İnşaat Mühendisliği Bölümü / Department of Civil Engineering
Permanent URI for this collectionhttps://hdl.handle.net/11413/6820
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Browsing İnşaat Mühendisliği Bölümü / Department of Civil Engineering by Author "Aksel, Murat"
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Publication Analysis of Seismic Sloshing Displacements in Rectangular Liquid Storage Tanks with SPH Method(2018) Güray, Ersan; Aksel, Murat; YAZICI, GÖKHAN; 140840; 135845; 291826In this study, Smoothed Particle Hydrodynamics (SPH) method was used to model sloshing response of a rectangular tank subjected to horizontal earthquake base excitation. An experiment and a numerical study with ANSYS Fluent flow modeling software are performed to verify the outputs of the SPH model. The sloshing displacement profiles obtained from the SPH model closely matched the free surface displacements obtained from the experiment and the flow modeling software. The SPH model described in this study was highly efficient at capturing discontinuities and working with moving boundaries without having to re-mesh the model at each time step.Publication Effects of cylindrical and conical heights on pressure and velocity fields in cyclones(Elsevier Science Bv, Po Box 211, 1000 AE Amsterdam, Netherlands, 2016-07) Demir, Selami; Karadeniz, Aykut; Aksel, Murat; 174164; 32526Nine modifications of Stairmand high-efficiency type cyclone with various cylindrical and conical heights were used to investigate their effects on pressure drop and flow field within cyclones. An experimental setup was built and experiments were conducted on various cyclone geometries at inlet velocities ranging from 10 to 185 m/s. The body heights ranged from D to 2D (D being the diameter of the cyclone body), while the conical heights were between 2D and 3D. The experimental results were used to calibrate CFD (Computational Fluid Dynamics) model. Experimental results showed that the pressure drop ranged from 191 to 235 Pa and 690 to 920 Pa at the lowest and highest inlet velocities, respectively, and that pressure drop is a function of both cylindrical and conical heights with reduced pressure drops as cylindrical and/or conical heights increase. Maps showing the change in pressure drop with respect to cylindrical and conical heights were prepared and interpreted to determine optimum ratio of conical-to-cylindrical height for reduced pressure drop. Optimum ratio was found experimentally as between 1.67 and 2.5. CFD results agreed well with the experimental data and the results helped gain insights into complicated phenomena taking place in cyclones. CFD results showed that increased axial velocities at the lip of vortex finder distrub radial velocity profiles and that tangential velocities in the stabilized vortex can be as high 1.4 times the mean inlet velocity. Both findings indicate that collection efficiency of the cyclone may be influenced by the height of the cyclone. (C) 2016 Elsevier B.V. All rights reserved.Publication Membrane integrated process for advanced treatment of high strength Opium Alkaloid wastewaters(IWA Publishing, Alliance House, 12 Caxton St, London Sw1H0Qs, England, 2018-04) İnsel, Hayrettin Güçlü; Karagündüz, Ahmet; Aksel, Murat; Çokgör, Emine; Kör Bıçakçı, Gökçe; Özyıldız, Gökşin; Toroz, İsmail; Keskinler, Bülent; 110669; 52865; 10934; 112717; 265557; 21499; 51381In this study, an integrated aerobic membrane bioreactor (MBR)-nanofiltration (NF) system has been applied for advanced treatment of Opium processing wastewaters to comply with strict discharge limits. Aerobic MBR treatment was successfully applied to high strength industrial wastewater. In aerobic MBR treatment, a non-fouling unique slot aeration system was designed using computational fluid dynamics techniques. The MBR was used to separate treated effluent from dispersed and non-settleable biomass. Respirometric modeling using MBR sludge indicated that the biomass exhibited similar kinetic parameters to that of municipal activated sludge systems. Aerobic MBR/NF treatment reduced chemical oxygen demand (COD) from 32,000 down to 2,500 and 130 mg/L, respectively. The MBR system provided complete removal of total inorganic nitrogen; however, nearly 50 mgN/L organic nitrogen remained in the permeate. Post NF treatment after MBR permeate reduced nitrogen below 20 mgN/L, providing nearly total color removal. In addition, a 90% removal in the conductivity parameter was reached with an integrated MBR/NF system. Finally, post NF application to MBR permeate was found not to be practical at higher pH due to low flux (3-4 L/m(2)/hour) with low recovery rates (30-40%). As the permeate pH lowered to 5.5, 75% of NF recovery was achieved at a flux of 15 L/m(2)/hour.