Hydrodynamic Entry Length for Laminar Flow Between Parallel Porous Plates

Numerical simulation of laminar flow development with heat and mass transfer in PEM fuel cell flow channels having oxygen and hydrogen suction at one channel wall

“…The present numerical results are in good agreement with the established results in literature [15,23,27] as shown in Figures 3-5.…”

“…They solved the continuity and axial momentum equations using finite-difference technique and gave two correlations for the hydrodynamic entry length with injection and suction, respectively. They have also simulated the thermal entry problem for laminar flow between parallel porous plates assuming constant properties with constant and equal wall temperatures [16]. Doughty and Perkins have also simulated the thermal and combined entry problem for laminar flow with constant properties between parallel porous plates for uniform suction and injection at constant and equal heat fluxes [17].…”

“…The first approach uses theoretical techniques to investigate the variation of flow structure including the fuel concentration as well as the current generated along the channel [11][12][13][14], but the analytical solutions are only available in limited cases whenever some simplifications are feasible due to strongly nonlinear nature of the governing equations. The second approach uses CFD to examine the two-or three-dimensional flow field in the flow channels [15][16][17][18][19][20][21][22]. Doughty and Perkins [15] have investigated the hydrodynamic entry length for laminar flow between parallel porous plates for a variety of cases such as uniform suction or injection (blowing) with uniform or parabolic entry velocity profiles and constant or variable properties.…”

“…The second approach uses CFD to examine the two-or three-dimensional flow field in the flow channels [15][16][17][18][19][20][21][22]. Doughty and Perkins [15] have investigated the hydrodynamic entry length for laminar flow between parallel porous plates for a variety of cases such as uniform suction or injection (blowing) with uniform or parabolic entry velocity profiles and constant or variable properties. They solved the continuity and axial momentum equations using finite-difference technique and gave two correlations for the hydrodynamic entry length with injection and suction, respectively.…”

The Influence of the Hydrodynamic Conditions on the Performance of Membrane Distillation

“…The distance from the channel inlet to the point of the stabilization of laminar velocity profile is defined as the hydrodynamic entrance length (marked as "L H ") (Andersson & Irgens, 1990;Chu-Lien et al, 2010;Doughty & Perkins, 1970;Zhang et al, 2010). Different correlations for the calculation of the Nusselt number are presented in literature for entrance and fully developed flow regions (Gryta et al, 1997(Gryta et al, , 1998.…”