Browsing by Author "Ertunç, Özgür"
Now showing items 1-20 of 56
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3-D simulation of droplet impact on static and moving walls
Yılmaz, Anıl (2021-01-13)In the present study, the contact angle model and origin of the parasitic current have been studied to provide accurate prediction of droplet surface interactions in Volume of Fluid (VOF) framework. We investigate the ... -
3D simulation of droplet impact on static and moving walls
Yılmaz, Anıl; Kayansalçik, Gökhan; Ertunç, Özgür (Begell House Inc., 2022)In the present study, the contact angle model and the origin of the parasitic current, precisely, the relation of the parasitic current with grid distribution, have been studied to accurately predict droplet impact on ... -
Active-grid turbulence effect on the topology and the flame location of a lean premixed combustion
Alhumairi, Mohammed Khudhair Abbas; Ertunç, Özgür (Society of Thermal Engineers of Serbia, 2018)Lean premixed combustion under the influence of active-grid turbulence was computationally investigated, and the results were compared with experimental data. The experiments were carried out to generate a premixed flame ... -
Application of giesekus model for capillary extrusion of rubber compound
Talib, Nayyef Ahmed; Ertunç, Özgür (The Society of Chemical Engineers, 2019-02)Extrudate swell is an important phenomenon occurring when high viscoelastic materials, such as rubber and rubber compounds, are extruded. In this work, the effects of relaxation time and relaxation mode on swell predictions ... -
Augmenting occupant thermal experience with cyber-physical-social systems : a case study on adaptive vents
Keskin, Cem (2020-06-11)Buildings use more than 30% of global energy, while 36% of this energy comes from direct combustion of fossil fuels. Hence, buildings constitute a considerable share of CO2 emissions and has a large contribution to climate ... -
Automated flow rate control of extrusion for 3D concrete printing incorporating rheological parameters
Ahi, Oğulcan; Ertunç, Özgür; Bundur, Zeynep Başaran; Bebek, Özkan (Elsevier, 2024-04)The use of inline quality assessment technologies is of great importance in meeting the consistent extrusion requirements of 3D concrete printing (3DCP) applications. This paper presents a system to regulate extrusion speed ... -
Benchmark study of 2D and 3D VOF simulations of a simplex nozzle using a hybrid RANS-LES approach
Bal, M.; Kayansalçik, Gökhan; Ertunç, Özgür; Erhan Böke, Y. (Elsevier, 2022-07-01)In this study, a simplex nozzle is tested with water for the benchmarking of different flow simulation models. A large scale Plexi-glass transparent nozzle is used to reduce the influence of production tolerances on the ... -
Characterization of turbulence generated by an active grid with individually controllable paddles
Skeledzic, T.; Krauss, J.; Lienhart, H.; Ertunç, Özgür; Jovanovic, J. (Springer, 2018)An active grid with individually controllable paddles was constructed to generate strong turbulence (Reλ>200). Measurements of turbulence quantities using the hot-wire technique were conducted in a wind tunnel along the ... -
A Complete procedure for predicting and improving the performance of HAWT's
Al-Abadi, A.; Ertunç, Özgür; Sittig, F.; Delgado, A. (IOP Publishing, 2014)A complete procedure for predicting and improving the performance of the horizontal axis wind turbine (HAWT) has been developed. The first process is predicting the power extracted by the turbine and the derived rotor ... -
A coupled material removal model for chemical mechanical polishing processes
Akbar, Wazir; Ertunç, Özgür (IOP Publishing, 2021-10-01)Chemical mechanical polishing (CMP) is a process used to obtain planarized surfaces in microelectronic device manufacturing. The planarization is achieved by material removal from the wafer surface by synergistic effect ... -
A design and optimization method for matching the torque of the wind turbines
Al-Abadi, A.; Ertunç, Özgür; Weber, H.; Delgado, A. (AIP Publishing, 2015)An aerodynamic shape optimization method for a horizontal axis wind turbine is developed and verified through experimentation with a laboratory-scale wind turbine. Our method is based on matching the rotor's and the coupled ... -
Design, development, and real-life implementation of a high power quadruped robot
This thesis presents the design, development, and experimental test of a quadruped with high power-to-weight ratio. In this thesis, three design processes are studied, namely, actuator design, leg mechanism design and torso ... -
Determining thermal comfort in built environment using computational fluid dynamics simulations
Fidan, Güven (2017-06)In this thesis, three-dimensional time-dependent Thermal Comfort (TC) conditions in an occupied room is investigated and determined. The room is considered with furniture of varying materials (i.e. steel, wood, etc.) and ... -
Die-swelling phenomenon in rubber weatherstrip manufacturing under real process conditions imposed in a commercial extrusion line
Türkistanlı, Tarık (2021-06-11)The weather-strip manufacturers aim to reduce one of their main costs, trial scrap, to be competitive and to have a lower carbon foot. Annual scrap rates of sealing systems are mainly caused by extrusion dies and ... -
The effect of interface gradient distribution on unrealistic flow in 3D droplet simulations
Yılmaz, Anıl; Kayansalçik, Gökhan; Ertunç, Özgür (Europe, Institute for Liquid Atomization and Spray Systems, ILASS, 2021-08-31)The purpose of this study is to investigate the origin of the parasitic current to provide accurate prediction of droplet surface interactions in Volume of Fluid (VOF) framework. The deformation of the droplet due to ... -
Effect of pH on particle agglomeration and radiative transfer in nanoparticle suspensions
Al-Gebory, Layth Wadhah Ismael (2018-08)Nanoparticle suspensions (NPSs) are solid-fluid mixtures where small dielectric or metallic particles (with sizes <100 nm) used in a base fluid. NPSs have unique and tunable thermo-optical properties, and for that reason ... -
Effect of solar radiation in office spaces
Yelekci, Ali Can (2021-06-10)This thesis examines the design components of an office that influences the thermal comfort of the occupants due to solar radiation, such as external solar shades, various window glasses, partitions between desks and floor ... -
Effect of the motion pattern on the turbulence generated by an active grid
Herbert, M.; Skeledzic, T.; Lienhart, H.; Ertunç, Özgür (Springer, 2021)In the field of turbulence research, many experiments are performed using turbulence generated under reproducible conditions. In the past mostly static grids having a fixed blockage were adopted, but in order to generate ... -
Effects of turbulence intensity and length scale on the flame location of premixed turbulent combustion in a diffuser combustor
Nazzal, Ibrahim Thamer; Ertunç, Özgür (J-STAGE, 2017)This study focused on the dependency of the flame location of a premixed propane-air flame on turbulence intensity and length scale. The flame location was investigated using a diffuser-type combustor to show the response ... -
Evaluation of bioimplants surface nano-micro design by chemical mechanical polishing against alternative methods
Al Saeedi, Riaid Hadi Salih (2019-01-11)Biomaterials comprise a representative fraction of the products used in the health area. Biomedical devices (such as biosensors, blood circulation tubes, hemodialysis systems) can be cited as examples. Biomaterials can be ...
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