Iranian Nanotechnology Society International Journal of Nanoscience and Nanotechnology 1735-7004 10 2 2014 06 01 Entropy Generation Analysis of EG – Al2O3 Nanofluid Flows through a Helical Pipe 103 110 6115 EN A. Zamzamian Materials and Energy Research Center (MERC), Karaj, I. R. Iran Journal Article 2013 12 01 fluids for various industrial applications because of their excellent thermal performance. This study analytically and experimentally examines the effects of nanoparticle dispersion on the entropy generation of EG–Al2O3 nanofluid flows through a helical pipe as a heat exchanger under constant wall heat flux thermal boundary condition in laminar regime. It is found that adding nanoparticles improves the thermal performance of EG–Al2O3 flow with Re numbers less than 3700. On the other hand the results shows that adding the 5% by volume Al2O3 nanoparticles in the EG in Dean numbers less than 100 can decrease the entropy generation by 4.511%. Also it is shown that adding nanoparticles leads to increase entropy generation in the cases that fluid flow (pressure drop) irreversibility is dominant. Moreover, optimum conditions of radius ratio and Dean Numberfor laminar nanofluid flow are obtained

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