Influence of nanoparticle surface coating on pool boiling

Stutz, Benoı̂t; Morceli, Carlos Henrique Silveira; Silva, Maria de Fátima; Cioulachtjian, Serge; Bonjour, Jocelyn

doi:10.1016/j.expthermflusci.2011.04.011

Cited by 80 publications

(24 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Stutz et al [67] performed experiments to examine the effects on boiling heat transfer and CHF of surface coated with γ-Fe 2 O 3 nanoparticles on a platinum wire immersed in saturated water or pentane under atmospheric pressure. Huang et al [68] produced TiO 2 nanoparticlecoated nickel wires by using electrical heating in various nanofluid concentrations in an SS test pool (Ø210x320mm).…”

Section: Suriyawong and Wongwisesmentioning

confidence: 99%

A comprehensive review on pool boiling of nanofluids

Çiloğlu

Bölükbaşi

2015

Applied Thermal Engineering

136

View full text Add to dashboard Cite

Section: Suriyawong and Wongwisesmentioning

confidence: 99%

A comprehensive review on pool boiling of nanofluids

Çiloğlu

Bölükbaşi

2015

Applied Thermal Engineering

136

View full text Add to dashboard Cite

“…Local surface deficiencies produced during the nanoparticle layer detachment at this concentration had negative effect on two phase heat transfer [41]. In addition, the presence of surfactants and the surface contamination may obstruct working fluid movement and liquid stirring which indicates that NFs are not beneficial for the heat pipe performance at all concentrations.…”

Section: Resultsmentioning

confidence: 99%

“…It is reported that the presence of this layer alters the surface wettability and roughness and number of nucleation site present on the surface [29][30][31][32][33][34][35][36][37]. The reduction in evaporator wall temperature for decreasing heat flux at heat pipe with 5 wt.% of NF compared with other cases may be attributed to the effect of NFs on vapor bubble formation by bombarding the vapor bubbles by nanoparticles during their formation [38], the increase of active nucleation site density and bubble departure frequency [28,[39][40][41]. In fact, the problem of blocking the liquid to be supplied to the entire evaporator surface at higher heat fluxes may be eliminated by bombarding the vapor bubbles during their formation with nanoparticles.…”

Section: Resultsmentioning

confidence: 99%

Thermal performance of screen mesh heat pipe with Al2O3 nanofluid

Ghanbarpour

Nikkam

Khodabandeh

et al. 2015

Experimental Thermal and Fluid Science

View full text Add to dashboard Cite

a b s t r a c tThis study presents the effect of Al 2 O 3 nanofluid (NF) on thermal performance of screen mesh heat pipe in cooling applications. Three cylindrical copper heat pipes of 200 mm length and 6.35 mm outer diameter containing two layers of screen mesh were fabricated and tested with distilled water and water based Al 2 O 3 NF with mass concentrations of 5% and 10% as working fluids. To study the effect of NF on the heat pipes thermal performance, the heat input is increased and then decreased consecutively and the heat pipes surface temperatures are measured at steady state conditions. Results show that using 5 wt.% of Al 2 O 3 NF improves the thermal performance of the heat pipe for increasing and decreasing heat fluxes compared with distilled water, while utilizing 10 wt.% of Al 2 O 3 NF deteriorates the heat pipe thermal performance. For heat pipe with 5 wt.% Al 2 O 3 NF the reduction in thermal resistance of the heat pipe is found to be between 6% and 24% for increasing and between 20% and 55% for decreasing heat fluxes, while the thermal resistance increased between 187% and 206% for increasing and between 155% and 175% for decreasing steps in heat pipe with 10 wt.% of Al 2 O 3 NF.

show abstract

“…Şekil 7'de görüldüğü gibi, özellikle silika deneyleri sonrasında numune yüzeyinde görünür ancak homojen olmayan bir nano partikül tabakası tespit edilmiş ve yüzey karakteristiklerinde önemli değişiklik meydana gelmiştir. Bu nedenle, soğuma eğrilerindeki sapmanın (erken soğumanın) temel sebebi, nano akışkanlarla değil değişen yüzey karakteristikleriyle ilgilidir [20][21][22][23]. Bu durumu doğrulamak için test numunesinin yüzeyinden temas açıları (θ) ölçülmüştür (KSV, Cam-101 Scientific Inst.).…”

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

View full text Add to dashboard Cite

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 ...

show abstract

Influence of nanoparticle surface coating on pool boiling

Cited by 80 publications

References 22 publications

A comprehensive review on pool boiling of nanofluids

A comprehensive review on pool boiling of nanofluids

Thermal performance of screen mesh heat pipe with Al2O3 nanofluid

Küresel Yüzeyler Etrafinda Nano Akişkanlarda Havuz Kaynama Isi Transferi̇ni̇n Deneysel İncelenmesi̇

Contact Info

Product

Resources

About