Experimental investigation of thermal radiative properties of Al2O3-paraffin nanofluid


WANG Q., WEI W., Lİ D., QI H., WANG F., ARICI M.

SOLAR ENERGY, cilt.177, ss.420-426, 2019 (SCI İndekslerine Giren Dergi)

Özet

The thermal radiative properties of nanofluids have considerable contribution to the effectiveness of harvesting solar energy. In this work, the thermal radiative properties of Al2O3-paraffin nanofluid were experimentally investigated in terms of the influence of volume concentration, nanoparticle size, temperature and optical path. The transmittance spectrums of Al2O3-paraffin nanofluid were measured by a TU-19 FTIR spectrometer which was used for the calculation for the absorption coefficient and reflectivity of nanofluid. The experimental results show that Al2O3-paraffin nanofluid performs excellent ability to absorb solar energy compared to pure paraffin, with higher absorption coefficients increased up to 15.5 times at volume concentration 0.01%. The reflectivity of nanofluid is sensitive to nanoparticle size. When the nanoparticle size decreases from 30 to 10 nm the reflectivity of Al2O3-paraffin nanofluid reduces about 37.04%. With increasing temperature, the absorption coefficient of Al2O3-paraffin nanofluid increases and the reflectivity accordingly decreases.