Browsing by Author "Ertunç, Özgür"
Now showing items 21-40 of 46
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Fluid flow characteristics inside convergent, divergent and straight open-end pressure swirl atomizer
Razeghi, Alireza; Ertunç, Özgür; Hacibekir, T.; Savci, İ. H. (Europe, Institute for Liquid Atomization and Spray Systems, ILASS, 2020)Effects of geometrical parameters on the performance of small-scale open-end pressure swirl atomizers (PSA) have been studied using computational fluid dynamics. The shape of the swirl chamber is the main geometrical feature ... -
From passive to active pitch regulation of wind turbines: Optimization method with numerical validation
Al-Abadi, A.; Kim, Y.; Park, J.-Y.; Kang, H.; Ertunç, Özgür; Delgado, A. (ASME, 2015)An optimization method that changes the control strategy of the Horizontal Axis Wind Turbine (HAWT) from passive- to active-pitch has been developed. The method aims to keep the rated power constant by adjusting the blade ... -
High-speed visualization of acoustically excited cavitation bubbles in a cluster near a rigid boundary
Vaidya, H. A.; Ertunç, Özgür; Lichtenegger, T.; Hachmann, J.; Delgado, A.; Skupin, A. (Springer Berlin Heidelberg, 2017)In the present work, high-speed visualizations at one million frames/s have been used to study the oscillation characteristics of acoustic cavitation bubbles. The bubbles are generated by acoustic cavitation using an ... -
Influence of turbulent flow characteristics on flame behaviour in diffuser combustors
Nazzal, Ibrahim Thamer; Ertunç, Özgür (Elsevier, 2019-03-01)The influence of turbulence on flame location in a diffuser-type combustor is the focus of this study. Two types of diffuser combustors were selected to study the influence of turbulence intensity and length scale on flame ... -
Interaction between free-stream turbulence and tip-vortices of wind turbine blades with and without winglets
Al-Abadi, A.; Kim, Y.; Ertunç, Özgür; Epple, P.; Delgado, A. (IOP Publishing, 2018)Experimental investigations of the free-stream turbulence impact on the tip-vortices generated in wind turbine blades have been performed. The investigation is done by exposing an efficient laboratory scale wind turbine ... -
An investigation into hydrophobic micro-textured surfaces on heat transfer and surface wetting phenomenon during vapor condensation
Salem, Thamer Khalif (2018-12-28)Efficiency and performance of a system that involves condensation process have been one of the primary considerations over the last decades for a number of applications including thermal management systems such as vapor ... -
Investigation of corrosion in oil pipelines through surface nano-treatment
Ahmed, Mohammed Salih (2020-01)Corrosion is the unintentional and degradation of a material caused by the reaction of that material with its environment and a natural possible hazard correlated with gas and oil generation and transportation facilities. ... -
Investigation of flame characteristics in a turbulent premixed combustion
Alhumairi, Mohammed Khudhair Abbas (2018-10)In this thesis, the turbulent flame closure (TFC) model and coherent flame model (CFM) of turbulent premixed flames as steady state flow are used. In addition, large eddy simulation (LES) model as unsteady state flow is ... -
Mass flow rate control of solenoid-based injectors
Qureshi, Muhammad Sarmad; Kara, Ahmet Burhan; Ertunç, Özgür; Bebek, Özkan (Sage, 2023)This paper presents a mass flow rate control method for solenoid-based injectors in open-loop, i.e. without physical sensor feedback. Measuring the mass flow rate in injectors is important because the performance of the ... -
Meso-scale cooling devices experimental and numerical heat transfer analysis
Parsa, Shadi Habibi (2017-01)Various thermal management strategies and related technologies are recently developed based on the specific needs, which they are designed to fulfill. Some of these technologies are muffin fans, synthetic jets, and ... -
Modeling and optimization of chemical mechanical polishing of semiconductor materials
Chemical mechanical polishing (CMP) is a process of planarization of metal and dielectric surfaces typically in microelectronic devices manufacturing. Planarization is achieved by removing material from the wafer surface ... -
A new model for predicting the required pressure difference for pressure swirl atomizers
Nural, Ozan Ekin; Ertunç, Özgür; Hacıbekir, T.; Savcı, İ. H. (Europe, Institute for Liquid Atomization and Spray Systems, ILASS, 2020)Prior to this study an investigation is made to analyze the accuracies of the semi-empirical correlations of the previous studies by comparing them with a large number of experimental data which is extracted from the works ... -
Numerical and experimental analysis of impinging synthetic jets for cooling a point-like heat source
Glowienko, G.; Derlien, H.; Ertunç, Özgür; Delgado, A. (ASME, 2018-05-01)High power light emitting diodes (LEDs) being used for low and high beam in automotive lighting need active cooling of their heat sinks by radial or axial fans. But the moving elements of the fan cause abrasion, noise, and ... -
Numerical and experimental analysis of the flow and transition of free synthetic jets
Glowienko, R.; Derlien, H.; Ertunç, Özgür; Delgado, A. (IOP Publishing, 2019-04)In this paper, flow characteristics and the transition of synthetic jets are investigated numerically and experimentally. The investigated synthetic jets have a dimensionsless stroke length L-0/d of 146 and 167, an U-0 of ... -
Numerical and theoretical analysis of external gear pump
İmamoğlu, Deniz (2019-01-28)External gear pumps are one of the mostly used pump types in the uid power applications due to simplicity, low cost and long operation period. However, there are some disadvantages such as internal leakages, noise and ... -
Numerical investigation of multiphase flow inside a pressure swirl atomizer at the initial stage of injection
Razeghi, Alireza; Ertunç, Özgür (Begell House Inc., 2018)Pulse-mode operating atomizers are widely used in industry. This paper presents the fluid flow details and characteristics inside a pulse-mode operating pressure swirl atomizer (PSA). Transient flow simulations are performed ... -
Numerical investigation of the flame location of turbulent premixed combustion in a diffuser burner exposed to various turbulence intensities and turbulence length scales
Nazzal, Ibrahim Thamer; Ertunç, Özgür (Turkish Society of Thermal Science and Technology (TIBTD), 2018)This study aims to investigate the response of the flame location of a turbulent premixed flame that has been exposed to various turbulence intensities and turbulence length scales. A diffuser-type burner is used to reveal ... -
The penetration of acoustic cavitation bubbles into micrometer-scale cavities
Vaidya, H. A.; Ertunç, Özgür; Lichtenegger, T.; Delgado, A.; Skupin, A. (Elsevier, 2016)The penetration of acoustically induced cavitation bubbles in micrometer-scale cavities is investigated experimentally by means of high-speed photography and acoustic measurements. Micrometer-scale cavities of different ... -
Predicting the performance of pressure-swirl atomizers
Nural, Ozan Ekin; Ertunç, Özgür (Begell House Inc., 2018)The purpose of this study is to evaluate the semiempirical correlations that are found in the literature by comparing them with all of the applicable experimental data that are also taken from the literature. Presentation ... -
Simulations of droplet impacts on hydrophobic moving walls
Heidarifatasmi, Hosein (2017-08)Numerical simulations of water drop impact onto hydrophobic surfaces (Wax, Teflon) are carried out through usage of Eulerian multiphase model. Volume of fluid (VOF) model is used to capture the deformation of the water ...
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