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İnşaat Mühendisliği Bölümü

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Browsing İnşaat Mühendisliği Bölümü by Journal "Arabian Journal for Science and Engineering"

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    Article
    Citation Count: Göğüş, M.; Gökmener, S. (2023). "Critical Submergence for Single and Multiple Horizontal Intake Structures", Arabian Journal for Science and Engineering, Vol.48, No.10, pp.13091-13115.
    Critical Submergence for Single and Multiple Horizontal Intake Structures
    (2023) Göğüş, Mustafa; Gökmener, Serkan; 6062
    In this study, a series of experiments were carried out to investigate the variation of the critical submergence of air-entraining vortices with the related flow and geometric parameters at single and multiple horizontal intake structures. Three identical intake pipes were tested at a wide range of discharges with varying sidewall clearances under symmetrical and asymmetrical approach flow conditions. Experimental results indicated that increasing the number of intake structures in operation results in a more complicated flow pattern in front of the intake structures due to the mutual effects of the intakes on each other. Therefore, critical submergence values are higher for multiple intake structures than those of single water intake structures for a given Froude number. Dimensionless empirical equations were derived for each single, double and triple unit operation to calculate the critical submergence as a function of relevant flow and geometric parameters, and they were compared with the related equations available in the literature. These equations can be used to determine sufficient submergence to avoid air-entraining vortices at single and multiple horizontal intakes within the ranges of dimensionless parameters tested in this study.
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    Article
    Citation Count: Taştan, Kerem; Koçak, Peli̇n Pınar; Yıldırım, Nevzat (2016). "Effect of the Bed-Sediment Layer on the Scour Caused by a Jet", Arabian Journal for Science and Engineering, Vol. 41, pp. 4029-4037.
    Effect of the Bed-Sediment Layer on the Scour Caused by a Jet
    (2016) Taştan, Kerem; Koçak, Peli̇n Pınar; Yıldırım, Nevzat; 12654
    Scour caused by a water jet impinging the bedsediment layer is a significant concern for hydraulic engineers. Although several studies investigated the maximum scour depth on the non-cohesive bed-sediment layer, the effect of the bed-sediment layer’s thickness on the scour was not studied. This study investigated the effect of the thickness of the non-cohesive sediment layer at the canal bed on the depth of the scour caused by a water jet. The dimensionless parameters affecting the depth of the scour were obtained via dimensional analysis. Experiments were conducted on two different, non-cohesive bed-sediment layers at the bottom of a rectangular canal for different jet Froude numbers. Experimental results indicated that the depth of the scour increases with the thickness of the bed-sediment layer; this is because as the thickness of the sediment layer increases, the penetration depth of the air bubbles (dragged and enforced by the impinging water jet) through the sediment layer just under the scour hole increases. Due to the buoyancy force, as the air bubbles rise upward, they apply uplift forces and dynamic effects onto sediment particles, dislodging, suspending, and carrying the sediment particles away from the bed. If the thickness of the sediment layer is increased beyond a limiting value for a given flow condition, the maximum depth of the scour does not change (it remains almost constant). The effect of the thickness of the bed-sediment layer on the depth of the scour is present but not excessively large.
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    Article
    Citation Count: Haspolat, Emre; Gogus, M. (2022). "Estimation of Critical Submergence at Single Horizontal Intakes Under Asymmetric Flow Conditions", Arabian Journal for Science and Engineering, Vol.47, No.10, pp.12509-12520.
    Estimation of Critical Submergence at Single Horizontal Intakes Under Asymmetric Flow Conditions
    (2022) Haspolat, Emre; Gogus, Mustafa; 6062
    Air-entraining vortices are one of the serious hydraulic phenomena which can create various problems during the operation of intakes. Generally, air-entraining vortices start to form when the intake submergence is insufficient and less than a critical value. The purpose of the present study is to investigate the formation of air-entraining vortices and determine the critical submergences at single horizontal intake under asymmetrical approach flow conditions by conducting experiments with four different pipe diameters. In the experiments, various sidewall clearances with a series of discharges were tested for a given pipe diameter to examine the effect of dimensionless flow and geometric parameters on the critical submergence. Based on dimensional analysis, empirical equations were derived to predict critical submergence by performing regression analyses of relevant dimensionless parameters. Scale effect analysis was also carried out to investigate the effect of neglected flow parameters on the critical submergence in the application of model similitude law. A formula that makes it possible to transform model results into prototype results in the range of tested parameters was derived and compared with similar studies mostly based on existing installations. Eventually, it was pointed out that the result of the model study underestimates critical submergence compared to others due to the scale effects. Moreover, it was determined that critical submergences at intakes having asymmetrical approach flow conditions are higher than those of symmetrical approach flows.