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Study of high Reynolds number pipe flows with porous inserts
Pereira, José Carlos F.; Malico, Isabel; Hayashi, Thamy C.; Raposo, Jorge M. F.This paper reports experiments and calculations for the flow at the inlet and exit of a ceramic foam located in a straight pipe and in a pipe with a 1:4 sudden expansion. For the latter, the foam, with thickness to diameter ratio between 0.15 and 0.60, was located at different distances from the sudden expansion wall. Three different pore sizes (10, 20 and 60 ppi) were investigated for pore Reynolds numbers in ...
Analysis of the flow at the interface of a porous media
Hayashi, Thamy; Malico, Isabel; Pereira, José CarlosThe influence of inserting a ceramic foam in a pipe with a 1:4 sudden expansion was numerical investigated. The foam, with a thickness to diameter ratio of 0.60, was positioned at different distances from the sudden pipe expansion wall. Three different porosities were analyzed (10, 20 and 60 pores per inch) for pore Reynolds numbers in the range of 20-400, corresponding to pipe Reynolds numbers of 2400 to 22000...
Experimental and numerical characterization of the transverse dispersion at the...
Pereira, José Carlos F.; Malico, Isabel; Hayashi, Thamy C.; Raposo, Jorge M. F.The paper theoretically and numerically describes and experimentally studies transverse dispersion of a passive tracer in highly porous ceramic foams of different pore sizes. The pore Reynolds numbers range from 10 to 300. Digital images of the dispersion patterns were recorded and an approximate transverse dispersion coefficient was determined. Numerical solutions of the steady fluid flow and scalar concentrat...
Pollutants formation in a low-emission porous burner
Hayashi, Thamy C.; Malico, Isabel; Pereira, José Carlos F.Combustion in inert porous burners has been focused in numerous research works which have demonstrated the advantages of this technique. In comparison with conventional burners, porous media combustors attain higher efficiencies over a large modulation range with reduced emission of pollutants. Additionally, these burners are compact and provide the possibility of burning leaner mixtures and fuels with lower he...
Determinação da condutividade térmica efectiva através da modelação tridimensio...
Hayashi, Thamy C.; Malico, Isabel; Pereira, José Carlos F.A simulação tridimensional de queimadores porosos é, muitas vezes, necessária devido às características tridimensionais dos fenómenos que ocorrem no seu interior. Contudo, o esforço computacional envolvido nessas simulações é elevado. Para se utilizar modelos de dimensão inferior é necessário dispor de modelos de fecho e propriedades efectivas que reflictam as características tridimensionais. Para o caso do que...
Three-dimensional modelling of a two-layer porous burner for household applicat...
Hayashi, Thamy C.; Malico, Isabel; Pereira, José Carlos F.A finite-volume calculation of the three-dimensional reacting flow in a porous burner is presented. The Navier-Stokes, energy and species transport equations are solved, and radiative heat transfer under local thermal non-equilibrium between the solid and gas phases is considered. Strong dissipation of the jets from the perforated plate is observed, contributing to the flame stabilization inside the ceramic foa...
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