Authors: E.P. Bandarra Filho, G.A. Oliveira
Affilation: Federal University Of Uberlandia, Brazil
Pages: 381 - 384
Keywords: nanofluids, thermal conductivity, nanoparticle, heat exchanger
Nanofluids are fluid formed by dispersing solid particles of size ranging 1-100 nm (nanoparticles) in a given base fluid such as water or oil, for example. Regarding to the thermal potential, the researches on nanofluids increased significantly in the last years. In this paper, silver/water nanofluids were produced in different concentrations, between 0.1 e 0.3 %, and different sizes, 10 and 80 nm. The thermal conductivity for concentration of 0.3% was 18% higher than the distilled water, used as base fluid. An experimental bench was built to test heat exchangers using pure fluids or nanofluids. The centrifugal fan can supply face velocity up to 25 m/s. The air temperature is regulated through a PID controller using electrical resistors. In these tests, the inlet air temperature was fixed around 35oC. The ducts are insulated to better control of the temperature during the tests, two differential transducers were installed to measure the pressure drop in the nozzles and by the heat exchanger. The hot fluid circuit has a pump, mass flow meter, thermal bath and PT-100. The full paper will contain the thermal/hydraulic performance of silver/water nanofluids flowing inside the heat exchanger in comparison with results obtained for distilled water.