Fe3O4/su ile Doldurulmus Kanatcikti Isi Kuyusunun Termodinamik Tersinmezlikleri Dikkate Alinarak Parametrik Analizleri

Öz

Elektronik bir cihazda aşırı yüklenen ısının tatmin edici bir şekilde dağıtılması verimli bir soğutma sistemine bağlıdır. Bu noktada mühendisler ve araştırmacılar, güvenilir çalışma davranışları ve dayanıklılıkları nedeniyle bir ısı kuyusu kullanmayı tercih ederler. Soğutucunun akışkan karakteristiğini ve ısıl performansını artırmak kolay ve basittir çünkü tasarımındaki herhangi bir küçük değişiklik, hidrotermal özelliklerinde bir artışın yolunu açar. Burada, ferronanoakışkan (Fe3O4/su; φ=%2) akan farklı kanatlı (dairesel, kare ve altıgen) ısı kuyularının termo-hidrolik performansını araştırmak için laminer rejim (1000≤Re≤2000) altında parametrik sayısal çalışmalar yapılmıştır. Genel olarak, temel duruma göre en yüksek başarı rakamı (FOM), nanoakışkansız ısı kuyusunda kare kanat tipi kullanılarak Re=1500'de gözlenirken, aynı geometrik konfigürasyonda en düşük toplam entropi üretimi ve en yüksek konvektifısı transferi performansı Re=2000 ve φ=%2’de sergilendi. Ayrıca, nanoakışkanla doldurulmuş ısı kuyusunda kare kanat tipi kullanımının Re=2000'de ortalama Nusselt sayısını (Nu) baz duruma göre %18,41 artırdığı ve aynı karşılaştırma için basınç düşüşünü %59 civarında artırdığı sonucuna varılmıştır. Son olarak, Re=2000 ve φ=%2'de kare kanatlı tip ısı kuyusu kullanılarak toplam entropi üretiminin baz duruma göre %7,71 oranında azaldığı görüldü.

Anahtar Kelimeler

• İğne Kanatçık
• Isı Kuyusu
• Taşınım Isı Transferi
• Fe3O4/su
• Entropi Üretimi
• HAD

Parametric Analyses of Finned Heatsink Filled with Fe3O4/water Regarding Thermodynamic Irreversibility

Abstract

Satisfactory distribution of the over loaded heat in an electronic device depends on an efficient cooling system. In this point, engineers and researchers prefer using a heatsink due to their reliable operation behavior and durability. To enhance fluid characteristic and thermal performance of the heatsink is easy and simple since any small change in its design paves the way for an increase in its hydrothermal characteristics. Herein, parametric numerical studies were performed under laminar regime (1000≤Re≤2000) to investigate thermo-hydraulic performance of the different finned (circular, square, and hexagonal) heatsinks flowing ferro-nanofluid (Fe3O4/water; φ=2%). Overall, the highest figure of merit (FOM) over base case were observed at Re=1500 by utilizing square fin type in the heatsink without nanofluid whilst the lowest total entropy generation and the highest convective heat transfer performance were exhibited at the same geometric configuration at Re=2000 and φ=2%. Besides, it was concluded that the use of square fin type in the heatsink filled with nanofluid augmented average Nusselt number (Nu) by 18.41% compared with base case at Re=2000 and increased pressure drop around 59% for the same comparison. Finally, it was seen that total entropy generation by using square fin type heatsink at Re=2000 and φ=2% was decreased by 7.71% over base case.

Keywords

• Pin Fin
• Heatsink
• Convective Heat Transfer
• Fe3O4/water
• Entropy Generation
• CFD

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