Author/Authors :
-، - نويسنده Department of Chemical Engineering, Priyadarshini Institute of Engineering and Technology, Nagpur-440 019 (M.S.), India Lakhawat, Gajanan P , -، - نويسنده Department of Chemical Engineering, Laxminarayan Institute of Technology, Nagpur-440 033 (M.S.), India Ugwekar, Rajendra P , -، - نويسنده Department of Biotechnology, Priyadarshini Institute of Engineering and Technology, Nagpur-440 019 (M.S.), India Suke, Sanvidhan G , -، - نويسنده Department of Physics, Priyadarshini Institute of Engineering and Technology, Nagpur-440 019 (M.S.), India Nanoti, Vivek M
Abstract :
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 48.46nm particle size nanoparticles (ZnO) without or with addition of nonionic surfactant Rokanol K7 (500ppm) into the base fluid double distilled water to prepared three different concentrations 1.0%, 2% and 3% (v/v) of ZnO-water or ZnO-RK7. 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 20 to 60ºC. 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 3% of ZnO-RK7 as compared to without surfactant nanofluids.
