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RISS 인기검색어
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- 저자 : Aydin Durmus (검색결과 3 건)
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Ali Durmus,Mine Begum Alanalp,Ismail Aydin 한국유변학회 2019 Korea-Australia rheology journal Vol.31 No.2
Polyolefin blend type thermoplastic elastomers (TPEs) were prepared via melt blending method in a twin screw extruder by using isotactic polypropylene (i-PP), three different styrene-olefin triblock copolymers (SEBS-1 and SEBS-2 having a styrene content of 30 wt.% and 60 wt.%, respectively and SEEPS having a styrene content of 30 wt.%) and paraffinic oil. Composition-dependent and time-dependent viscoelastic properties of compounds were determined by various test procedures conducted in a rotational rheometer in melt state. It was found that the content of polystyrene blocks (or hard segment) in copolymers governed the rheological behaviors of compounds. It can be concluded that the increasing amount of styrene-olefin block copolymer or content of glassy domains into blend composition reduces miscibility between polyolefin and elastomer phases and also yields higher melt elasticity and viscosity, longer relaxation times, lower creep strain and compliance values at relatively longer time scale.
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Comparative study of turbulent flow around a bluff body by using two- and three-dimensional CFD
Ozdogan, Muhammet,Sungur, Bilal,Namli, Lutfu,Durmus, Aydin Techno-Press 2017 Wind and Structures, An International Journal (WAS Vol.25 No.6
In this study, the turbulent flow around a bluff body for different wind velocities was investigated numerically by using its two- and three-dimensional models. These models were tested to verify the validity of the simulation by being compared with experimental results which were taken from the literature. Variations of non-dimensional velocities in different positions according to the bluff body height were analysed and illustrated graphically. When the velocity distributions were examined, it was seen that the results of both two- and three-dimensional models agree with the experimental data. It was also seen that the velocities obtained from two-dimensional model matched up with the experimental data from the ground to the top of the bluff body. Particularly, compared to the front part of the bluff body, results of the upper and back part of the bluff body are better. Moreover, after comparing the results from calculations by using different models with experimental data, the effect of multidimensional models on the obtained results have been analysed for different inlet velocities. The calculation results from the two-dimensional (2D) model are in satisfactory agreement with the calculation results of the three-dimensional model (3D) for various flow situations when comparing with the experimental data from the literature even though the 3D model gives better solutions.
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Comparative study of turbulent flow around a bluff body by using two- and three-dimensional CFD
Muhammet Ozdogan,Bilal Sungur,Lutfu Namli,Aydin Durmus 한국풍공학회 2017 Wind and Structures, An International Journal (WAS Vol.25 No.6
In this study, the turbulent flow around a bluff body for different wind velocities was investigated numerically by using its two- and three-dimensional models. These models were tested to verify the validity of the simulation by being compared with experimental results which were taken from the literature. Variations of non-dimensional velocities in different positions according to the bluff body height were analysed and illustrated graphically. When the velocity distributions were examined, it was seen that the results of both two- and three-dimensional models agree with the experimental data. It was also seen that the velocities obtained from two-dimensional model matched up with the experimental data from the ground to the top of the bluff body. Particularly, compared to the front part of the bluff body, results of the upper and back part of the bluff body are better. Moreover, after comparing the results from calculations by using different models with experimental data, the effect of multidimensional models on the obtained results have been analysed for different inlet velocities. The calculation results from the two-dimensional (2D) model are in satisfactory agreement with the calculation results of the three-dimensional model (3D) for various flow situations when comparing with the experimental data from the literature even though the 3D model gives better solutions.
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