Nanoakışkanlar ve Kanatlı İç Boru Kullanılarak Zıt Akışlı Çift Borulu Isı Değiştiricide Isı Transferinin Artırılmasına İlişkin Sayısal Araştırma

Öz

Bu çalışma, kanatlı iç boru ile donatılmış ters akışlı çift borulu bir ısı eşanjöründe Fe₂O₃–su ve SiO₂–su nanoakışkanlarının termal performansını sayısal olarak incelemektedir. Simülasyonlar, %5 ve %10 nanopartikül hacim konsantrasyonları ile 10.000 ve 30.000 Reynold sayıları için gerçekleştirilmiştir. Sayısal çerçeve, tek fazlı homojen nanoakışkan modeline dayandırılmış ve literatürdeki deneysel verilerle doğrulanmıştır. Bulgular, nanoakışkan uygulamasının saf suya kıyasla önemli iyileştirmeler sağladığını göstermektedir. Özellikle, %10 hacimce Fe₂O₃–su nanoakışkanı ısı transferinde %40'a varan bir artış sağlarken, SiO₂–su nanoakışkanı aynı koşullar altında nispeten daha düşük kazançlar sergilemiştir. Yüzey alanının 1,8 kat artmasının ötesinde, kanatlı iç boru, termal sınır tabakasını bozan ikincil akışlar ve girdaplar oluşturarak, özellikle daha yüksek Reynold sayılarında konvektif ısı transferini önemli ölçüde yoğunlaştırmıştır. Bilgimiz dahilinde, bu çalışma, kanatlı iç tüp geometrisi ve nanoakışkan uygulamasının sinerjik etkilerini kapsamlı bir şekilde değerlendiren ilk çalışmadır ve sürdürülebilir enerji sistemlerinde kompakt ve enerji verimli ısı eşanjörlerinin tasarımı için değerli bilgiler sunmaktadır.

Anahtar Kelimeler

• Çift Borulu Isı Değiştiricisi
• Nanoakışkan
• Nümerik Analiz
• HAD
• Zıt Akış

Numerical Investigation of Heat Transfer Enhancement in a Counter-Flow Double-Pipe Heat Exchanger Using Nanofluids and a Finned Inner Tube

Öz

This study numerically investigates the thermal performance of Fe₂O₃–water and SiO₂–water nanofluids in a counter-flow double-pipe heat exchanger equipped with a finned inner tube. Simulations were performed for Reynolds numbers of 10,000 and 30,000 with nanoparticle volume concentrations of 5% and 10%. The numerical framework was based on the single-phase homogeneous nanofluid model and validated against experimental data from the literature. The findings demonstrate that nanofluid application provides substantial improvements compared to pure water. In particular, the 10 vol.% Fe₂O₃–water nanofluid achieved up to 40% enhancement in heat transfer, while SiO₂–water nanofluid exhibited relatively lower gains under identical conditions. Beyond the surface area increase by a factor of 1.8, the finned inner tube induced secondary flows and vortices that disrupted the thermal boundary layer, thereby significantly intensifying convective heat transfer, especially at higher Reynolds numbers. To the best of our knowledge, this is the first work to comprehensively assess the synergistic effects of finned inner tube geometry and nanofluid application, offering valuable insights for the design of compact and energy-efficient heat exchangers in sustainable energy systems.

Anahtar Kelimeler

• Double Tube Heat Exchanger
• Nanofluid
• Numerical Analysis
• Counter-Flow
• CFD

Kaynakça

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