On the quenching of steel and zircaloy spheres in water-based nanofluids with alumina, silica and diamond nanoparticles

Kim, Hyungdae; Dewitt, G.; McKrell, Thomas; Buongiorno, Jacopo; Hu, Lin‐Wen

doi:10.1016/j.ijmultiphaseflow.2009.02.004

Cited by 179 publications

(68 citation statements)

References 23 publications

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“…The nanoparticle deposition layer was found to increase the surface roughness and wettability, both of which could be linked to CHF enhancement and quenching acceleration. Kim et al [3] observed that nanoparticles dispersed in the fluid at low concentration (< 0.1 %) did not change the quenching process. Nanoparticles deposited on the rodlet surface are responsible for accelerated quenching.…”

Section: Introductionmentioning

confidence: 99%

“…The term was first introduced by Das et al [1] in 1995. Nanoparticles dispersed in base fluid can be metal oxides, such as CuO, Al 2 O 3 and TiO 2 [2][3][4][5] and for base fluid, most commonly deionized or fresh water is used. Today there is no exact confirmed theoretical background available that would explain all nanofluid properties.…”

Section: Introductionmentioning

confidence: 99%

“…Nanofluids are of interest to a variety of industry branches due to a wide range of possible applications such as heat transfer applications, automotive, electronics and biomedical applications. At MIT [3] quenching of steel and zircaloy spheres in nanofluids with 0.1 % Al 2 O 3 was studied. They reported that the main reason for quenching acceleration is the surface roughness increase and the wettability enhancement due to nanoparticle deposition.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of quenching behavior of heated zircaloy rod in accidental condition of nuclear reactor with water and water based nanofluids

Chinchole¹,

Kulkarni²,

Nayak³

2016

Nanosystems: Phys. Chem. Math.

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The physical phenomena of rewetting and quenching are of prime importance in nuclear reactor safety in the event of Loss of Coolant Accident (LOCA). In such a case, the fuel pins become dry hot. Under this condition, cold water is injected from emergency core cooling system (ECCS). The quenching behavior of such heated rod bundle (re-flood heat transfer behavior) is quite complex. It is well known that Nanofluids have better heat removal capability and a high heat transfer coefficient owing to their enhanced thermal properties. Recent investigations have shown that the addition of the Al 2 O 3 nanoparticles result in better cooling capabilities as compared to the traditionally used quenching media. In this context, the authors have carried out experiments on quenching behavior of hot zircalloy tube with water and nanofluids as stated above. Quenching of the tube was observed to occur within few seconds in both the cases in the presence of decay heat. It was also observed that the nanofluids showed slightly reduced quenching time as compared to water.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of quenching behavior of heated zircaloy rod in accidental condition of nuclear reactor with water and water based nanofluids

Chinchole¹,

Kulkarni²,

Nayak³

2016

Nanosystems: Phys. Chem. Math.

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“…Gıda sektöründe ise sıvı karbondioksit (kuru buz) içerisinde soğutulmak suretiyle birçok yiyecek şoklanmaktadır. Diğer taraftan, su verme işlemi nükleer reaktörlerde soğutucu akışkanın azalması halinde meydana gelebilecek kazaların azaltılmasında önemli bir rol oynamaktadır [2]. Böyle bir reaktörde soğutucu akışkanın yetersiz kalması halinde yakıt sıcaklığı çok yüksek sıcaklıklara çıkabilir (>1000 o C).…”

Section: Gi̇ri̇ş (Introduction)unclassified

“…Daha iyi ısı transferi için birçok uygulamada film kaynamadan çekirdek kaynamaya hızlı bir geçişin olması istenir. Nano akışkanların bu geçişi hızlandıracağı ve ısı transferini iyileştireceği düşünülmektedir [2]. …”

Section: Gi̇ri̇ş (Introduction)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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Critical heat flux enhancement in pool-boiling heat transfer using oxidized multi-wall carbon nanotubes

Park

Kim

2015

Int. J. Energy Res.

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Summary In this study, the critical heat flux (CHF) and heat‐transfer coefficient under the pool‐boiling state were tested using multi‐wall carbon nanotubes (MWCNT) CM‐95, CM‐100, and oxidized MWCNT CM‐100. The results showed that the highest CHF increase for both MWCNT CM‐95 and CM‐100 was at the volume fraction of 0.001%, and that the CHF increase ratio for MWCNT CM‐100 nanofluid with long particles was higher than that for MWCNT CM‐95 nanofluid with short particles. In addition, at the volume fraction of 0.001%, the oxidized MWCNT CM‐100 nanofluid indicated a 47.27% higher CHF‐increase ratio as well as an approximately 21.04% higher heat‐transfer coefficient increase ratio compared with the MWCNT CM‐100 nanofluid without oxidation treatment. Copyright © 2015 John Wiley & Sons, Ltd.

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On the quenching of steel and zircaloy spheres in water-based nanofluids with alumina, silica and diamond nanoparticles

Cited by 179 publications

References 23 publications

Experimental investigation of quenching behavior of heated zircaloy rod in accidental condition of nuclear reactor with water and water based nanofluids

Experimental investigation of quenching behavior of heated zircaloy rod in accidental condition of nuclear reactor with water and water based nanofluids

Küresel Yüzeyler Etrafinda Nano Akişkanlarda Havuz Kaynama Isi Transferi̇ni̇n Deneysel İncelenmesi̇

Critical heat flux enhancement in pool-boiling heat transfer using oxidized multi-wall carbon nanotubes

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