An explanation of the Al2O3 nanofluid thermal conductivity based on the phonon theory of liquid

Energy ◽  
2016 ◽  
Vol 116 ◽  
pp. 786-794 ◽  
Author(s):  
Fabrizio Iacobazzi ◽  
Marco Milanese ◽  
Gianpiero Colangelo ◽  
Mauro Lomascolo ◽  
Arturo de Risi
Keyword(s):  
Thermal Conductivity ◽  
Phonon Theory ◽  
Al2o3 Nanofluid

Dispersion and Thermal Conductivity of Al2O3 and TiO2 Binary Nanofluids

2012 ◽  
Vol 531-532 ◽  
pp. 442-445 ◽  
Author(s):  
Liu Yang ◽  
Kai Du
Keyword(s):  
Thermal Conductivity ◽  
Effective Thermal Conductivity ◽  
Storage Time ◽  
Nano Particles ◽  
Dispersion Stability ◽  
Hot Wire ◽  
Ammonia Content ◽  
Wire Method ◽  
Al2o3 Nanofluid

The dispersion stabilities and thermal conductivities of Al2O3 and TiO2 ammonia water nanofluids are investigated by the absorbency index methods and transient double-hot-wire method, respectively. The results show that the dispersion stabilities of the two kinds of binary nanofluids are greatly improved by adding surfactants or increasing the ammonia content. The effective thermal conductivity ratios of the two kind of binary nanofluids increase with the increase of the content of nano-particles. It is the same with the increase of the ammonia content. The thermal conductivity will decrease with the rising of storage time by the role of natural sedimentation. The thermal conductivity of TiO2 nanofluid is more insensitive to the storage time than Al2O3 nanofluid because of its better dispersion stability

scholarly journals Thermal Conductivity Enhancement of Al2O3 Nanofluid in Ethylene Glycol and Water Mixture

2015 ◽  
Vol 79 ◽  
pp. 397-402 ◽  
Author(s):  
N.A. Usri ◽  
W.H. Azmi ◽  
Rizalman Mamat ◽  
K. Abdul Hamid ◽  
G. Najafi
Keyword(s):  
Thermal Conductivity ◽  
Ethylene Glycol ◽  
Thermal Conductivity Enhancement ◽  
Water Mixture ◽  
Conductivity Enhancement ◽  
Al2o3 Nanofluid

An Experimental Investigation of Properties of Nanofluid and Its Performance on Thermosyphon Cooled by Natural Convection

2019 ◽  
Vol 11 (4) ◽  
Author(s):  
Sidhartha Das ◽  
Asis Giri ◽  
S. Samanta ◽  
S. Kanagaraj
Keyword(s):  
Thermal Conductivity ◽  
Surface Tension ◽  
Contact Angle ◽  
Experimental Investigation ◽  
Natural Convection ◽  
Thermal Resistance ◽  
Al2o3 Nanoparticles ◽  
Water Based ◽  
Lower Heat ◽  
Al2o3 Nanofluid

An attempt is made here to characterize thermal conductivity of water-based Al2O3 nanofluid and then use the same in a circular finned thermosyphon (TPCT) to measure its thermal performance. The concentration of Al2O3 nanofluid is varied within 0.05–0.25% by volume. The thermal conductivity of nanofluid is increased with concentration of Al2O3 nanoparticles as well as with temperature. A maximum of 26.7% enhancement of thermal conductivity is observed at 45 °C for 0.25% concentration by volume of nanofluid in comparison to that of de-ionized (DI) water. Variations of surface tension and contact angle of Al2O3 nanofluid are also compared with DI water. One of the smallest TPCT with different heat inputs (4 W, 8 W, and 12 W) and different inclinations (30 deg, 45 deg, 60 deg, and 90 deg) is tested for different concentration of Al2O3 nanofluid, which will find application in smaller electronic units. It is found that use of nanofluid decreases the wall temperature distribution of TPCT. Thermal resistance of TPCT decreases whenever TPCT is filled with nanofluid and a maximum of 36.4% reduction in thermal resistance is noted for 0.25% volume of nanoparticles at 4 W with an inclination of 60 deg. It is also found that performance of TPCT is higher at 60 deg inclination compared to other inclinations, especially for lower heat input.

scholarly journals A Recent Examination on the Performance of Heat Exchangers using Al2O3 Nanofluid with Its Thermo Physical Properties

2019 ◽  
Vol 9 (1S4) ◽  
pp. 653-656
Keyword(s):  
Thermal Conductivity ◽  
Physical Properties ◽  
Heat Exchangers ◽  
Preparation Method ◽  
Industrial Sites ◽  
Experimental Works ◽  
Alumina Nanofluid ◽  
Thermo Physical Properties ◽  
Al2o3 Nanofluid

Heat exchangers are the most significant equipment used in the industrial sites for exchanging the useful energy for many applications. It may be used either for cooling or heating but in the industrial scenario, it mostly used for cooling. In the current research development, the nanoparticles of different high thermal conductivity metals have been prepared and introduced in the low thermal performance base fluids like water, oil, ethylene glycol to enhance its quality of heat absorption in the heat exchangers. In that alumina nanoparticle played a significant role in many research applications and it has good thermal conductivity as a pure fluid. So, in this review work, the recent study of Al2O3 nanofluid with its preparation method, thermo-physical properties and its performance in varied heat exchangers have been discussed. This would enrich the knowledge and help the researchers who are interested in alumina nanofluid for their experimental works.

scholarly journals Thermal conductivity difference between nanofluids and micro-fluids: Experimental data and theoretical analysis using mass difference scattering

2019 ◽  
Vol 23 (6 Part B) ◽  
pp. 3797-3807
Author(s):  
Fabrizio Iacobazzi ◽  
Gianpiero Colangelo ◽  
Marco Milanese ◽  
Risi de
Keyword(s):  
Experimental Data ◽  
Thermal Conductivity ◽  
Theoretical Analysis ◽  
Metal Oxides ◽  
Mass Difference ◽  
Deionized Water ◽  
Experimental Results ◽  
Experimental Campaign ◽  
Nanometric Particles ◽  
Phonon Theory

In this work, an experimental campaign on different nanofluids and micro-fluids, obtained by the dispersion of three different metal oxides (CuO, ZnO, and TiO2) with diathermic oil or deionized water has been carried out, in order to extend phonon theory to liquids, as already done in a previous work on Al2O3. Thermal conductivity of stable samples was evaluated by time. The experimental results on thermal conductivity of stable micrometric and nanometric particles suspensions in oil and water showed a further proof of mass difference scattering phenomenon.

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