Analysis of Cooling Performance Using Multiple Impinging Jets on Inclined Surfaces

Öz

Nowadays, the importance of heat transfer is increasingly growing in both daily life and industrial processes. With the technological advancements, cooling high heat flux generating microprocessors, electromechanical systems, and circuit components has become of great importance. It is stated that the application of impinging jet cooling is a fast, economical, and efficient method. In this study, the heat transfer performance of finned and non-finned heat sinks positioned at a specific incline under the influence of multiple jet impacts was examined. An experimental investigation was conducted on heat sinks to examine the impacts of varying nozzle diameters, H/D distances, and velocity values under a constant heat flux of 400 W and a heat receiver angle of 10°. The analyzes were performed using nine nozzles arranged in a 3x3 grid, three different nozzle diameters (d=25, 32, 40 mm), three different dimensionless nozzle-heat sink distances relative to the nozzle diameter (H/D=6, 7, 8), and five different velocity values (V=5, 6, 7, 8, 9 m/s). In conclusion the acquired data were illustrated through Nusselt-Reynolds graphs, and the influence of the parameters on heat transmission was examined. For finned and unfinned heat exchangers, the analysis determined that the Nusselt number rises with an increase in pipe diameter and Reynolds number, whereas it diminishes as the distance between the nozzle and the heat exchanger expands. At constant heat flux and heat sink angle values, the highest Nusselt number was calculated in the rectangular finned and unfinned inclined heat sink, at a nozzle diameter of D=40mm, at a dimensionless distance of H/D=6, and at a flow rate of 9m/s. In contrast, the lowest Nusselt number was calculated for the inclined heat sink without fins and rectangular finned inclined heat sink, with a nozzle diameter of D=25mm, at a dimensionless distance of H/D=8, and an airflow velocity of 5m/s.

Anahtar Kelimeler

• Forced convection
• Heat transfer enhancement
• Multi-impinging jet

Etik Beyan

"Ethical committee approval is not required for the prepared article."

Eğimli Yüzeylerde Çoklu Çarpan Jetle Soğutma Performansının Analizi

Öz

Günümüzde günlük yaşamda ve endüstriyel proseslerde transfer edilen ısının önemi giderek artmaktadır. Yaşanan teknolojik gelişmeler nedeniyle, yüksek ısı akısı üreten mikro işlemciler, elektromekanik sistemler ve devre elemanları soğutulması çok önemlidir. Çarpan jetle soğutma uygulamalarının, hızlı, ekonomik ve verimli bir yöntem olduğu belirtilmektedir. Bu çalışmada, belirli bir eğimde konumlandırılan kanatçıklı ve kanatçıksız ısı alıcıların, çoklu çarpan jet etkisinde ısı transfer performansları incelenmiştir. Isı alıcılarda, 400 W sabit ısı akısı ve 10°’lik ısı alıcı açısı etkisinde farklı lüle çapı, H/D mesafesi ve hız değerleri etkisinin deneysel analizi gerçekleştirilmiştir. Analizler her biri 3x3 dizilimli dokuz nozullu üç farklı lüle çapında, üç farklı lüle-ısı alıcı arası boyutsuz mesafede (H/D=6, 7, 8) ve beş farklı hız büyüklüğü için gerçekleştirilmiştir. Sonuç olarak, elde edilen veriler Nusselt-Reynolds grafikleri haline getirilmiş ve parametrelerin ısı transferi üzerindeki etkileri değerlendirilmiştir. Kanatçıklı ve kanatçıksız ısı alıcılar için, Nusselt sayısının artan boru çapı ve Reynolds sayısıyla arttığı buna karşın boyutsuz mesafe arttıkça Nusselt sayısının azaldığı sonucuna ulaşılmıştır. Sabit ısı akısı ve ısı alıcı açısı değerlerinde, en yüksek Nusselt sayısı, dikdörtgen kanatçıklı ve kanatçıksız eğimli ısı alıcıda, D=40mm olan lüle çapında, H/D=6 boyutsuz mesafesinde ve 9m/s akış hızında hesaplanmıştır. Buna karşın en düşük Nusselt sayısı, dikdörtgen kanatçıklı ve kanatçıksız eğimli ısı alıcıda, D=25mm olan lüle çapında, H/D=8 boyutsuz mesafesinde ve 5m/s akış hızında hesaplanmıştır.

Anahtar Kelimeler

• Çoklu çarpan jet
• Isı transferinin iyileştirilmesi
• Zorlanmış taşınım

Etik Beyan

“Hazırlanan makalede etik kurul izni alınmasına gerek yoktur”

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