Entropy Generation Analysis of EG – Al2O3 Nanofluid Flows through a Helical Pipe

Abstract

<span style="font-size: small;"><em>fluids for various industrial applications because of their excellent thermal performance. This study analytically</em><em> </em><em>and experimentally examines the effects of nanoparticle dispersion on the entropy generation of EG–Al</em></span><em>2</em><em><span style="font-size: small;">O</span></em><em>3</em><em> </em><span style="font-size: small;"><em>nanofluid flows through a helical pipe as a heat exchanger under constant wall heat flux thermal boundary</em><em> </em><em>condition in laminar regime. It is found that adding nanoparticles improves the thermal performance of EG–Al</em></span><em>2</em><em><span style="font-size: small;">O</span></em><em>3 </em><span style="font-size: small;"><em>flow with Re numbers less than 3700. On the other hand the results shows that adding the 5% by volume</em><em> </em><em>Al</em></span><em>2</em><em><span style="font-size: small;">O</span></em><em>3 </em><span style="font-size: small;"><em>nanoparticles in the EG in Dean numbers less than 100 can decrease the entropy generation by 4.511%.</em><em> </em><em>Also it is shown that adding nanoparticles leads to increase entropy generation in the cases that fluid flow</em><em> </em><em> (pressure drop) irreversibility is dominant. Moreover, optimum conditions of radius ratio and Dean Numberfor laminar nanofluid flow are obtained</em></span>