Enerji Depolamalı Bir Boruda Nanoakışkan Kullanımının Isıl Performansa Etkisinin Sayısal Olarak İncelenmesi

Abstract

Teknolojideki gelişmeler göz önüne alındığında, yüksek verimli elektronik cihazlardan beklenen verimlilik ve güvenirliğe ulaşmak için iyi bir termal performansa sahip yeni yaklaşımlar ve soğutuculara ihtiyaç duyulmaktadır. Bu çalışmada aynı hidrolik çapa, kanal uzunluğuna ve kesit geometrisine sahip alüminyum boru kullanılmıştır. Sistemin ısı transfer hızını arttırmak için; boru içerisinde su, %1 ve %2 derişimlerine sahip Al2O3/su nanoakışkanları, boru dış yüzeyinde ise 5mm kalınlığında RT25HC faz değiştiren maddesi (FDM) kullanılmıştır. Alüminyum boru içerisinden geçirilen akışkanlar dört farklı hız ve dört farklı Reynolds sayısında ANSYS 20.2 paket programı kullanılarak analiz edilmiştir. Elde edilen sonuçlara göre her bir akışkan için kütlesel erime oranı ve Nusselt sayısı hesaplanmıştır. Çalışmada elde edilen sonuçlar incelendiğinde en iyi Nusselt ve sıvı oranına Reynolds 1500 ve %2 Al2O3/su’da ulaşılmıştır. Tüm soğutucu akışkanlar için akışkan hızının artmasıyla soğutucu akışkanların kütlesel erime oranının ve Nusselt sayısının arttığı sonucuna ulaşılmıştır.

Keywords

• Nanoakışkan
• Faz Değiştiren Madde (FDM)
• Sayısal Analiz
• Isı Transferi

Numerical Investigation of the Effect of Using Nanofluids on Thermal Performance in an Energy Storage Pipe

Abstract

Considering the advances in technology, new approaches and heatsinks with good thermal performance are needed to achieve the efficiency and reliability expected from high-efficiency electronic devices. In this numerical study, an aluminum pipe with the same hydraulic diameter, channel length and cross-section geometry was used. To increase the heat transfer rate of the system; Al2O3/water nanofluids with water, 1% and 2% concentrations were used in the pipe, and a 5mm thick RT25HC phase change material (PCM) was used on the outer surface of the pipe. The fluids passed through the aluminum pipe were analyzed using the ANSYS 20.2 package program at four different speeds and four different Reynolds numbers. According to the results obtained, the mass melting ratio and Nusselt number were calculated for each fluid. When the results obtained from the study were examined, it was seen that the best Nusselt and liquid fraction was Reynolds 1500 and 2% Al2O3/water. For all refrigerants, it was concluded that the mass melting rate of the refrigerants and the Nusselt number increased with the increase of the fluid velocity.

Keywords

• Nanofluid
• Phase Change Materials (PCM)
• Numerical Analysis
• Heat Transfer

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