Abstract:
Nanofluids are emerging as promising heat transfer fluids for the next generation
cooling systems by providing impressive thermo-physical properties. Thermal
conductivity stands out as a critical property that underscores the potential of
nanofluids as alternative coolants for various industrial applications, including
solar
thermal collectors, HVAC systems (Heating, Ventilation, Air
Conditioning), and automotive systems. Many recent research studies have
focused on developing a nanofluid with optimum thermal properties for heat
transfer applications. However, there are a number of challenges to overcome
when using nanofluids in cooling applications such as particle sedimentation,
clogging, higher cost and health concerns. Thus, it's very imperative to study the
behavior of thermo-physical properties of water based nanofluids since water is
the most commonly used heat transfer fluid in industrial applications due to its
superior thermo-physical properties. In this study, the influence on the thermal
conductivity of TiO2/Water nanofluid was observed for different TiO2 nano
particle concentrations. Nanofluid samples were prepared following the two-step
preparation method using TiO2 anatase-type nanopowder, dispersed in distilled
water with four different volume fractions 0.05%, 0.1%. In preparation of
nanofluid samples, magnetic stirring was carried out for 1 hour at 40℃
temperature with 600 rpm and each sample was sonicated for 2 hours in the bath
type ultrasonicator at 40℃ temperature to increase the stability of samples. The
thermal conductivity of nanofluid samples with different volume fractions was
measured by a lambda thermal conductivity meter using the hot -wire resistance
method according to the ASTM D7896-19 standards. The thermal conductivity
measurements were collected in the temperature range of 35℃ to 70℃. The
experimental data indicated that TiO2/Water nanofluids showed higher thermal
conductivity than distilled water for all volume concentrations.
