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THE IMPACT OF ALUMINA NANOPARTICLES SUSPENDED IN ETHYLENE GLYCOL ON THE PERFORMANCE EFFICIENCY OF A DOUBLE PIPE HEAT EXCHANGER

Firas Aziz Ali, Adnan M. Alsaffawi, Karam Hashim Mohammed
Frontiers in Heat and Mass Transfer (FHMT) 15 - 21 (2020)


Abstract


The augmentation of the heat transfer in heat exchangers is one of the methods to increase efficiency of the system. The double tube heat exchanger is selected to many suitable techniques of heat transfer enhancement. In this study; the friction factor and heat transfer coefficient of double tube is evaluated experimentally. The Al2O3 nanoparticles dispersed in ethylene glycol (EG) with a diameter 50 nm and the weight concentration (0.1%, 0.3%, 0.5%, 0.7%, 1%) has been utilized. Then the effect of parallel current and counter current with different ranges of Reynolds number (10,000 to 30,000) on the friction factor and heat transfer coefficient experimentally examined then selected the best current flow. Thermophysical properties (density, viscosity) are measured and validated with experimental data of the other researches. Result showed that the friction factor decreases with increasing of Reynolds number and increases with increasing of weight concentration but Nusselt number increases with increasing of Reynolds number and concentration of weight. It was concluded that the utilizing of alumina nanoparticles suspended in EG through a double pipe heat exchanger is significant enhancement of heat transfer. The results indicate that the alumina dispersed in EG nanofluid can enhance thermophysical properties of EG to 20%. Likewise, the friction factor is slightly higher than that of pure EG and the nanofluid heat transfer is higher than the pure EG.

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DOI: http://dx.doi.org/10.5098/hmt.15.21

ISSN: 2151-8629