TY - JOUR
TI - Experimental studies on the viscosity of Fe nanoparticles dispersed in ethylene glycol and water mixture
AU - Karimi Amir
AU - Abdolahi Sadatlu Mohamad Amin
AU - Ashjaee Mehdi
JN - Thermal Science
PY - 2016
VL - 20
IS - 5
SP - 1661
EP - 1670
PT - Article
AB - In this paper, experimental studies are conducted in order to measure the  viscosity of Fe nanoparticles dispersed in various weight concentration  (25/75%, 45/55% and 55/45%) of ethylene glycol and water (EG-water) mixture.  The experimental measurements are performed at various volume concentrations  up to 2% and temperature ranging from 10°C to 60°C. The experimental results  disclose that the viscosity of nanofluids increases with increase in Fe  particle volume fraction, and decreases with increase in temperature. Maximum  enhancement in viscosity of nanofluids is 2.14 times for 55/45% EG-water  based nanofluid at 2% volume concentration compared to the base fluid.  Moreover, some comparisons between experimental results and theoretical  models are drawn. It is also observed that the prior theoretical models do  not estimate the viscosity of nanofluid accurately. Finally, a new empirical  correlation is proposed to predict the viscosity of nanofluids as a function  of volume concentration, temperature, and the viscosity of base fluid.