Experimental investigation on thermophysical properties of functionalized TiO۲-water nanofluids

Nanofluids are a new class of nanotechnology-based heat transfer fluids produced by dispersing nanoparticles with sizes typically smaller than ۱۰۰ nm into traditional heat transfer fluids such as water, ethylene glycol, and engine oil. Due to small sizes and very large specific surface areas of the nanoparticles, nanofluids have novel beneficial properties [۱, ۲]. In order to study the heat transfer performance of nanofluids and use them in practical applications, it is necessary first to study their thermophysical properties.In this paper the four main thermophysical properties, i.e. density, specific heat capacity, thermal conductivity, and viscosity of TiO۲-water nanofluids at various particle volume concentrations and temperatures is measured experimentally. As the purchased nanoparticles had a hydrophobic surface, at first the TiO۲ nanoparticles are functionalized by a new chemical treatment and then dispersed in water. Furthermore, the measured data are used for comparison with the predicted values of the existing classical models.

کلیدواژه ها:

Experimental study ، Functionalization ، Nanofluids ، Thermophysical properties