TY  - JOUR
T1  - FLOW AND FORCED HEAT TRANSFER FROM TANDEM SQUARE CYLINDERS NEAR A WALL
TT  - DUVAR YAKININDA ART ARADA YERLEŞTİRİLMİŞ KARE KESİTLİ SİLİNDİRLER ETRAFINDA AKIŞ VE ZORLANMIŞ TAŞINIM İLE ISI GEÇİŞİ
AU  - Yetik, Özge
AU  - Mahir, Necati
PY  - 2020
DA  - April
JF  - Isı Bilimi ve Tekniği Dergisi
PB  - Türk Isı Bilimi ve Tekniği Derneği
WT  - DergiPark
SN  - 1300-3615
SP  - 99
EP  - 112
VL  - 40
IS  - 1
LA  - en
AB  - In this study, the flow and heat transfer characteristics of two heated square cylinders in a tandemarrangement near a wall is investigated. The numerical computations are carried out by solving the unsteady twodimensional Navier-Stokes and energy equations. A fractional step method with Crank-Nicholson schema wasemployed to the convective and the viscous terms of the equations. At the inlet, fully developed laminar boundary layeris employed for longitudinal velocity over the plane wall while transverse velocity set to zero. The simulations areperformed for Prandtl number (Pr) of 0.71 and Reynolds number (Re) of 150 where the flow is considered twodimensional. The flow field characteristics and heat transfer depend not only on the ratio of the space between thecylinders (L/D) but also on the distance between the cylinder center and the wall (G/D). The vorticity and isothermcurves are generated and discussed for various L/D and G/D ratios to clarify the connection with flow and heat transfercharacteristics. When the cylinders are within the boundary layer formed on the plane wall, the large difference betweenthe velocities at the upper and lower side of the cylinders leads to noticeable variation at the flow and heat transfercharacteristics.
KW  - Heat Transfer
KW  - Numerical Simulation
KW  - Tandem square cylinders
KW  - Wall effect
N2  - Bu çalışmada bir duvar yakınında arka arkaya yerleştirilmiş ısıtılmış kare kesitli silindirler etrafındaki akışınkarakteristiklerini ve ısı geçişi incelenmiştir. Hesaplamalar zamana bağlı 2-boyutlu Navier Stokes ve enerjidenklemlerinin çözümü ile gerçekleştirilmiştir. Denklemlerin viskoz ve taşınım terimleri için Cranck-Nicholson şemasıile birlikte kısmi adımlar metodu kullanılmıştır. Girişte duvara paralel hız bileşeni için tam gelişmiş laminar sınır tabakakullanılmış, akışa dik yönünde hız bileşeni sıfır olarak alınmıştır. Simulasyonlar 0.71 Prandtl (Pr) sayısı ve akışın ikiboyutlu olduğu Reynolds (Re) sayısının 150 değeri için gerçekleştirilmiştir. Akış karakteristikleri ve ısı geçişi yalnızcasilindirler arasındaki uzaklık (L/D) ye değil aynı zamanda silindirlerin merkezi ile duvar arasındaki uzaklığa da (G/D)bağlıdır. Akış ve ısı geçişi arasındaki bağlantıyı ortaya çıkarmak için değişik L/D ve G/D oranları için çevrinti ve eşsıcaklık eğrileri elde edilmiş ve tartışılmıştır. Silindirler duvardan oluşan sınır tabakanın içerisinde kaldığında,silindirlerin üst ve alt yüzeyindeki hızlar arasındaki büyük fark akış ve ısı geçiş parametrelerinde önemli değişimlereneden olmuştur.
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UR  - https://dergipark.org.tr/tr/pub/isibted/issue//781641
L1  - https://dergipark.org.tr/tr/download/article-file/1244481
ER  -