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An experimental comparison of water based alumina and silica nanofluids heat transfer in laminar flow regime

Journal of Central South University 2013年第12期20卷 3582-3588页

作者： Azari Ahmad kalbasi mansour Derakhshandeh Masoud Depertment of Petrochemical Engineering Amirkabir University of Technology (Tehran Polytechnic)Mahshahr Campus

Experimental investigations were carried out to determine the Al2O3/water and SiO2/water nanofluids flowing through a circular tube. convective heat transfer performance and pressure drop of Measurements show that the addition of small amounts of nano-sized Al2O3 particles to the base fluid increases heat transfer coefficients considerably, while the result for the silica nanofluids contradicts with the alumina nanofluids and this leads to some interesting results. In the case of alumina nanofluids, an average increase of 16% in convective heat transfer coefficient is observed with an average penalty of 28% in pressure drop. Moreover, flow resistance increases significantly compared to the base fluid even at very low concentrations of nanofluids. Finally, measured heat transfer coefficients are compared with predicted ones from the correlation of Shah under the same conditions.

关键词： convection forced convection heat transfer nano scale heat transfer

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Effect of nanoparticle diameter on the forced convective heat transfer of nanofluid(water+Al_(2)O_(3))in the fully developed laminar region

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International Journal of Modeling, Simulation, and Scientific Computing 2014年第3期5卷 104-114页

作者： Seyyed Shahabeddin Azimi mansour kalbasi Mohammad Hosain Namazi Department of chemical Engineering Amirkabir University of Technology Hafez Avenue Tehran Iran

Nanofluid is a suspension of nanoparticles(solid particles with diameters below 100 nm)in a conventional base fluid with significantly improved heat transfer characteristics compared to the original *** heat transfer coefficient is a quantitative characteristic of the convective heat *** purpose of this paper is to study the effect of the nanoparticle size(diameter)on the heat transfer coefficient of forced convective heat transfer of nanofluid in the fully developed laminar region of a horizontal *** thermal conductivity model which is a function of the nanoparticle size,flow of a nanofluid(water+Al2O3)in a circular tube submitted to a constant wall temperature is numerically investigated with two particle sizes of 11 nm and 47 *** calculated results show that the nanoparticle size does not significantly affect the heat transfer coefficient,however,the heat transfer coefficient decreases as the particle size increases.

关键词： Nanoparticle volume fraction particle size heat transfer coefficient

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An Experimental Study on Nanofluids Convective Heat Transfer Through a Straight Tube under Constant Heat Flux

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Chinese Journal of Chemical Engineering 2013年第10期21卷 1082-1088页

作者： Ahmad Azari mansour kalbasi Masoud Derakhshandeh Masoud Rahimi Department of Petrochemical Engineering Amirkabir University of Technology (Tehran Polytechnic) MahshahrCampus Mahshahr EO. Box 415 Iran CFD-Research Center Chemical Engineering Department Razi University TagheBostan Kermanshah Iran

In this work, the laminar convective heat transfer performance and the pressure drop of water-based nanofluids containing Al2O3, TiO2 and SiO2 nanoparticles flowing through a straight circular tube were experimentally investigated. The experimental results showed that addition of small amounts of nano-sized Al2O3 and TiO2 particles to de-ionized water increased heat transfer coefficients considerably, while the SiO2 nanofluids showed the opposite behavior attracting the authors' interests. An average of 16% and 8.2% increase in heat transfer coefficient were observed with the average of 28% and 15% penalty in pressure drop for Al2O3 and TiO2 nanofluids.

关键词： convection Iorced convection heat transfer nanopartlcles nanotlulCls

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