The work reported in this paper shows experimental results from a study on a new type of heat transfer fluid, nanofluids, using diathermic oil as base fluid. These kinds of heat transfer fluids find application in those areas of heat transfer where high efficiency, compact volumes and high energy fluxes are required. In literature there are not many experimental data on diathermic oil based nanofluids because many experimental campaigns are focused on water nanofluids. On the other hand diathermic oil nanofluids are very important in those applications where high temperatures are reached or where the use of water is not suitable. Samples of nanofluids, with nanoparticles of CuO, Al2O3, ZnO and Cu, having different shapes and concentrations varying from 0.0% up to 3.0%, have been produced and their thermal conductivity has been measured by means of hot-wire technique, according to the standard ASTM D 2717-95. Measurements were carried out to investigate the effects of volume fraction, particle size of nanoparticles and thermal conductivity of base fluid. The effect of temperature has been also investigated in the range 20°C - 60°C. A dependence was observed on the measured parameters and the results showed that the heat transfer performance of diathermic oil enhances more than water with the same nanoparticles.
Experimental Tests on Diathermic Oil Based Nanofluids for HeatTransfer Applications
COLANGELO, Gianpiero;FAVALE, ERNANI;DE RISI, Arturo;LAFORGIA, Domenico
2011-01-01
Abstract
The work reported in this paper shows experimental results from a study on a new type of heat transfer fluid, nanofluids, using diathermic oil as base fluid. These kinds of heat transfer fluids find application in those areas of heat transfer where high efficiency, compact volumes and high energy fluxes are required. In literature there are not many experimental data on diathermic oil based nanofluids because many experimental campaigns are focused on water nanofluids. On the other hand diathermic oil nanofluids are very important in those applications where high temperatures are reached or where the use of water is not suitable. Samples of nanofluids, with nanoparticles of CuO, Al2O3, ZnO and Cu, having different shapes and concentrations varying from 0.0% up to 3.0%, have been produced and their thermal conductivity has been measured by means of hot-wire technique, according to the standard ASTM D 2717-95. Measurements were carried out to investigate the effects of volume fraction, particle size of nanoparticles and thermal conductivity of base fluid. The effect of temperature has been also investigated in the range 20°C - 60°C. A dependence was observed on the measured parameters and the results showed that the heat transfer performance of diathermic oil enhances more than water with the same nanoparticles.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
