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Influence of Local Gas Sources with Variable Density and Momentum on the Flow of the Medium in the Conduit

Author

Listed:
  • Bogusław Ptaszyński

    (Faculty of Civil Engineering and Resource Management, AGH University of Science and Technology, 30-059 Krakow, Poland
    Retired employee.)

  • Rafał Łuczak

    (Faculty of Civil Engineering and Resource Management, AGH University of Science and Technology, 30-059 Krakow, Poland)

  • Zbigniew Kuczera

    (Faculty of Civil Engineering and Resource Management, AGH University of Science and Technology, 30-059 Krakow, Poland)

  • Piotr Życzkowski

    (Faculty of Civil Engineering and Resource Management, AGH University of Science and Technology, 30-059 Krakow, Poland)

Abstract

In this article, the analysis of mechanical energy changes in a gas medium flow with stable and variable density was presented. To determine the energy losses, the various sources of momentum and mass were used, which had an influence on air flow through the conduit in the system without heat exchange with the environment. The occurrence of varying density gas flow in the conduit (caused by local inflow of mass and momentum) in inclined pipes generates a natural depression–internal mechanical energy. The local momentum sources can facilitate or hinder the gas flow through the conduit. This phenomenon often appears in the network of underground mine workings and in ventilation and air conditioning installations. The characteristic for gas flow through a pipe or mining excavation is the equivalent aerodynamic resistance, the value of which is influenced by the mass and momentum of local sources. This value determines the facilitation or difficulty in gas transport through a section of conduit in relation to the mass stream of the medium. In this article, the dependency of mass flow and gas momentum with different densities on the value of the gas medium flow resistance in the conduit was analyzed. On the basis of the obtained results, the loss of mechanical energy and energy efficiency of flows were determined. In this work, two cases of fan work in suction and blowing modes were analyzed. For these examples, a gas inflow with three different mass streams, a density higher than the main stream density, and with a zero momentum value for this stream was modeled. Ten cases of mass inflow sources were considered. The results of the gas mass flow calculation through the fan m ˙ w and gas m ˙ 0 and the coefficient of transport efficiency are graphically presented in the paper.

Suggested Citation

  • Bogusław Ptaszyński & Rafał Łuczak & Zbigniew Kuczera & Piotr Życzkowski, 2022. "Influence of Local Gas Sources with Variable Density and Momentum on the Flow of the Medium in the Conduit," Energies, MDPI, vol. 15(16), pages 1-14, August.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:16:p:5834-:d:885986
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    References listed on IDEAS

    as
    1. Wacław Dziurzyński & Andrzej Krach & Teresa Pałka, 2017. "Airflow Sensitivity Assessment Based on Underground Mine Ventilation Systems Modeling," Energies, MDPI, vol. 10(10), pages 1-15, September.
    2. Sharma, Sanjay K. & Kalamkar, Vilas R., 2016. "Computational Fluid Dynamics approach in thermo-hydraulic analysis of flow in ducts with rib roughened walls – A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 55(C), pages 756-788.
    3. Bogusław Ptaszyński & Zbigniew Kuczera & Piotr Życzkowski & Rafał Łuczak, 2022. "Transport Efficiency of a Homogeneous Gaseous Substance in the Presence of Positive and Negative Gaseous Sources of Mass and Momentum," Energies, MDPI, vol. 15(17), pages 1-11, September.
    Full references (including those not matched with items on IDEAS)

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