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İnşaat Mühendisliği Bölümü Yayın Koleksiyonu

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

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Browsing İnşaat Mühendisliği Bölümü Yayın Koleksiyonu by Subject "Air-Core Vortex"

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    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.
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    Article
    Citation Count: Taştan, Kerem; Yıldırım, Nevzat (2021). "Occurrence of a swirling vortex without an intake", Gazi University Journal of Science, Vol. 34, no. 1, pp. 54-61.
    Occurrence of a swirling vortex without an intake
    (2021) Taştan, Kerem; Yıldırım, Nevzat; 12654
    In this study, mechanisms that cause the occurrence of a swirling vortex without an intake are explained. There are more than one different reasons which may cause the occurrence of an aircore vortex or a swirling-vortex flow filament within an ambient fluid. An air-core vortex or a swirling vortex flow filament can also occur in an ambient fluid media without an intake provided that the coaxial subsurface depressions and thereby the imaginary subsurface spherical sink surface sectors are hydraulically developed by any means (such as rotation of the fluid mass of spherical sector-form, impinging or penetrating jet flow, continuously entering solid body or string etc.). Although studies related to occurrence of a swirling vortex in case of an intake can be found in available literature, there are currently no studies which explains the occurrence mechanisms of a swirling vortex without an intake in detail. In this study, it is showed that the causes for the occurrence of the air-core vortex or the swirling vortex filament can be different but the main mechanism of development of the air-core vortex or the swirling vortex filament is identical for all cases. © 2021, Gazi Universitesi. All rights reserved.