Unsteady natural ventilation at model scale—Flow reversal and discharge coefficients of a short stack and an orifice

Measurements of unsteady flow rates and pressures have been made on a scale model of a building fitted with two openings—a short stack and a sharp-edged orifice. The flow reversal characteristic of the stack is found to be different to that of a longer stack tested in an earlier study. The short sta...

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Bibliographic Details
Published in:Building and environment 2008-09, Vol.43 (9), p.1491-1506
Main Authors: Costola, D., Etheridge, D.W.
Format: Article
Language:English
Subjects:
Applied sciences
Building technical equipments
Buildings
Buildings. Public works
Chimney
Chimneys
Computation methods. Tables. Charts
Discharge coefficient
Discharge coefficients
Environmental engineering
Exact sciences and technology
Flow rates
Flow reversal
Inertia
Natural ventilation
Q1
Scale models
Space heating
Stack
Structural analysis. Stresses
Unsteady flow
Ventilation
Ventilation. Air conditioning
Wind tunnel
Wind tunnels
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Summary:Measurements of unsteady flow rates and pressures have been made on a scale model of a building fitted with two openings—a short stack and a sharp-edged orifice. The flow reversal characteristic of the stack is found to be different to that of a longer stack tested in an earlier study. The short stack displays a greater propensity to reversal, which is consistent with its lower inertia. The time-averaged discharge coefficients of both the stack and the orifice have been examined to determine the effects of external flow. It is found that the effects are similar to those observed in an earlier study that used a different experimental approach.
ISSN:0360-1323
1873-684X
DOI:10.1016/j.buildenv.2007.08.005