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Title: Pressure drop coefficient of laminar Newtonian flow in axisymmetric diffusers
Authors: Rosa, Sérgio
Pinho, Fernando
Keywords: Laminar flow
Irreversible loss coefficient
Axisymmetric diffusers
Issue Date: 2006
Publisher: Elsevier
Citation: Rosa, Sérgio; Pinho, Fernando (2006) - Pressure drop coefficient of laminar Newtonian flow in axisymmetric diffusers. International Journal of Heat and Fluid Flow. ISSN 0142-727X. 27:2, p. 319-328
Abstract: The laminar flow of Newtonian fluids in axisymmetric diffusers has been numerically investigated to evaluate the pressure-loss coefficient as a function of Reynolds number, diffusion angle and expansion ratio. The numerical simulations were carried out with a finitevolume based code using non-orthogonal collocated grids and second order accurate differencing schemes to discretize all terms of the transport equations. The calculations were carried out for Reynolds numbers between 2 and 200, diffusion angles from 0 to 90 and expansion ratios of 1.5 and 2 and the data are presented in tabular form and as correlations. A simplified 1D theoretical analysis helped explain the various contributions to the loss coefficient and its difference relative to the reversible pressure variation due to differences between the actual and fully developed friction losses, distortions of the velocity profiles and pressure non-uniformity upstream and downstream of the expansion section.
ISSN: 0142-727X
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Appears in Collections:DMA - Artigos em Revistas Indexados ao ISI/Scopus

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