Convection heat transfer with water based mango bark nanofluids

Numerous studies reveal that the heat transfer capability of thermal systems has been significantly enhanced with the use of nanofluids. On the other hand, the hazardous nature of the nanoparticles is evident. Recent studies clearly indicate that the nanoparticles affect the human health as well as the environment. Therefore environmentally safe bio-nanofluids are currently under investigation. In this study, a novel heat transfer fluid with bio-nanomaterial is prepared and its natural convection heat transfer characteristics are studied. The bionanomaterial considered in this study is powdered mango bark. A two-step process is employed to prepare stable nanofluids. The effect of particles concentration, the temperature difference between the hot and cold side, and Rayleigh number on the natural convection heat transfer process is studied. The experimental results show that the natural convection process is deteriorated with the addition of mango nanoparticles in deionized water.Papers presented at the 13th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Portoroz, Slovenia on 17-19 July 2017 .International centre for heat and mass transfer.American society of thermal and fluids engineers

Thermal conductivity and viscosity of mango bark/water nanofluids

A novel heat transfer fluid with bio-nanomaterial, which is environmentally safe, is prepared and its thermo-physical properties such as thermal conductivity and viscosity are measured. The bio-nanomaterial considered in this study is mango bark. A two-step process is employed to prepare a stable nanofluid. The average particle size was measured using scanning electron microscope and is found to be 100nm. The stability of the nanofluid is checked by measuring the absorbance and viscosity at a constant temperature. The concentration of nanofluid and temperature are varied between 0.1 to 1 vol% and 10 to 60 oC, respectively for the measurement of viscosity and thermal conductivity. The measurement shows that the measured thermal conductivity of the water is comparable with the standard data presented by American Institute of Physics and American Chemical Society. Also, the measured thermal conductivity of the nanofluids showed a slight enhancement compared to the thermal conductivity of water. The measured viscosity of the nanofluids shows exponentially decreasing trend.Papers presented at the 13th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Portoroz, Slovenia on 17-19 July 2017 .International centre for heat and mass transfer.American society of thermal and fluids engineers