Yazar "Sarper, Buğra" seçeneğine göre listele

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  • Küçük Resim
    Öğe
    Mini kanallı bir ısı alıcıda yenilikçi engel konfigürasyonlarının termohidrolik performansa etkilerinin sayısal olarak araştırılması
    (2024) Türk, Döndü; Sarper, Buğra
    Bu çalışmada, yenilikçi yarı ve çeyrek küresel engel konfigürasyonların bir mini kanallı ısı alıcının termohidrolik performansa etkileri sayısal olarak incelenmiştir. Bu amaçla 0.0025 kg/s ile 0.0045 kg/s arasında 5 farklı soğutucu akışkan debi 4 farklı geometri için sayısal çalışmalar gerçekleştirilmiştir.Sayısal çalışmalar ANSYS Fluent 2021 R2 yazılımı ile gerçekleştirilmiştir.Yapılan çalışmalarda farklı konfigürasyonların hız ve sıcaklık alanlarına,ortalama Nusselt Sayısına,ısı alıcının performans katsayısına olan etkileri incelenmiştir. Sonuçlar incelendiğinde debi değeri arttıkça ısı alıcının soğutma performansının arttığı,kanal içindeki engellerin ısı transferi karakteristlerinde önemli etkisinin olduğu belirlenmiştir.
  • [ X ]
    Öğe
    Numerical Investigation of the Effects of Buoyancy and Inter-Surface Radiation on Jet Impingement Cooling of an Inclined Plate
    (Duzce University, 2024) Sarper, Buğra
    In this study, effects of buoyancy and inter-surface radiation on convective heat transfer from an inclined plate cooled by a slot jet are numerically investigated. The study is carried out between the values of jet Reynolds number (Re_j) 100 and 1000, and the Richardson number (Ri) varies between 0.1 and 10. Impact of inter-surface radiation on the overall heat transfer performance is analyzed for three emissivity (?=0.05-0.5-0.95) values of the target plate and confined surfaces and three different inclination angles (?=0°-5°-10°) of the target plate. The dimensionless nozzle-to-target plate spacing (H/D_j) equals to 4, and computations are performed assuming that air (Pr =0.71) is not participating for radiation. As a result of the study, it is determined that effect of buoyancy on the flow and heat transfer characteristics at high Richardson numbers cannot be neglected, while the increase in surface emissivity improves the overall heat transfer performance and inclination of the target plate significantly affects the heat transfer.
  • [ X ]
    Öğe
    The effect of bifurcation angulation on flow characteristics and hemodynamic indicators in an idealized left coronary artery
    (Elsevier B.V., 2024) Müftüoğulları, Ali; Süner, Münir; Sarper, Buğra
    Atherosclerosis is a pathological condition characterized by inflammation in the main arteries, which serves as the primary factor for the development of cardiovascular disease. This condition represents the prevailing medical and surgical issue. Clinically, consequences of this condition might include stroke, coronary artery and heart disease, or peripheral vascular disease. In this study, the hemodynamic effect of three different angulations is numerically analyzed on left coronary artery and constant degree of stenosis (DoS) which equals to 50 % is implemented on each branch of three models to create stenotic arteries. The idealized left main coronary artery (LM) is modeled with its primary branches, namely left anterior descending (LAD) and left circumflex (LCx). The bifurcation angulations between LAD and LCx are considered 30°, 75° and 120°. All numerical analyses are carried out in transient regime, blood is considered as a non-Newtonian fluid and the Carreau viscosity model is selected to describe the viscosity variation of blood. The outcomes of all numerical analyses revealed that the blood flow across the branches is closely related to bifurcation angle. Recirculation is vital in the post-stenotic regions of LAD and LCx, and velocity enhances its breadth. WSS is highest in the stenosis and carina regions. OSI values are greater in the post-stenotic LAD and LCx regions where recirculation and plaque development are more likely. Helical flow appears in the post-stenotic region of the LM when velocity is lowest and in the stenotic area when velocity is highest. © 2023 The Author(s)