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Authors
Advisor(s)
Abstract(s)
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.
Description
Keywords
Laminar flow Newtonain Irreversible loss coefficient Axisymmetric diffusers Numerical
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
Publisher
Elsevier