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Journals / Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi / 2000 / Cilt: 15 Sayı: 1

NUMERICAL INVESTIGATION OF FLUID FLOW IN A DUCT WITH RECTANGULAR CROSS SECTION UNDER LAMINAR MIXED CONVECTION CONDITIONS

Dikdörtgen Kesitli Bir Kanalda Laminer Karışık Konveksiyon Şartlarındaki Akışın Sayısal Olarak İncelenmesi

Abuzer Özsunar
Şenol Başkaya
Mecit Sivrioğlu
Pages
71–86
Publication Date
2013-03-01
DOI
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

Local Nusselt number results were compared with experimental results, and it was found that they are in good agreement.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:In this study heat transfer, velocity and temperature distributions in a horizontal duct with rectangular cross section and an aspect ratio of 10 have been investigated under laminar mixed convection conditions using amethod of Computational Fluid Dynamics (CFD).
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Key Findings & Data:The lower surface of the duct is subjected to a uniform heat flux, sidewalls are insulated, and the upper surface is exposed to the surrounding fluid. making use of temperatures obtained from the CFD analysis, local Nusselt numbers were calculated.
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Conclusion & Impact:Local Nusselt number results were compared with experimental results, and it was found that they are in good agreement.
🔬Design:Araştırma Makalesi
📍Scope:Comprehensive Sample
⚙️Variables:Karışık konveksiyon · kanal akışı · laminer tam gelişmiş akış

Abstract

In this study heat transfer, velocity and temperature distributions in a horizontal duct with rectangular cross section and an aspect ratio of 10 have been investigated under laminar mixed convection conditions using amethod of Computational Fluid Dynamics (CFD). The lower surface of the duct is subjected to a uniform heat flux, sidewalls are insulated, and the upper surface is exposed to the surrounding fluid. making use of temperatures obtained from the CFD analysis, local Nusselt numbers were calculated. Local Nusselt number results were compared with experimental results, and it was found that they are in good agreement. Results related to the buoyancy affected secondary flow and the onset of instability in duct flows were examined in detail. In addition, temperature contours as well as velocity vector distributions inside the duct are also presented in detail. Governing equations were solved numerically and obtained solutions are compared with previously made experimental measurements. From an energy balance and by

Özet

Bu çalışmada yatay dikdörtgen kesitli, en/yükseklik oranı (EYO) 10 olan bir kanalda laminer karışık konveksiyon şartlarında ısı transferi ile sıcaklık ve hız dağılımları Sayısal Akışkanlar Dinamiği (SAD) yöntemi kullanılarak incelenmiştir. Kanal alt yüzeyi üniform ısı akısına maruz, yan yüzeyler yalıtımlı, kanal üst yüzeyi ise dış ortamdaki akışkana maruz bırakılmıştır. Problemi tanımlayan temel korunum denklemleri sayısal olarak çözülmüş ve elde edilen sonuçlar, daha önce yapılmış deneysel sonuçlarla karşılaştırılmıştır. SAD analizi ile elde edilen sıcaklıkların kullanılmasıyla, yerel Nusselt sayıları hesaplanmıştır. Yerel Nusselt sayısı sonuçları, deneysel ölçümlerle karşılaştırılmış ve uyum içinde olduğu bulunmuştur. Kanal içindeki akışlarda kaldırma kuvveti etkili ikincil akış ve kararsızlığın başlangıcı ile ilgili sonuçlar ayrıntılı bir şekilde irdelenmiştir. Buna ilave olarak, kanal içindeki sıcaklık ve kontur grafikleri ayrıntılı olarak sunulmuştur.

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Cite This Article

Özsunar, A., Başkaya, Ş., Sivrioğlu, M. (2013). NUMERICAL INVESTIGATION OF FLUID FLOW IN A DUCT WITH RECTANGULAR CROSS SECTION UNDER LAMINAR MIXED CONVECTION CONDITIONS. Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi, Cilt: 15 Sayı: 1, 71–86. https://ajindex.com/articles/1079235

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