less affected by the ore grade than in non-porous rocks. The exhalation of radon from backfill tailings is quantitatively more significant than from the uranium ore itself due to higher bulk porosity and enhanced surface area. Thus, porosity is the dominant factor that affects the rate of radon exhalation from rock surfaces into mine openings. Practical implications The knowledge of the sources of radon and quantitative estimation of radon from various sources will be very much useful in the planning and designing of ventilation systems in underground uranium mines. The accurate measurement of radon exhalation in underground uranium mines can be made by choosing the optimum size of accumulation chamber and a suitable radon build-up period in the chamber. Originality/ value The study portrays the important sources of radon and its measurement techniques in underground uranium mines based on an extensive literature review. The methods of measurement of radon exhalation from the ore body and backfill tailings in underground uranium mines, used by the authors of this paper, comparatively give more accurate results than previously used methods. Furthermore, the methods are more effective in terms of portability, cost and time for measuring the average radon exhalation across a large.
    Źródło:
    Journal of Sustainable Mining; 2014, 13, 3; 11-18
    2300-1364
    2300-3960
    Pojawia się w:
    Journal of Sustainable Mining
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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