TY - JOUR T1 - BORU DEMETİ ISI DEĞİŞTİRİCİLERİNDE FARKLI BORU ÇAPI KULLANIMININ AKIŞ VE ISI TRANSFERİNİ İYİLEŞTİRMEYE ETKİSİ TT - THE EFFECT OF USE OF DIFFERENT DIAMETER ON IMPROVEMENT OF FLOW AND HEAT TRANSFER IN TUBE BANK HEAT EXCHANGERS AU - Kuru, Muhammet Nasıf AU - Erdinç, Mehmet Tahir AU - Karasu, İlyas AU - Ünal, Şaban PY - 2023 DA - September DO - 10.17780/ksujes.1244995 JF - Kahramanmaraş Sütçü İmam Üniversitesi Mühendislik Bilimleri Dergisi JO - KSU J. Eng. Sci. PB - Kahramanmaras Sutcu Imam University WT - DergiPark SN - 1309-1751 SP - 625 EP - 636 VL - 26 IS - 3 LA - tr AB - Boru demeti ısı değiştiricilerinde, boruların içindeki akışkana çapraz yönde etrafından geçirilen başka bir akışkan ile ısı transferi gerçekleştirilir. Boru dışından çapraz yönde geçirilen akışkan çoğunlukla gaz akışkanlardır. Art arda yerleştirilen borularda, en fazla ısı transferi çoğu kez birinci boruda elde edilmektedir. Birinci borudan sonra ısı ve akış karakteristiği birbirine benzer hal almaktadır. Bu durumda, hız ve sıcaklık konturlarının tekrarlanması ile periyodik akış elde edilmiş olur. Ardışık olarak gelen borularda sınır tabakanın sürekli olarak yenilenmesini sağlamak, diğer borularda birinci borudaki gibi yüksek ısı transferi elde edilmesine imkân tanıyacaktır. Isı transferi iyileştirilirken en önemli sorun basınç düşümünün de artmasıdır. Bu çalışmada düzgün sıralı dizilişe sahip boru demetinde, art arda yerleştirilen dört farklı çaptaki borular kullanılarak, ısı transferinin arttırılması ve basınç düşümünün azaltılması amaçlarıyla sayısal optimizasyon yapılmıştır. Karşılaştırmalar, ısı transferi yüzey alanının sabit, borular arasındaki boyuna ve enine mesafelerin aynı olduğu varsayılarak yapılmıştır. Düzgün sıralı dizilişe sahip boru demetinde ardışık olarak yerleştirilen dört adet borunun çaplarının D_1=5 mm,D_2=15 mm,D_3=6 mm,D_4=14 mm olması durumunda ısı transferi %14.5 oranında artarken, basınç düşümü de %377 oranında artmıştır. KW - Boru demeti KW - farklı çaplarda borular KW - ısı transferi KW - basınç düşümü KW - optimizasyon N2 - In tube bank heat exchangers, heat transfer is carried out with another fluid which is passed around in the cross direction to the fluid inside the tubes. The fluid that passes through the outside of the tube in the cross direction is also mostly gas fluids. In tubes placed one after another, the highest heat transfer is usually obtained in the first tube. The heat and flow characteristics become similar to each other after the first tube. In this case, periodic flow is obtained by repeating the velocity and temperature contours. Ensuring that the boundary layer is constantly renewed in successive tubes allows obtaining high heat transfer in the other tubes, as in the first tube. While improving heat transfer, the most important problem is the increase in pressure drop. In this study, a numerical optimization was carried out in order to increase the heat transfer and reduce the pressure drop by using tubes of four different diameters placed in an in-line arrangement. Comparisons are made assuming that the heat transfer surface area is constant and the longitudinal and transversal distances between the tubes are the same. If the diameters of four tubes are placed successively where D_1=5 mm,D_2=15 mm,D_3=6 mm,D_4=14 mm, the heat transfer increases by 14.5% and the pressure drop increases by 377%. CR - Abolfathi, S., Mirabdolah Lavasani, A., Mobedi, P., & Salehi Afshar, K. (2021). Experimental study on flow around a tube in mixed tube bundles comprising cam-shaped and circular cylinders in in-line arrangement. 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