Dairesel Türbülatörler ile Asimetrik Trapez Dalgalı bir Kanalda Termohidrolik Performans Analizi

Abstract

Bu çalışma, içerisine dairesel türbülatörler yerleştirilmiş asimetrik trapez dalgalı bir kanalda türbülanslı akışın ısı transferini analiz etmektedir. Çözümlerde, ANSYS Fluent programı kullanılmıştır. Çözümlerde, standart k-ε türbülans modeli kullanılmıştır. Dairesel türbülatörler kanal içine 3 farklı çapta (d: 2 mm, 4 mm, 6 mm) ve 3 farklı konumda (t: 7 mm, 9 mm ve 11 mm) yerleştirilmiş ve her birinin akış ve ısı transferi üzerindeki etkileri incelenmiştir. Çalışmada, Reynolds sayısı 3000≤Re≤10000 aralığında değiştirilmiş ve kanalın asimetrik dalgalı yüzeyleri TS=340 K sıcaklığında sabit tutulmuştur. Kanal içine farklı çap ve konumlarda yerleştirilen türbülatörler için farklı Reynolds sayılarında Nusselt sayısı (Nu), iyileşme oranı (η), basınç düşüşü (ΔP) ve termohidrolik performans (THP) değerleri hesaplanmıştır. Ayrıca elde edilen sonuçlar, türbülatörlerin olmadığı asimetrik trapez dalgalı kanal ile karşılaştırılmıştır. Çalışma sonucunda, farklı parametrelerde kanal içinde hız ve sıcaklık görüntüleri sunulmuştur. Bulgular, türbülatör çapının ve konumunun basınç düşüşünü ve ısı transferini etkilediğini göstermiştir. Re=10000, d=6 mm ve t=7 mm parametreleri için ısı transferinin türbülatörsüz kanala göre 1.31 kat iyileştiği tespit edilmiştir. En yüksek termohidrolik performans Re=3000, d=6 mm ve t=11 mm durumunda THP=1.14 olarak bulunmuştur.

Keywords

• Asimetrik trapez kanal
• dairesel türbülatörler
• ısı transferi
• sayısal çalışma

Thermohydraulic Performance Analysis in an Asymmetric Trapezoidal Wavy Channel with Circular Turbulators

Abstract

This numerical study analyzes the heat transfer of turbulent flow in an asymmetric trapezoidal wavy channel with circular turbulators. The ANSYS Fluent program was used for the solutions. The standard k-ε turbulence model was used in the solutions. Circular turbulators were placed in the channel with 3 different diameters (d: 2 mm, 4 mm, 6 mm) and 3 different positions (t: 7 mm, 9 mm, 11 mm) and the effects of each on the flow and heat transfer were investigated. In the study, the Reynolds number was changed in the range of 3000≤Re≤10000, and the asymmetric wavy surfaces of the channel were kept constant at TS=340 K. Nusselt number (Nu), enhancement ratio (η), pressure drop (ΔP), and thermohydraulic performance (THP) values were calculated for different Reynolds numbers, different turbulator diameters and positions in the channel. In addition, the results obtained were compared with the asymmetric trapezoidal wavy channel without turbulators. As a result of the study, velocity and temperature images were presented in the channel for different parameters. The findings showed that the turbulator diameter and position affect the pressure drop and heat transfer. It was found that for the parameters Re=10000, d=6 mm, and t=7 mm, the heat transfer was improved by 1.31 times compared to the channel without a turbulator. The highest thermohydraulic performance was found to be THP=1.14 for Re=3000, d=6 mm, and t=11 mm.

Keywords

• Asymmetric trapezoidal channel
• circular turbulators
• heat transfer
• numerical study

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