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

Öz

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.

Anahtar Kelimeler

• 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

Öz

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.

Anahtar Kelimeler

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

Kaynakça

1. [1] Kurtulmuş N, Zontul H, Sahin B (2020) Heat transfer and flow characteristics in a sinusoidally curved converging-diverging channel. International Journal of Thermal Sciences 148:106163.
2. [2] Aslan E, Taymaz I, Islamoglu Y (2016) Finite volume simulation for convective heat transfer in wavy channels. Heat Mass Transfer 52:483–497.
3. [3] Özbolat V, Şahin B (2022) Flow Characteristics and Heat Transfer Enhancement of Sinusoidal Corrugated Channels with Different Configurations. Çukurova Üniversitesi Mühendislik Fakültesi Dergisi 37:93–107.
4. [4] Alsabery AI, Sheremet MA, Chamkha AJ, Hashim I (2022) Forced convection of turbulent flow into the wavy parallel channel. J Therm Anal Calorim 147:11183–11194.
5. [5] Al-Zuhairy RCh, Kareem ZS, Khudhur DS, Balla HH (2024) Corrugation characteristics effect of channel on heat transfer and pressure Drop: Experimental study. International Journal of Heat and Fluid Flow 107:109333.
6. [6] Corbett TM, Thole KA, Bollapragada S (2022) Amplitude and Wavelength Effects for Wavy Channels. Journal of Turbomachinery 145:.
7. [7] Raheem A, Khalid A, Siddique W, et al (2024) CFD analysis of novel two-pass, sinusoidal corrugated, trapezoidal channel for solar air heater. International Journal of Ambient Energy 45:1–18.
8. [8] Jan M, Sofi AY, Qayoum A (2025) Design optimization and thermohydraulic performance of mini-channel heat sinks. J Therm Anal Calorim 150:10441–10457.

9. [9] Chang SW, Lees AW, Chou TC (2009) Heat transfer and pressure drop in furrowed channels with transverse and skewed sinusoidal wavy walls. International Journal of Heat and Mass Transfer 52:4592–4603.
10. [10] Guzmán AM, Cárdenas MJ, Urzúa FA, Araya PE (2009) Heat transfer enhancement by flow bifurcations in asymmetric wavy wall channels. International Journal of Heat and Mass Transfer 52:3778–3789.
11. [11] Sarkar M, Paramane SB, Sharma A (2017) Periodically Fully Developed Heat and Fluid Flow Characteristics in a Furrowed Wavy Channel. Heat Transfer Engineering 38:278–288.
12. [12] Pang F, Wang L (2025) Flow instability and its effect on heat transfer in a sinusoidal wavy duct with rectangular cross section. Energy 335:137939.
13. [13] Langtry RB, Menter FR (2009) Correlation-Based Transition Modeling for Unstructured Parallelized Computational Fluid Dynamics Codes. AIAA Journal 47:2894–2906.
14. [14] Salari M, Rava A (2017) Numerical investigation of hydrodynamic flow over an AUV moving in the water-surface vicinity considering the laminar-turbulent transition. Journal of Marine Science and Application 16:298–304.
15. [15] Hærvig J, Sørensen K, Condra TJ (2017) On the fully-developed heat transfer enhancing flow field in sinusoidally, spirally corrugated tubes using computational fluid dynamics. International Journal of Heat and Mass Transfer 106:1051–1062.
16. [16] Guzmán J, Lozano-Parada JH, Zimmerman WBJ, Laín S (2021) Numerical simulation of the transient behavior of the turbulent flow in a microfluidic oscillator. J Braz Soc Mech Sci Eng 43:29.
17. [17] ANSYS Inc. (2020) ANSYS Fluent Theory Guide
18. [18] Shah R (1975) Thermal entry length solutions for the circular tube and parallel plates. In: Proceedings of 3rd national heat and mass transfer conference. Indian Institute of Technology Bombay Delhi, pp 11–75