Heat Transfer of Nanofluid in a Double Pipe Heat Exchanger

Reza Aghayari; Heydar Maddah; Malihe Zarei; Mehdi Dehghani; Sahar Ghanbari Kaskari Mahalle

doi:10.1155/2014/736424

Heat Transfer of Nanofluid in a Double Pipe Heat Exchanger

Int Sch Res Notices. 2014 Nov 10:2014:736424. doi: 10.1155/2014/736424. eCollection 2014.

Authors

Reza Aghayari¹, Heydar Maddah², Malihe Zarei¹, Mehdi Dehghani³, Sahar Ghanbari Kaskari Mahalle⁴

Affiliations

¹ Department of Chemical Engineering, Shahrood Branch, Islamic Azad University, Shahrood 36199-43189, Iran.
² Department of Chemistry, Sciences Faculty, Arak Branch, Islamic Azad University, Arak, Iran.
³ Department of Chemical Engineering, Damghan Branch, Islamic Azad University, Damghan 36716-39998, Iran.
⁴ Department of Chemistry, Saveh Branch, Islamic Azad University, Saveh 39197-15179, Iran.

Abstract

This paper investigates the enhancement of heat transfer coefficient and Nusselt number of a nanofluid containing nanoparticles (γ-AL2O3) with a particle size of 20 nm and volume fraction of 0.1%-0.3% (V/V). Effects of temperature and concentration of nanoparticles on Nusselt number changes and heat transfer coefficient in a double pipe heat exchanger with counter turbulent flow are investigated. Comparison of experimental results with valid theoretical data based on semiempirical equations shows an acceptable agreement. Experimental results show a considerable increase in heat transfer coefficient and Nusselt number up to 19%-24%, respectively. Also, it has been observed that the heat transfer coefficient increases with the operating temperature and concentration of nanoparticles.