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Direct Numerical Simulation of turbulent Non-Newtonain flow in a rod-roughened channel

DOI: 10.1615/THMT-18.1000
pages 923-925

H. R. Anbarlooei
Mechanical Engineering Program (PEM/COPPE), Universidade Federal do Rio de Janeiro, C.P. 68503, 21941-972, Rio de Janeiro, Brazil

S. Parvar
CEFT, Departamento de Engenharia Mecanica, Faculdade de Engenharia da Universidade do Porto, Rua Dr. Roberto Frias, s / n 4200-465 Porto PORTUGAL

D. O. A. Cruz
Mechanical Engineering Department, Federal University of Rio de Janeiro, Av. Moniz de Aragao 420, 21945-972 Rio de Janeiro, Brazil

Fernando T. Pinho
CEFT, Department of Mechanical Engineering, Faculty of Engineering University of Porto, 4200-465, Porto, Portugal

Abstrakt

Direct numerical simulation are performed for fully-developed flow of power law fluids in a planar channel with rod-roughened walls. Validation is initially performed by investigation the case of Newtonian flow (power index of 1) and comparing with literature data. The results showed that the velocity profile in wall coordinates has a negative shift (to lower values of u+) consistent with the increased drag even for the shear-thinning fluids. However, the overall log law is higher than the Newtonian case because of shear thinning effect.

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