Experimental study of the characteristics and mechanism of pool boiling CHF enhancement using nanofluids

Kim, Hyungdae; Kim, Moo-Hwan

doi:10.1007/s00231-007-0318-8

Cited by 134 publications

(56 citation statements)

References 8 publications

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“…Furthermore, in the previous experimental researches, it has been shown that the suspended nanoparticles in the base liquid decrease the radius of the bubble and, therefore, more active sites on the heating surface occur. Consequently, the boiling heat transfer coefficient increases, which is consistent with the present results (Raveshi et al, 2013;Kim and Kim, 2009;Yang and Liu, 2011). …”

Section: Bubble Release Frequencysupporting

confidence: 93%

Numerical investigation of pool nucleate boiling in nanofluid with lattice Boltzmann method

Rostamzadeh

Jafarpur

Rad

2016

jtam

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Due to significant improvement of thermal performance and other properties of nanofluids, this group of liquids is in high demand. According to the literature, the effect of nanoparticles on boiling heat transfer enhancement or degradation is not the same among different investigations. In the present article, the pseudo-potential multiphase lattice Boltzmann method is used to simulate nucleate pool boiling with two different fluids: a pure liquid and a nanofluid. The current results indicate that the contact angle is the same for both the fluid and nanofluid when the vapor bubble detachment occurs. Also, bubble departure diameter is greater in the base liquid while bubble release frequency is higher in the nanofluid. In brief, the present results demonstrate that using a nanofluid instead of its base fluid will increase the boiling heat transfer coefficient.

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Section: Bubble Release Frequencysupporting

confidence: 93%

Numerical investigation of pool nucleate boiling in nanofluid with lattice Boltzmann method

Rostamzadeh

Jafarpur

Rad

2016

jtam

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“…Particularly, nanofluids were highlighted after You et al [3] and Vassallo et al [4] showed a dramatic CHF enhancement by ~200% and ~60% using alumina (Al2O3)-water nanofluids and silica (SiO2)-water nanofluids, respectively. Since these initial findings, later studies [5][6][7][8][9][10] confirmed this CHF enhancement to various degrees using various nanofluids and heater geometries.…”

Section: Introductionmentioning

confidence: 89%

“…Then, researchers [9,10,13,14] made an effort to determine the mechanism of CHF enhancement. Sefiane [13] showed that CHF enhancement was related to structural disjoining pressure and contact angle pinning.…”

Section: Introductionmentioning

confidence: 99%

EFFECT OF SOLUBLE ADDITIVES, BORIC ACID (H₃BO₃) AND SALT (NaCl), IN POOL BOILING HEAT TRANSFER

Kwark¹,

Amaya²,

Moon³

et al. 2011

Nuclear Engineering and Technology

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“…Şekil 8'de görüldüğü gibi, nano akışkan deneyleri sonrasında yüzey temas açısı önemli ölçüde azalmıştır. Bazı araştırmacılar da temas açılarında düşüş gözlemişlerdir ki bu durum yüzeydeki aktif buhar çekirdeklerinin sayısında düşüşe neden olmuştur [12,20,[24][25][26][27]. Araştırmacılar düşük partikül konsantrasyonlarında bile (<0.01vol.%) CHF değerinde %250'ye varan önemli artışlar gözlemişlerdir [28][29][30].…”

Section: Hata Analizi (Error Analysis)unclassified

Küresel Yüzeyler Etrafinda Nano Akişkanlarda Havuz Kaynama Isi Transferi̇ni̇n Deneysel İncelenmesi̇

Çiloğlu¹,

Bölükbaşi²,

Çifci³

2015

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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ÖZETBu çalışmada, atmosfer basıncı altında ve doyma şartlarında nano akışkanlarla su verilerek soğutulan yüksek sıcaklıktaki küresel yüzeyler etrafında havuz kaynama ısı transferi deneysel olarak incelenmiştir. Deneylerde %0,01, %0,05 ve %0,1 olmak üzere üç farklı hacimsel konsantrasyonda saf su esaslı silika, alümina, titania ve bakır oksit nano akışkanları kullanılmıştır. Bronz malzemeden yapılmış küresel test numunesi yüksek sıcaklıklara kadar ısıtıldıktan sonra, doymuş şartlardaki nano akışkan süspansiyonlarına aniden daldırmıştır. Numuneye ait sıcaklık-zaman verileri ile soğuma eğrileri çizilmiş ve kaynama eğrileri elde edilmiştir. Deneysel sonuçlar, test numunesinin soğuma performansının nano akışkan tipine ve konsantrasyonuna bağlı olarak değiştiğini göstermiştir. İlk su verme testlerinde saf suya yakın değerler elde edilmesine rağmen, nano akışkanlarda tekrarlı testler ile soğuma süresinin önemli ölçüde kısaldığı görülmüştür. Bu etki nano partikül konsantrasyonuyla artmıştır. Özellikle silika nano akışkanı için tekrarlı su verme testleri ile film kaynama kaybolmuş ve kritik ısı akısı önemli derecede artmıştır. Deneysel sonuçlar, ayrıca, çekirdek havuz kaynama ısı transferinde tüm nano akışkanlar için önemli bir değişimin olmadığını göstermiştir. Sonuç olarak, nano akışkanlar ile su verme testleri sonrasında, test yüzeyi üzerinde biriken nano partiküllerin yüzeyin ıslatabilirliğini artırdığı ve böylece kritik ısı akısında artışa neden olduğu belirlenmiştir.Anahtar Kelimeler: Isı transferi, havuz kaynama, nano akışkanlar, küresel yüzeyler EXPERIMENTAL INVESTIGATION OF POOL BOILING HEAT TRANSFER IN NANOFLUIDS AROUND SPHERICAL SURFACES ABSTRACTIn this study, the pool boiling heat transfer around spherical surfaces with high temperature quenched by nanofluids at saturated conditions and under atmospheric pressure was experimentally investigated. In the experiments, pure water-based silica, alumina, titania and copper oxide nanofluids with three different volumetric particle concentrations (0.01, 0.05 and 0.1%) were used. After the spherical test specimen made up off brass material was heated at high temperatures, it was suddenly plunged into the nanofluid suspensions at saturated conditions. Using the temperature-time data of the specimen, the cooling curves were drawn and the boiling curves were obtained. The experimental results showed that the cooling performance of test specimen depended on the type of nanofluids and nanoparticle concentration. In the first quenching tests, although the cooling trend were nearly identical to that in pure water, it was observed that the cooling time was considerably shortened with the repetition tests in nanofluids. This effect enhanced with the nanoparticle concentrations. For silica nanofluids, especially, the film boiling region vanished during the repetition tests and the critical heat flux dramatically increased. The experimental results also showed that a considerable change in nucleate pool boiling heat transfer was not observed for all nanofluids. Consequently, it ...

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Experimental study of the characteristics and mechanism of pool boiling CHF enhancement using nanofluids

Cited by 134 publications

References 8 publications

Numerical investigation of pool nucleate boiling in nanofluid with lattice Boltzmann method

Numerical investigation of pool nucleate boiling in nanofluid with lattice Boltzmann method

EFFECT OF SOLUBLE ADDITIVES, BORIC ACID (H₃BO₃) AND SALT (NaCl), IN POOL BOILING HEAT TRANSFER

Küresel Yüzeyler Etrafinda Nano Akişkanlarda Havuz Kaynama Isi Transferi̇ni̇n Deneysel İncelenmesi̇

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Experimental study of the characteristics and mechanism of pool boiling CHF enhancement using nanofluids

Cited by 134 publications

References 8 publications

Numerical investigation of pool nucleate boiling in nanofluid with lattice Boltzmann method

Numerical investigation of pool nucleate boiling in nanofluid with lattice Boltzmann method

EFFECT OF SOLUBLE ADDITIVES, BORIC ACID (H3BO3) AND SALT (NaCl), IN POOL BOILING HEAT TRANSFER

Küresel Yüzeyler Etrafinda Nano Akişkanlarda Havuz Kaynama Isi Transferi̇ni̇n Deneysel İncelenmesi̇

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EFFECT OF SOLUBLE ADDITIVES, BORIC ACID (H₃BO₃) AND SALT (NaCl), IN POOL BOILING HEAT TRANSFER