Browsing by Author "Ertunç, Özgür"
Now showing items 21-40 of 56
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Experimental and numerical investigation of rubber whether strip extrusion
Talib, Nayyef Ahmed (2019-01-03)Extrusion is the main method used to produce rubber weather strips in automotive industries. The product quality is dependent on many factors, which include the design parameters of the die, the processing variables, and ... -
Experimental and numerical investigations on compact plate heat exchanger
Peçenek, Erdem (2019-08-15)The objective of this thesis was to understand ow phenomena inside chevron type plate heat exchangers. To reach this goal, several visualization experiments designed and conducted. Also Large eddy ow simulations were ... -
Experimental and numerical study of rubber flow in the extrusion die of a weather strip
Talib, Nayyef Ahmed; Ertunç, Özgür; Türkistanli, T.; Aydın, E. (Society of Chemical Engineers, 2019)Extrusion is the main method used to produce rubber weather strips in automotive industries, and the quality of the final product largely depends on the thermal properties of the process output. Therefore, precise thermal ... -
Experimental investigation of droplet impact on moving surfaces
Kayansalçık, Gökhan (2018-01)Droplet impact on moving surfaces has been studied experimentally by using high-speed photography technique. Fluid properties (droplet diameter and velocity), surface properties (wettability and roughness) and surface ... -
Flow visualization and LES simulations inside a chevron type plate heat exchanger
Peçenek, Erdem; Ertunç, Özgür; Senkal, C. (Begell House Inc., 2018)An up-scaled model of a single channel of CPHE was used under dynamically similar conditions for the experiments. In experiments, pressure drop measurements and flow visualizations were conducted with aluminum flitter and ... -
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 ... -
Investigation of soot formation of ethylene/air jet diffusion flame with rank correlated slw including ethylene and acetylene radiation
Halvaşi, Berkay; Başol, Altuğ Melik; Mengüç, Mustafa Pınar; Ertunç, Özgür (Begell House Inc., 2023)Radiation is significant, especially in sooting flames. The interaction between radiation and soot considerably affects the combustion regime. Spectral radiation models that account for the radiative effects of sooting ... -
Mass flow rate control of solenoid-based injectors
Qureshi, Muhammad Sarmad; Kara, Ahmet Burhan; Ertunç, Özgür; Bebek, Özkan (Sage, 2023-09)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 ... -
Model-based optimization of CMP process parameters for uniform material removal selectivity in cu/barrier planarization
Akbar, Wazir; Ertunç, Özgür (IOP Publishing, 2022-02-01)Chemical mechanical planarization is a process of achieving planar surfaces in the semiconductor manufacturing industry. The planarization of a surface is achieved by material removal from the wafer surface. The material ... -
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 ...
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