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NUMERICAL INVESTIGATION ON FORCED CONVECTION IN TRIANGULAR CROSS SECTION MICROCHANNELS WITH NANOFLUIDS

DOI: 10.1615/ICHMT.2015.IntSympAdvComputHeatTransf.1180
pages 1251-1268

Bernardo Buonomo
Dipartimento di Ingegneria Industriale e dell'Informazione, Università degli Studi della Campania "Luigi Vanvitelli," Aversa (CE), Italy

Oronzio Manca
Dipartimento di Ingegneria Industriale e dell'Informazione, Università degli Studi della Campania "Luigi Vanvitelli," Aversa (CE), Italy

Sergio Nardini
Dipartimento di Ingegneria Industriale e dell'Informazione, Università degli Studi della Campania "Luigi Vanvitelli", Via Roma 29, Aversa (CE), Italy

Salvatore Tamburrino
Dipartimento di Ingegneria Industriale e dell'Informazione, Seconda Universita di Napoli, Aversa, Italy; ENEA C.R. Bologna, Via Martiri di Monte Sole 4, 40129 Bologna, Italy

Аннотация

In this paper a numerical investigation on laminar forced convection flow of a water−Al2O3 nanofluid in a triangular microchannel is accomplished. A constant and uniform heat flux on one of the external surfaces has been applied and a single-phase model approach has been employed. The analysis has been performed in steady state regime for particle size in nanofluids equal to 38 nm.
The CFD commercial code Ansys-Fluent has been employed in order to solve the 3-D numerical model. The geometrical configuration under consideration consists in a duct with a triangular shaped crossing area. Results are presented in terms of average wall temperatures, heat transfer convective coefficient, average Nusselt number and required pumping power profiles. Comparison with results related to the fluid dynamic and thermal behaviours are carried out in order to evaluate the enhancement due to the presence of nanoparticles in terms of volumetric concentration. The results have shown the increase of the convective heat transfer coefficients, in particular, for high concentration of nanoparticles and for increasing values of Reynolds number but this is accompanied by a growth of the wall shear stress and the required pumping power. It seems that is not convenient the use nanofluids instead of pure water for volume concentrations higher than 0.5%.

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