Flow Boiling Characteristics of Nanofluids in Microchannels

Year 2017, Volume: 7 Issue: 1, 237 - 249, 01.07.2017

Eyüphan Manay

Abstract

Due to the ever increasing heat flux values, traditional heat transfer enhancement methods fail to
satisfy on cooling of micro systems. Flow boiling heat transfer has a great potential for the applications requiring
high heat removal rates because high heat transfer coeffcients are achieved in addition to surface temperature to
be nearly constant. On the other hand, use of nanofluids instead of traditional fluids is thought to be an important
alternative for high thermal performance. Although there are numerous study on the single phase heat transfer of
nanofluids, a few number of study concerning with the flow boiling heat transfer of nanofluids in microchannels
exists. In the literature, there are some conflicts on whether the use of nanofluids in flow boiling is appropriate or
not. Thus, more detailed studies on the usability of nanofluids in boiling flow conditions are required. In this study,
experimental studies conducted by with nanofluids were reviewed, and the advantages and disadvantages of the
using nanofluids in boiling flows in microchannels were determined.

Keywords

Critical heat flux, flow boiling, microchannel, nanofluid

Mikrokanallarda Nanoakışkanların Kaynamalı Akış Karakteristikleri

Abstract

Mikrocihazlarda giderek artan ısı akısı değerleri nedeniyle geleneksel ısı transfer arttırım yöntemleri
mikrosistemlerin soğutulmasında yetersiz kalmaktadır. Kaynama ile ısı transferi yüksek ısı transfer katsayılarının
elde edilmesi yanında yüzey sıcaklığının neredeyse sabit olması nedeniyle yüksek ısı atımını gerektiren mikrosistem
uygulamaları için önemli bir potansiyele sahiptir. Diğer yandan geleneksel akışkanlar yerine nanoakışkanların
kullanımı yüksek ısıl performans için önemli bir alternatif olarak düşünülmektedir. Nanoakışkanların tek fazlı
ısı transferiyle ilgili birçok çalışma olmasına rağmen mikrokanallarda kaynamalı akış durumunda nanoakışkan
kullanımıyla ilgili sınırlı sayıda çalışma mevcuttur. Literatürde nanoakışkanların kaynamalı akışta kullanımının bazı
çalışmalara göre uygun olup olmadığı yönünde belirsizlikler vardır. Bu nedenle nanoakışkanların kaynamalı akış
şartlarında kullanılabilirliği ile ilgili daha kapsamlı çalışmalara ihtiyaç vardır. Bu çalışmada, farklı nanoakışkanlar
ile yapılan deneysel çalışmalar derlenmiş ve nanoakışkanların mikrokanallarda kaynamalı akışta kullanımının
avantaj ve dezavantajları belirlenmeye çalışılmıştır.

Keywords

Kaynamalı akış, kritik ısı akısı, mikrokanal, nanoakışkan

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