Sökning: "sub-critical"

Hittade 4 uppsatser innehållade ordet sub-critical.

  1. 1. Two-dimensional roughness and Tollmien-Schlichting waves: a study on transition

    Master-uppsats, KTH/Strömningsmekanik och Teknisk Akustik

    Författare :Derek Micheletto; [2020]
    Nyckelord :;

    Sammanfattning : Two-dimensional (2D) roughnesses induce premature transition to turbulence in laminar boundary layers by amplifying the disturbances in the flow and promoting the development of non-linearities. The present thesis aims at furthering our understanding of this phenomenon's underlying mechanisms and elucidating the effects of the different geometrical parameters of the roughness' cross section. LÄS MER

  3. 2. Steam driven boiler feed pumps for Lakvijaya Power Station, Sri Lanka

    Magister-uppsats, Högskolan i Gävle/Energisystem

    Författare :Buddhika Hasantha Wanasinghe; [2017]
    Nyckelord :steam driven; electric motor driven; BFP; coal; SRI LANKA; sub-critical;

    Sammanfattning : Energy saving in coal power plants is a popular topic in present days with the global energy crisis. Internal electricity demand or auxiliary power consumption is an energy portion related with equipment supportive to the main equipment, which is unavoidable but with a proper investigation, some amount of this energy can be saved either by introducing thermally efficient auxiliary equipment or improving efficiencies of available equipment. LÄS MER

  4. 3. Optimization of Physical Properties for Ditches–Case Study: Kankberg, Maurliden and Renström-Petiknäs.

    Master-uppsats, KTH/Mark- och vattenteknik

    Författare :Ghebriel Kidane Ketema; [2014]
    Nyckelord :Drainage system; Ditches; Open channel flow; Steep slope; Mild slope; HEC-RAS; Super-critical flow; Critical flow; Sub-critical flow;

    Sammanfattning : It is important for practical and legal reasons that water and sediments in disturbed areas around the mining operation should be controlled. The construction of a well-designed drainage system that controls erosion and thus restores the proper hydraulic function of the surface is one of the most important post-disturbance features which should be done as part of the mining activities. LÄS MER

  5. 4. Effects of vortex induced vibrationson cylinders in tandem configurationat critical Reynold numbers

    Master-uppsats, KTH/Aerodynamik

    Författare :Danny Nissan; [2014]
    Nyckelord :;

    Sammanfattning : Vortex-induced vibrations (VIV) and wake interference on circular cylinders have reached a lot of research attention over the years. However, most research is done for relativly low Reynold numbers (sub-critical) and does not correspond to real world chimney situations. LÄS MER