Abstract

Isı transferi birçok endüstriyel ve tüketici sisteminde önemli bir role sahiptir. Isı borusu, ısı transferi için kullanılan yüksek ısı iletkenliğine sahip bir cihazdır. Isı borusu üç bölümden oluşur; ısıyı çalışma sıvısına ileten buharlaştırıcı bölümü: ısı transferi için kullanılan adyabatik bölüm ve çalışma sıvısını soğutan yoğunlaştırıcı bölüm. Isı borusunun temel çalışma prensibi, içinde bulunan çalışma sıvısının fazını değiştirmektir. Isı borusu, evaporatörden ısıyı emer, adyabatik bölümden yoğunlaştırıcıya dönüşür ve sıcaklığını ortama iletir, yani ısıyı bir bölgeden diğerine buharlaşma ve yoğuşma fazı değişikliği kullanarak aktarır. Isı borusunda kullanılan geleneksel çalışma akışkanlarının zayıf ısıl iletkenliği, ısı transferinin etkinliğini ve uygulamasını sınırlar. Bu nedenle, geleneksel çalışma sıvısını yüksek ısı transfer performansına sahip bir çalışma sıvısı ile değiştirme fikri oluşmuştur. Bilim adamları ve mühendisler, nano boyutlu parçacıkları sıvılara dağıtarak bu temel sorunun üstesinden gelmek için büyük çaba sarf ettiler. Nanosıvılar, nanopartiküllerin geleneksel çalışma sıvısı ile karıştırılmasıyla oluşturulan kararlı katı-sıvı süspansiyonlardır. Bu çalışmada, ısı borularında kullanılan nanoakışkanlar üzerinde deneysel ve sayısal araştırmalar incelenmiştir. Isı borusunun ısıl performansı ve ısıl direnci birçok deneysel koşula bağlıdır. Bu koşullar, ısı borusu tipleri, nanoakışkan özellikleri, ısı borularının tasarımı ve çalışma koşulları gibi farklı parametreleri içerir.

Keywords

• Isı borusu
• ısı transferi
• termal performans
• nanoakışkan

Investigation of The Effect of Nanofluids on Heat Transfer Performance of Heat Pipes

Abstract

Heat transfer has an important role in many industrial and consumer systems. The heat pipe is a device with high thermal conductivity used for heat transfer. Heat pipe consists of three parts; the evaporator section, which transmits heat to the working fluid: the adiabatic section used for heat transport and the concentrator section that cools the working fluid. The basic working principle of the heat pipe is to change the phase of the working fluid contained in it. The heat pipe absorbs heat from the evaporator, transforms from adiabatic section to concentrator and transmits its temperature to the environment, i.e. transfer heat from one region to another using evaporation and condensation phase change. The weak thermal conductivity of the traditional working fluids used in the heat pipe limits the effectiveness and application of heat transfer. Therefore, the idea of replacing the traditional working fluid with a working fluid with high heat transfer performance has been formed. Scientists and engineers have made great efforts to overcome this fundamental problem by distributing nano-sized particles into liquids. Nanofluids are stable solid-liquid suspension created by mixing nanoparticles with traditional working fluid. In this study, experimental and numerical research on nanofluids used in heat pipes are examined. The thermal performance and thermal resistance of the heat pipe depend on many experimental conditions. These conditions contain different parameters such as heat pipe types, nanofluid properties, design of heat pipes and working conditions.

Keywords

• Heat pipe
• heat transfer
• thermal performance
• nanofluid

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