Dikdörtgen Kanatlı Yüzeyler Üzerindeki Isı Transfer Karakteristiklerinin Taguchi Yöntemiyle Deneysel Olarak İncelenmesi

Year 2024, Volume: 7 Issue: 5, 2084 - 2093, 10.12.2024

Onur Yemenici

Abstract

Bu çalışmada ısıtılmış dikdörtgen kanatlı yüzeyler üzerinden akışta akış hızı, kanat yüksekliği ve kanat sayısının ısı transferi üzerindeki etkileri Taguchi yöntemiyle deneysel olarak incelenmiştir. Deneyler 12, 18 ve 24 mm kanat yüksekliğinde ardışık 7, 8 ve 9 adet kanada sahip yüzeyler üzerinden 3, 10 ve 15 m/s akış hızları için düşük hızlı bir rüzgâr tünelinde yapılmıştır. Serbest akış ve duvar sıcaklıkları termal çiftler ile ölçülmüş ve performans parametresi olarak Stanton sayısı dikkate alınmıştır. Deneysel plan olarak L9 ortogonal dizisi seçilmiş ve sonuçlar sinyal-gürültü (S/N) oranı ve ANOVA yöntemi kullanılarak en uygun koşullar açısından analiz edilmiştir. Kanatlı yüzeyler üzerinde akışta ısı transferi kanat yüksekliği, kanat sayıları ve akış hızıyla artmıştır. Isı transferini arttırmak için en etkili parametre sırasıyla akış hızı ve kanat yüksekliği iken, kanat sayısı en az etkili parametre olarak belirlenmiştir. En iyi sonuç 9 adet 24 mm kanat yüksekliğine sahip yüzey üzerinde 15 m/s akış hızında elde edilmiştir.

Keywords

Dikdörtgen kanat, Taguchi yöntemi, Stanton sayısı, Isı transferi, Rüzgar tüneli

Experimental Investigation of Heat Transfer Characteristics over Rectangular Fin Surfaces by Taguchi Method

Abstract

In this study, the effects of flow velocity, fin height, and the number of fins on heat transfer over heated rectangular fin surfaces were experimentally investigated using the Taguchi method. Experiments were conducted in a low-speed wind tunnel with surfaces having consecutive 7, 8 and 9 fins with heights of 12, 18 and 24 mm, and for flow velocities of 3, 10, and 15 m/s. Free stream and wall temperatures were measured with thermocouples, and the Stanton number was considered as the performance parameter. An L8 orthogonal array was chosen as the experimental design, and the results were analyzed in terms of signal-to-noise (S/N) ratio and the analysis of variance (ANOVA) method to determine the optimal conditions. Heat transfer over fin surfaces increased with fin height, fin numbers, and flow velocity. While the most effective parameters in increasing heat transfer were flow velocity and fin height, respectively, the least effective parameter was determined as the number of fins. The optimal result was obtained with 9 fins of 24 mm height on the surface at a flow velocity of 15 m/s.

Keywords

Rectangular fin, Taguchi method, Stanton number, Heat transfer, Wind tunnel

References

• Arslanoglu N., Yigit A. Experimental investigation of radiation effect on human thermal comfort by Taguchi method. Applied Thermal Engineering 2016; 92: 18–23.
• Bilen K., Yapici S. Heat transfer from a surface fitted with rectangular blocks at different orientation angle. Heat and Mass Transfer 2001; 38: 649–655.
• Chomdee S., Kiatsiriroat T. Air-cooling enhancement with delta winglet vortex generators in entrance region of ın-line array electronic modules. Heat Transfer Engineering 2007; 28: 372–379.
• Comakli K., Simsek F., Comakli O., Sahin B. Determination of optimum working conditions R22 and R404A refrigerant mixtures in heat-pumps using Taguchi method. Applied Energy 2009; 86: 2451–2458.
• Herman C., Kang E. Comparative evaluation of three heat transfer enhancement strategies in a grooved channel. Heat and Mass Transfer 2001; 37: 563–575.
• Kim SH., Anand NK. Turbulent heat transfer between a series of parallel plates with surface-mounted discrete heat sources. ASME Journal of Heat Transfer 1994; 116: 577–587.
• Lock RH., Lock PF., Morgan KL., Lock EF., Lock DF. Statistics: Unlocking the power of data. 2nd Ed. John Wiley & Sons Inc.: 2017.
• Holman JP. Experimental methods for engineers. 5th ed. NY: McGraw Hill; 1989.
• Naik S., Probert SD., Bryden IG. Heat transfer characteristics of shrouded longitudinal ribs in turbulent forced convection. International Journal of Heat and Fluid Flow 1999; 20: 374–384.
• Ryu DN., Choi DH., Patel VC. Analysis of turbulent flow in channels roughened by two-dimensional ribs and three-dimensional blocks, Part II: Heat transfer. International Journal of Heat and Fluid Flow 2007; 28: 1112–1124.
• Ryu DN., Choi DH., Patel VC. Analysis of turbulent flow in channels roughened by two-dimensional ribs and three-dimensional blocks, Part I: Resistance. International Journal of Heat and Fluid Flow 2007; 28: 1098–1111.
• Turkan B. Optimization analysis of the inkjet using the Taguchi method. Pamukkale Universitesi Mühendislik Bilimleri Dergisi 2023; 29(3): 281-288.
• Tsay YL., Cheng, JC. Analysis of convective heat transfer characteristics for a channel containing short multi-boards mounted with heat generating blocks. International Journal of Heat and Mass Transfer 2008; 51: 145–154.
• Umur H., Yemenici O., Umur Y., Sakin A. Flow and heat transfer characteristics over rectangular blocked surfaces. Experimental Heat Transfer 2017; 30(3): 192-204.
• Witcher K., McAndrew I., Vishnevskaya E. Aerodynamic analysis of low speed wing design using Taguchi L9 orthogonal array. Asia Conference on Mechanical and Aerospace Engineering, 2017.
• Wu HW., Perng SW. Effect of oblique plate on the heat transfer enhancement of mixed convection over heated blocks in a horizontal channel. International Journal of Heat and Mass Transfer 1999; 42: 1217–1235.
• Yemenici O., Firatoğlu ZA., Umur H. An experimental investigation of flow and heat transfer characteristics over blocked surfaces in laminar and turbulent flows. International Journal of Heat and Mass Transfer 2012; 55: 3641-3649.