Cooling of Surfaces In Combined Jet Flow Channels with Fin and Different Height Using Diamond-Water Nanofluid

Öz

The combined jet effect, which consists of a impinging jet and cross flow, has an effect that increases the cooling performance of electronic elements. In this study, heat transfer and performance analysis from cube and trapezoidal surfaces by using water and 2% volumetric concentration Diamond-Water nanofluid in channels without fin and 30o fin angled, N=2D fin distance and H=3D and 4D channel heights with combined jet flow were numerically researched. Numerical analysis was carried out steady and in three dimensions with the k-ε turbulence model Ansys-Fluent program. Considering the studies in the literature, three models were placed in the channels in accordance with the channel dimensions. The Re number range of the fluids in the channel is 5000-9000. The results were matched with the Nu results of the experimental study in the literature and they were determined to be compatible. The results of the study were examined comparatively for water and nanofluid as mean Nu number and surface temperature changes for each model in channels at different channel heights in finless and finned cases. In addition, velocity and temperature contour distributions of the combined jet nanofluid flow were presented. However, performance evaluation numbers (PEC) at different Reynolds numbers and average Nu number (Num) and surface temperature values (Tm) were evaluated for Re=7000 for all three model surfaces in the channels. The use of Diamond-Water nanofluid in the H=3D and finned channel resulted in 24.14% and 18.91% higher Num values on cube and trapezoidal surfaces compared to the finless and water-fluid channel, respectively.

Anahtar Kelimeler

• Diamond-Water nanofluid
• Combined jet with impinging jet-cross flow
• Heat transfer

Proje Numarası

TENO-2021-031

Elmas-Su Nanoakışkanı Kullanılan Kanatçıklı ve Farklı Yükseklikli Birleşik Jet Akışlı Kanallarda Yüzeylerin Soğutulması

Öz

Çarpan jet-çapraz akıştan oluşan birleşik jet etkisi elektronik elemanların soğutma performansını artırıcı bir etkiye sahiptir. Bu çalışmada, birleşik jet akışıyla kanatçıksız ve 30o açıya sahip kanatçıklı, N=2D kanatçık mesafeli ve H=3D ve 4D yükseklikli kanallarda su ve %2 hacimsel konsantrasyonlu Elmas-Su nanoakışkanı kullanılmasıyla küp ve yamuk modelli yüzeylerden olan ısı transferi ve performans analizi sayısal olarak incelenmiştir. Sayısal araştırma, sürekli ve üç boyutlu, k-ε türbülans modelli Ansys-Fluent programıyla gerçekleştirilmiştir. Literatürdeki çalışmalar gözetilerek kanal boyutlarına uygun olarak kanallara üçer adet model yerleştirilmiştir. Kanaldaki akışkanların Re sayısı aralığı 5000-9000’ dir. Sonuçlar, literatürdeki deneysel çalışmanın Nu sonuçlarıyla kıyaslanmış ve uyumlu oldukları belirlenmiştir. Çalışmanın sonuçları, kanallardaki her bir model için ortalama Nu sayısı ve yüzey sıcaklığının değişimleri olarak su ve nanoakışkan için kanatçıksız ve kanatçıklı durumlarda farklı kanal yüksekliklerinde karşılaştırmalı olarak incelenmiştir. Ayrıca, birleşik jet nanoakışkan akışının hız ve sıcaklık konturu dağılımları sunulmuştur. Bununla birlikte, kanallardaki her üç model yüzeyinin tümü için farklı Reynolds sayılarında performans değerlendirme sayıları (PEC) ve Re=7000 için ortalama Nu sayısı (Num) ve yüzey sıcaklık değerleri (Tm) değerlendirilmiştir. H=3D ve kanatçıklı kanalda Elmas-Su nanoakışkanının kullanılması kanatçıksız ve su akışkanı kullanılan kanala göre küp ve yamuk modelli yüzeylerde Num değerlerinin sırasıyla %24,14 ve %18,91 daha fazla olmasını sağlamıştır.

Anahtar Kelimeler

• Elmas-Su nanoakışkanı
• Çarpan jet-çapraz akışlı birleşik jet
• Isı transferi

Destekleyen Kurum

Sivas Cumhuriyet Üniversitesi Bilimsel Araştırma Projeleri (CÜBAP) birimi

Proje Numarası

TENO-2021-031

Teşekkür

Bu çalışma, Sivas Cumhuriyet Üniversitesi Bilimsel Araştırma Projeleri (CÜBAP) birimi tarafından TEKNO-2021-031 proje numarası ile desteklenmiştir.

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