Horseshoe vortex formation and evolution in a single row plate fin and tube heat exchanger

Bu çalışmada; çift akışkanlı, karşı-akışlı, tek fazlı, dairesel boru ve borulara dik olarak yerleştirilen ve sürekli kanatçıklardan oluşan bir kompakt ısı eşanjöründe, laminar, türbülansa geçiş ve türbülanslı akış karakteristikleri, Re = 600, 7500, 4000 ve boyutsuz kanat açıklığı-silindir çapı oranı S = 0.365 için detaylı olarak araştırılmıştır. Elde edilen deneysel sonuçlardan, ısı esanjörü akım pasajında meydana gelen kompleks ve 3-boyutlu akış özellikleri ile ısı eşanjörünün ısı transfer performansı arasında sıkı bir ilişki olduğu ve Reynolds sayısının oldukça etkili olduğu gözlenmiştir.

Kanat borulu bir ısı eşanjörü içerisinde horseshoe vortex oluşumu ve gelişimi

In the present investigation, the attention is focused on a compact, extended surface, cross-flow, single phase, two-fluid heat exchanger with continuous plate fins attached perpendicularly to the outside of the circular tube. Laminar, transitional and turbulence characteristics of the flow for the plate fin and tube heat exchanger having non-dimensional fin spacing to cylinder diameter ratio of S = 0.365 are investigated in detail at Re = 600, 1500, and 4000. Experimental results show that complex 3-D flow characteristics in the heat exchanger flow passage strongly correlate with the heat transfer performance of these types of heat exchangers. It is also shown that formation and evolution of horseshoe vortex system strongly depend on the Reynolds number.

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