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On the natural displacement flow through a full-scale enclosure, and the importance of the radiative participation of the water vapour content of the ambient air

Lookup NU author(s): Stephen Howell, Dr Ian Potts

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Abstract

This paper presents experimental data for the temperature stratification established within a full-scale enclosure, for the natural displacement ventilation flow driven by a source of bouyancy at floor level within the space with air as the working fluid. A range of predictive techniques is also investigated for the flow, and for each technique a critical comparison with the experimental data is presented. It is confirmed that the salt-bath modelling technique and related mathematical model of Linden et al. (J. Fluid Mech. 212 (1990) 309) is not appropriate for the prediction of this type of ventilation flow in full-scale buildings. Computational fluid dynamics is a powerful techniques that can yield realistic predictions for this type of ventilation flow. Even this approach, however, requires further investigation before it can be used routinely. In particular, this paper illustrates the effect of applying different models of turbulence, and highlights the requirement to employ a complete thermal radiation model when using the CFD technique to predict this class of flow. © 2002 Published by Elsevier Science Ltd.

Publication metadata

Author(s): Howell SA, Potts I

Publication type: Article

Publication status: Published

Journal: Building and Environment

Year: 2002

Volume: 37

Issue: 8-9

Pages: 817-823

ISSN (print): 0360-1323

ISSN (electronic): 1873-684X

Publisher: Pergamon

URL: http://dx.doi.org/10.1016/S0360-1323(02)00048-3

DOI: 10.1016/S0360-1323(02)00048-3

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