Değişen Genlik Oranına Sahip Dalgalı Bir Kanalda Akış ve Isı Transferi Özelliklerinin İncelenmesi

Abstract

Isı değiştiriciler, modern endüstriyel sistemlerde kritik öneme sahiptir ve ısı transfer verimliliğinin artırılması enerji tasarrufu, düşük maliyet ve sürdürülebilirlik için gereklidir. Dalgalı duvar kanalları, akış ve ısı transferi üzerindeki etkileri nedeniyle dikkat çekmektedir. Bu çalışmada, dalgalı duvarlı bir kanalda genlik oranı ve Reynolds sayısının sürtünme katsayısı, akım çizgileri, sıcaklık konturları ve Nusselt sayısı etkileri incelenmiştir. Sonuçlar, artan genlik oranının resirkülasyon ve termal karışımı yoğunlaştırarak ısı transferini artırdığını ve bunun daha yüksek Nusselt sayısına yol açtığını göstermektedir. Her dalgalı geçitte ortaya çıkan maksimum Nusselt sayısı, en büyük genlik oranı (α = 0.35) ve Reynolds sayısı Re = 1×10³ için ortalama olarak 2,6 kat artış göstermiştir. Ayrıca, genlik oranının etkisi, laminer akıştan türbülanslı akışa geçişin kanalın girişine doğru kaydığı daha yüksek Reynolds sayılarında daha belirgin hale gelmektedir. Ancak, bu ısı transferi artışı sürtünme katsayısında bir yükselişle birlikte gerçekleşmekte olup, dalgalı kanalların pratik uygulamalarının belirli koşullar için değerlendirilmesi ve gerekçelendirilmesi gerekmektedir.

Keywords

• Isı transferinin artırılması
• Dalgalı duvarlı kanal
• Termal gelişen akış
• Nusselt sayısı
• Pasif akış kontrolü

Investigation of Flow and Heat Transfer Characteristics in a Wavy Channel with Varying Amplitude Ratio

Abstract

Heat exchangers play a vital role in modern industrial systems, where improving heat transfer efficiency is essential for reducing energy consumption, minimizing costs, and supporting sustainable operations. Wavy-wall channels are of particular interest because their geometry can influence flow and heat transfer characteristics. In this study, the effects of the amplitude ratio and the Reynolds number in a wavy-wall channel are investigated with respect to the skin friction factor, streamline patterns, temperature contours, and the Nusselt number. The results indicate that increasing the amplitude ratio (α) enhances heat transfer by intensifying the recirculation zones and thermal mixing, leading to higher Nusselt number. The peak value of the Nusselt number occurring in each wavy passage exhibited an average increase by a factor of 2.6 for the largest amplitude ratio (α = 0.35) at Reynolds number Re = 1×10³. Furthermore, the influence of the amplitude ratio (α) becomes more pronounced at higher Reynolds numbers, as the laminar-to-turbulent transition shifts further upstream. However, this heat transfer enhancement is accompanied by an increase in the skin friction factor (C_f), highlighting the need to evaluate and justify the practical implementation of wavy channels for specific applications.

Keywords

• Heat transfer enhancement
• Wavy-wall Channel
• Thermally developing flow
• Nusselt Number
• Passive flow control

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