Numerical studies on heat transfer enhancement and synergy analysis on few metal oxide water based nanofluids

摘要

Addition of nanoparticles provides an effective way of improving heat transfer characteristics of fluids. The thermophysical properties of nanofluids are strongly dependent on the nanoparticle volume fraction and nanoparticle type. So far it has been an unsolved problem to develop a sophisticated theory to accurately predict the thermophysical properties of nanofluids, although there are some semi empirical correlations to calculate the apparent conductivity and viscosity of two-phase mixture. In this article several metal oxide particles were considered and the nanofluid heat transfer enhancement will be compared and results will be interpreted for turbulent flow and low Pr number. After generating results, one can notice that the heat transfer enhancement is strongly dependent on nanoparticle type, Reynolds number and volume fraction. The best results were obtained for alumina water nanofluid. Moreover, the field synergy was discussed in terms of Re number and nanoparticle type and volume concentration.