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Plane Stratified Flow in a Room Ventilated by Displacement Ventilation

Nielsen P. V., Nickel J., Baron D. J. G., 2004
air flow | diffusion | displacement ventilation
Bibliographic info: RoomVent 2004, 9th international conference in University of Coimbra - Portugal, 5-8th september 2004, pp 6, 9 Fig., 6 Ref.
Languages: English

The air movement in the occupied zone of a room ventilated by displacement ventilation exists as a stratified flow along the floor. This flow can be radial or plane according to the number of wall-mounted diffusers and the room geometry. This paper addresses the situations where plane flow is obtained and a semianalytic expression for the velocity level in the occupied zone is given. It is shown that the flow has a constant velocity level independent of the distance from the diffuser and that the thickness or length scale of the stratified flow has a tendency to be constant everywhere in the flow. The thickness and the velocity are functions of the Archimedes number.


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