Thermophysical properties of nanosilica-in-fluid dispersion (nanofluid) derived from rice hull ash.

摘要: The study aimed to find an alternative way of enhancing the thermal properties heat transfer fluids, and utilizing agricultural by-products such as rice hull ash (RHA) which has been proven be viable low cost source nanosilica silica particles. Fluids with nano-scaled particles form a stable suspension provide impressive improvements in base fluids. Nanofluid was prepared by dispersing powder from into deionised water fluid. SEM analysis gave size range 40 65 nm. stability nanofluids based on sediment photography UV-Vis spectrophotometry showed that 1, 2 3% volume concentration were without significant sedimentation for 5 d compared nanofiuids 4 5% only. Measured density did not vary much relative An increase dynamic viscosity observed nanosilica-in-fluid dispersion (nanofluids) 202%. specific formulated five concentrations decreased 3-25% enhancement conductivity reached 50% after at different measured temperatures ranging 30-70 degrees C. thermophysical suggest potential use