Experimental investigation of the effect of submerged multiple synthetic jets on heat transfer in cross-flow

Öz

In this study, the effect of multiple synthetic jet (zero mass flux) impingement on heat transfer, immersed in forced crossflow in a square-section channel with a heated bottom surface, was experimentally investigated. In the forced channel flow, effects on heat transfer six synthetic jets placed diagonally in the main flow have four different dimensionless amplitudes (Ao: 0.22, 0.44, 0.66 and 0.88) and six different dimensionless frequencies (Wo: 11, 16, 19, 22, 25, and 27) at different Reynolds numbers (6000 ≤ Re ≤ 40000) were examined experimentally. Nozzles made of copper pipes were immersed vertically into the main flow and the lower end of the jets was placed 2 cm from the target surface, and their effects on heat transfer in the turbulent regime of the main flow were analyzed. Temperature measurements were made using thermocouples placed at the channel entrances, exits, and on the target surface. Nusselt numbers (Nu) were calculated with the help of the obtained temperatures. In addition, the pressure loss between the channel inlet and outlet was determined and thermo-hydraulic performance (THP) values were calculated. The results showed that at Re = 6000, the target surface temperature decreased significantly with increasing amplitude and frequency, and the effects of amplitude and frequency on surface temperatures decreased at increasing Reynolds numbers. It was determined that for Re = 6000, Wo = 27, and Ao = 0.88, heat transfer was improved by 2.74 times compared to steady flow. It was observed that THP values increased with increasing amplitude and frequency for all Reynolds numbers tested. For a constant jet parameter (Ao = 0.88 and Wo = 27), the highest THP was determined as 2.6 at Re = 6000.

Anahtar Kelimeler

• Multiple Synthetic jet
• Forced convection
• Channel flow
• Heat transfer enhancement

Çapraz akışa daldırılmış çoklu sentetik jetlerin ısı transferine etkisinin deneysel incelenmesi

Öz

Bu çalışmada, alt yüzeyi ısıtılmış kare kesitli bir kanal içerisindeki zorlanmış çapraz akışa daldırılmış çoklu sentetik jet (sıfır kütle akılı) çarpmasının ısı transferine etkisi deneysel olarak araştırılmıştır. Cebri kanal akışında, ana akışa çapraz olarak yerleştirilen altı adet sentetik jetin farklı Reynolds sayılarında (6000 ≤ Re ≤ 40000) dört farklı boyutsuz genlik (Ao: 0.22, 0.44, 0.66 ve 0.88) ve altı farklı boyutsuz frekans (Wo: 11, 16, 19, 22, 25 ve 27) için ısı transferine etkisi deneysel olarak incelenmiştir. Bakır borulardan yapılmış nozullar, ana akış içerisine dikey olarak daldırılmış ve nozulların alt ucu hedef yüzeye 2 cm mesafede yerleştirilmiş olup, ana akışın türbülanslı rejiminde ısı transferine etkileri analiz edilmiştir. Kanal giriş ve çıkışlarına ve hedef yüzey üzerine yerleştirilmiş ısıl çiftler aracılığı ile sıcaklık ölçümleri yapılmıştır. Elde edilen sıcaklıklar yardımıyla Nusselt sayıları (Nu) hesaplanmıştır. Ayrıca kanal giriş ve çıkışı arasındaki basınç kaybı tespit edilerek termo-hidrolik performans (THP) değerleri hesaplanmıştır. Elde edilen sonuçlar, Re=6000’de, artan genlik ve frekansla hedef yüzey sıcaklığının kayda değer şekilde düştüğünü ve artan Reynolds sayılarında genlik ve frekansın yüzey sıcaklıkları üzerindeki etkilerinin azaldığını göstermiştir. Re=6000, Wo=27 ve Ao=0.88 için daimî akışa göre 2.74 kat ısı transferinin iyileştiği tespit edilmiştir. Çalışılan tüm Reynolds sayıları için artan genlik ve frekansla THP değerlerinin arttığı gözlenmiştir. Sabit bir jet parametresi için (Ao=0.88 ve Wo=27) en yüksek THP, Re=6000’de 2.6 olarak tespit edilmiştir.

Anahtar Kelimeler

• Çoklu sentetik jet
• Cebri taşınım
• Kanal akışı
• Isı transferi iyileştirme

Kaynakça

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