Çankaya GCRIS Standart veritabanının içerik oluşturulması ve kurulumu Research Ecosystems (https://www.researchecosystems.com) tarafından devam etmektedir. Bu süreçte gördüğünüz verilerde eksikler olabilir.

İnşaat Mühendisliği Bölümü Yayın Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12416/395

Browse

Browsing İnşaat Mühendisliği Bölümü Yayın Koleksiyonu by Subject "Air Entrainment"

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • Thumbnail Image
    Article
    Citation Count: Taştan, K., Yıldırım, N. (2018). Effects of intake geometry on the occurrence of a free-surface vortex. Journal Of Hydraulic Engineering, 144(4). http://dx.doi.org/10.1061/(ASCE)HY.1943-7900.0001439
    Effects of intake geometry on the occurrence of a free-surface vortex
    (ASCE-AMER Soc Civil Engineers, 2018) Taştan, Kerem; Yıldırım, Nevzat; 43229; 12654
    Both the profile and orientation of an intake entrance basically determine the characteristics of the flow (especially the velocity distribution and therefore the hydraulically developed subsurface depressions) toward the intake. The profile and orientation of the intake affect (1)the process of accumulation and growth of vorticity (circulation) along the pathway axis of the swirling vortex from the free surface to the intake; (2)position of the pathway of the swirling-vortex filament; and (3)location of the point of entry of the free-surface or subsurface vortex at the entrance of the intake. Test results indicate that the intake-entrance profile has limited effects on the occurrence of the air-core vortex and critical submergence. Regardless of the profile of the intake entrance, one common physical mechanism exists for development of free vortices occurring at intake entrances of different profiles. It is proven that spherical sink surface sectors (SSSSs) are essential for the vortex to exist.
  • Thumbnail Image
    Article
    Citation Count: Taştan, K.; Yıldırım, N. (2023). "Improved Equations for the Profile of a Vertical Air-Core Vortex", KSCE Journal of Civil Engineering, Vol.27, No.5, pp.2030-2042.
    Improved Equations for the Profile of a Vertical Air-Core Vortex
    (2023) Taştan, Kerem; Yıldırım, Nevzat; 12654
    The available formulas for the profile of a vertical non-air-entraining vortex are not practical because they involve unknown parameters and need measurements of the local viscous-core radii across the height of the air-core vortex. Also, these formulas can not be used for the air-entraining vortices. In the present study, the available formulas involving unknown parameters were further improved. Findings are as follows. 1) the magnitudes of the unknown parameters vary across the height of the profile of the air-core vortex and they are the function of the ratio of the height of the air-core vortex to the submergence of the intake; 2) simple charts and formulas were obtained for the variations of the unknown parameters for the air-core vortices with and without an intake; 3) in lieu of the local viscous-core radius, the radius at the half-depth of the profile of the air-core vortex was used; 4) no laborious work of measurements are needed to determine the local viscous-core radii along the profile of the vortex; and 5) the improved formulas are in good agreement with available test data for the profiles of both the non-air-entraining and the air-entraining vortices with or without a vertically flowing downward intake.