Effect of Different Winglets Designs on Flow and Heat Transfer in a Hybrid Corrugated Channel with Rectangular-Trapezoidal Profile

Öz

In this study, the effect of different winglet structures on flow and heat transfer in a rectangular-trapezoidal hybrid corrugated channel was numerically analyzed. The analyses were performed with the ANSYS Fluent software. The velocity and pressure relationship was solved with the SIMPLE algorithm. In the study, three different winglets, namely V-type, Y-type, and V-Y type (hybrid type), were placed in a rectangular-trapezoidal hybrid corrugated channel, and the Nusselt number, friction factor, and performance factor were calculated at Reynolds numbers of 2000 ≤ Re ≤ 10000. The results were compared with the hybrid corrugated channel without the winglet and the straight channel. According to the results, it was determined that heat transfer improved and pressure drop increased with increasing Re for all winglets. In the channels with winglet, it was found that the highest heat transfer at Re=10000 was obtained in the V-type winglet (Nu = 73.90) and the minimum pressure drop was obtained in the Y-type winglet (ΔP = 259.39 Pa). It was observed that the V-type winglet improved the heat transfer by 4.56 times compared to the straight channel and by 1.15 times compared to the hybrid channel without winglet.

Anahtar Kelimeler

• Hybrid corrugated channel
• Winglets
• Heat transfer imptovement

Dikdörtgen-Trapez Profile Sahip Hibrit Oluklu Bir Kanalda Farklı Kanatçık Tasarımlarının Akış ve Isı Transferine Etkisi

Öz

Bu çalışmada, dikdörtgen-trapez hibrit oluklu bir kanalda farklı kanatçık yapılarının akış ve ısı transferine etkileri sayısal olarak analiz edilmiştir. Analizler, ANSYS Fluent yazılımı ile gerçekleştirilmiştir. Hız ve basınç ilişkisi SIMPLE algoritması ile çözülmüştür. Çalışmada, dikdörtgen-trapez hibrit oluklu kanal içerisine V-tipi, Y-tipi ve V-Y tipi (hibrit tip) olmak üzere üç farklı kanatçık yerleştirilmiş ve 2000 ≤ Re ≤ 10000 Reynolds sayılarında Nusselt sayısı, sürtünme faktörü ve performans faktörü hesaplanmıştır. Sonuçlar, kanatçıkların olmadığı hibrit oluklu kanal ve düz kanal ile karşılaştırılmıştır. Sonuçlara göre tüm kanatçıklar için artan Re ile ısı transferinin iyileştiği ve basınç düşüşünün arttığı tespit edilmiştir. Kanatçıkların olduğu kanallarda, Re = 10000’de en yüksek ısı transferinin V-tipi kanatçıkta (Nu = 73,90) elde edildiği ve en az basınç düşüşünün Y-tipi kanatçıkta (ΔP = 259,39 Pa) olduğu bulunmuştur. V-tipi kanatçıkların ısı transferini düz kanala göre 4,56 kat, kanatçıkların olmadığı hibrit kanal göre 1,15 kat iyileştirdiği gözlenmiştir.

Anahtar Kelimeler

• Hibrit dalgalı kanal
• Kanatçıklar
• Isı transferi iyileştirme

Kaynakça

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