Experimental Study of the Diffusion of a Confined Wall Jet through a Perforated Plate: Influence of the Porosity and the Geometry
Open Access
- 1 January 2022
- journal article
- research article
- Published by Scientific Research Publishing, Inc. in Open Journal of Fluid Dynamics
- Vol. 12 (01), 96-126
- https://doi.org/10.4236/ojfd.2022.121006
Abstract
This paper investigated lateral diffusion of a confined two-dimensional wall jet (air inlet height: 5 cm) through a perforated plate. We considered two plates with porosities of and . The plates were positioned at distances of 10 cm and 20 cm below the jet inlet. The experiments were realized using 2D Laser Doppler Anemometer (LDA). Different profiles of mean and fluctuating velocities are presented. The presence of a perforated plate strongly modified the airflow pattern compared to an empty enclosure. The velocities above and below the plate depend on several parameters, including the porosity and the plate’s position relative to the inlet slot and the longitudinal position. The difference between the flow velocity above and below the plates could not be related using a universal formula that depends on these parameters. We also investigated the influence of a porous media of a height of 20 cm (a stack of spheres having a diameter of 3.75 cm) located below the perforated plate. The results highlight that the porous medium strengthens the effects of the perforated plate on the flow.Keywords
This publication has 39 references indexed in Scilit:
- Airflow characteristics within a slot-ventilated enclosureInternational Journal of Heat and Fluid Flow, 2005
- Turbulent flow in a channel occupied by a porous layer considering the stress jump at the interfaceInternational Journal of Heat and Mass Transfer, 2003
- Boundary layer over a slotted plateEuropean Journal of Mechanics - B/Fluids, 1998
- Momentum transfer at the boundary between a porous medium and a homogeneous fluid—II. Comparison with experimentInternational Journal of Heat and Mass Transfer, 1995
- Momentum transfer at the boundary between a porous medium and a homogeneous fluid—I. Theoretical developmentInternational Journal of Heat and Mass Transfer, 1995
- Slip and no-slip velocity boundary conditions at interface of porous, plain mediaInternational Journal of Heat and Mass Transfer, 1992
- Analysis of the Brinkman equation as a model for flow in porous mediaPhysics of Fluids, 1987
- Boundary and inertia effects on convective mass transfer in porous mediaInternational Journal of Heat and Mass Transfer, 1982
- On the penetration of turbulence through perforated flat platesInternational Journal of Heat and Mass Transfer, 1980
- A study of transpiration from porous flat plates simulating plant leavesInternational Journal of Heat and Mass Transfer, 1979