Effect of Base-Fluids on Thermo-Physical Properties of SiO2 Nano-Fluids
and Development of New Correlations
Abstract
The enhanced thermal properties being the prominent objective behind the
usage of nanofluids. Hence it is necessary to study the base/nanofluid
physical properties at various conditions. This article projects the
experimental results of thermal conductivity and viscosity of two
different nanofluids. The ratio was considered as 60:40 and 40:40 by
volume in water and ethylene glycol respectively. The preparation of
nanofluids was started by scattering SiO2 nano-particles in EG and
“water” (W) blended in “60:40” (60EGW) and “40:60” (40EGW) ratio
by volume. The ratio was considered as 60:40 and 40:40 by volume in
water and ethylene glycol respectively. The regression analysis was
conducted with available data and correlations were formulated for
thermal properties. The nanofluids were used in evaluating “viscosity”
and “thermal conductivity” experimentally. From the results, the SiO2
particles have achieved enhancement of 34% and 32% in thermal
conductivity with the two base-fluids. Similarly, enhancement of 102%
and 62% were reported in viscosity. Hence, it can be observed that SiO2
nanofluids in 40EGW nanofluid are a better heat transfer fluid when
compared to SiO2 in 60EGW nanofluid.