Bir Kanalda Gözenekli Malzeme ve Kıvrımlı Duvarın Taşınımla Isı Transferi Üzerindeki Birleşik Etkisinin İncelenmesi

Abstract

Bu araştırmada, bir kanal içerisinde bulunan gözenekli bir ortamın ve kanalın üst duvarında bulunan yarım daire kesitlerin Darcian olmayan akış ve zorlanmış taşınımla ısı transferi üzerindeki birleşik etkisini incelemek amacıyla bir simülasyon gerçekleştirilmiştir. Oluşturulan modelin simülasyonu, boyutsuz kuramsal denklemlerinin COMSOL multiphysics programı (v.6.1) kullanılarak çözülmesiyle yapılmıştır. Yarım daire kesitlerinin yarıçapı (R), yarım daire kesitlerinin merkezleri arasındaki uzaklık (Lc), Reynolds sayısı (Re) ve Darcy sayısı (Da) gibi proses parametrelerinin taşınımla ısı transferi üzerindeki etkileri incelenmiştir. Sonuçlar, yarıçap, kesitler arası uzaklık ve Reynolds sayısının artmasıyla ısı transfer hızının arttığını göstermiştir. Maksimum ısı transfer hızı, yarıçapın, R = 0,75H, kesitler arası mesafenin, Lc = 9R, ve Reynolds sayısının Re = 200 olduğu durumda elde edilmiştir. Çalışmada elde edilen hız ve Nusselt sayısı için değerler, benzer çalışmalarda elde edilen değerlerle kıyaslanarak programın doğru sonuç verip vermediği kontrol edildi. Bu çalışmada elde edilen Nusselt sayısı değerleri, benzer çalışmalarda olduğu gibi, asimptotik biçimde azalarak 5 değerinde sabit kaldığı gözlendi. Mevcut çalışmanın sonuçlarının, daha önce bu konuda yapılmış çalışmaların sonuçlarıyla büyük ölçüde uyumlu olduğu bulunmuştur.

Keywords

• Zorlanmış taşınım
• Darsiyan olmayan akış
• gözenekli ortam
• yarı dairesel kesitler

Examination of Combined Effect of Porous Material and Corrugated Wall on Convection Heat Transfer in A Conduit

Abstract

In this research, a simulation was carried out to investigate the combined effect of the presence of a porous medium in a channel and semicircular sections on its upper wall on non-Darcian flow and forced convection heat transfer. The simulation of the created model was done by solving the dimensionless constitutive equations using the COMSOL multiphysics program (v.6.1). The effects of process parameters such as the radius of semicircular sections (R) and the distance between centers of semicircular sections (Lc), Reynolds number (Re) and Darcy number (Da) on the convection heat transfer were investigated. The results showed that the heat transfer rate increased with increasing radius, distance between sections, and Reynolds number. The maximum heat transfer rate was obtained at radius (R = 0.75H), distance between sections (Lc = 9R), and Reynolds number (Re = 200). The values for velocity and Nusselt number obtained in the study were compared with the values obtained in similar studies to check whether the program gave correct results. It was observed that the Nusselt number values obtained in this study, as in similar studies, decreased asymptotically and remained constant at the value of 5. It was found that the results of the present study were in good agreement with those of the previous related studies.

Keywords

• Forced convection
• Non-Darcian flow
• porous medium
• semi-circular sections

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