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Plane jets impinging on porous walls

Plane jets impinging on porous walls
Plane jets impinging on porous walls
The flow of a two-dimensional plane turbulent jet impinging on a porous screen has been studied experimentally. It is shown how the overall flow structure depends on the porosity of the surface. For low screen porosity (# < 0.41, say), transverse wall jets can be formed on both sides of the screen and in extreme cases the axial momentum flux some way downstream of the screen falls to zero, so that the screen has the same drag as would a solid wall. For high screen porosity (# > 0.57, say) the axial volume flux is largely preserved through the screen, but the dominant eddy structures present in the upstream jet are largely destroyed, so that entrainment rates downstream of the screen can be very low. The relatively small, intermediate range of porosities (0.41 < # < 0.57, where # is the screen open area ratio) is associated with dramatic changes in flow pattern and recirculating regions can exist on the upstream side of the screen. These flows, although all geometrically very simple, provide a serious challenge for computational modelling.
0723-4864
16-26
Cant, Ross
65ca18ba-5381-4204-9495-f113a992b3df
Castro, Ian
66e6330d-d93a-439a-a69b-e061e660de61
Walklate, Peter
ef9b8322-3614-4b7f-93c2-49b8c2392c84
Cant, Ross
65ca18ba-5381-4204-9495-f113a992b3df
Castro, Ian
66e6330d-d93a-439a-a69b-e061e660de61
Walklate, Peter
ef9b8322-3614-4b7f-93c2-49b8c2392c84

Cant, Ross, Castro, Ian and Walklate, Peter (2002) Plane jets impinging on porous walls. Experiments in Fluids, 32 (1), 16-26. (doi:10.1007/s003480200002).

Record type: Article

Abstract

The flow of a two-dimensional plane turbulent jet impinging on a porous screen has been studied experimentally. It is shown how the overall flow structure depends on the porosity of the surface. For low screen porosity (# < 0.41, say), transverse wall jets can be formed on both sides of the screen and in extreme cases the axial momentum flux some way downstream of the screen falls to zero, so that the screen has the same drag as would a solid wall. For high screen porosity (# > 0.57, say) the axial volume flux is largely preserved through the screen, but the dominant eddy structures present in the upstream jet are largely destroyed, so that entrainment rates downstream of the screen can be very low. The relatively small, intermediate range of porosities (0.41 < # < 0.57, where # is the screen open area ratio) is associated with dramatic changes in flow pattern and recirculating regions can exist on the upstream side of the screen. These flows, although all geometrically very simple, provide a serious challenge for computational modelling.

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Published date: 2002

Identifiers

Local EPrints ID: 22190
URI: http://eprints.soton.ac.uk/id/eprint/22190
ISSN: 0723-4864
PURE UUID: faa35770-6685-4013-8dab-14b703ad138e

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Date deposited: 22 Mar 2006
Last modified: 25 Nov 2019 19:29

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Contributors

Author: Ross Cant
Author: Ian Castro
Author: Peter Walklate

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