Effect of nonionic surfactant additives on the performance of nanofluid in the heat exchanger

A nanofluid is mixture of nano sized particles and a base fluid. This paper investigates by using laboratory based double pipe heat exchanger model, the performance of nanofluid containing about ۴۸.۴۶nm  particle size nanoparticles (ZnO) without or with addition of nonionic surfactant Rokanol K۷ (۵۰۰ppm) into the base fluid double distilled water to prepared three different concentrations ۱.۰%, ۲% and ۳% (v/v) of ZnO-water or ZnO-RK۷. Effects of temperature and concentration of nanoparticles on viscosity and heat transfer coefficient in heat exchanger are investigated. The experimental results shows that the viscosity of nanofluids increased with increasing concentration of fluid whereas decreased with increasing temperature from ۲۰ to ۶۰ºC. However, it has been also observed that heat transfer coefficient increases with the operating temperature and concentration of nanoparticles. The conclusion derived for the study is that overall heat transfer coefficient enhanced with increasing concentration upto ۳% of ZnO-RK۷ as compared to without surfactant nanofluids.

کلیدواژه ها:

heat exchanger ، Heat Transfer Coefficient ، nanofluid ، Nonionic surfactant ، Viscosity