Imperial College London
Portrait Picture

Professor Maarten van Reeuwijk

Faculty of Engineering, Department of Civil and Environmental Engineering

Professor of Urban Fluid Mechanics
 
 
 
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Contact

 

+44 (0)20 7594 6059m.vanreeuwijk Website CV

 
 
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Assistant

 

Miss Rebecca Naessens +44 (0)20 7594 5990

 
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Location

 

331Skempton BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Vouriot:2023:10.1017/flo.2023.11,
author = {Vouriot, CVM and Higton, TD and Linden, PF and Hughes, GO and van, Reeuwijk M and Burridge, H},
doi = {10.1017/flo.2023.11},
journal = {Flow: Applications of Fluid Mechanics},
pages = {1--18},
title = {Uniformly distributed floor sources of buoyancy can give rise to significant spatial inhomogeneities within rooms},
url = {http://dx.doi.org/10.1017/flo.2023.11},
volume = {3},
year = {2023}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Displacement ventilation, where cool external air enters a room through low-level vents and warmer airleaves through high-level vents, is characterised by vertical gradients in pressure arising from the warmerindoor temperatures. Models usually assume that horizontal variations of temperature difference are smallin comparison and are, therefore, unimportant. Small-scale laboratory experiments and computational fluiddynamics were used to examine these flows, driven by a uniformly heated floor. These experiments andsimulations show that the horizontal variations of temperature difference can be neglected for predictions of the bulk ventilation rate; however, they also evidence that these horizontal variations can be significant andplay a critical role in establishing the pattern of flow within the room — this renders the horizontal position ofthe low- and high-level vents (relative to one another) important. We consider two cases: single-ended (whereinlet and outlet are at the same end of the room) and opposite-ended. In both cases the ventilation flow rateis the same. However, in the opposite-ended case a dead zone is established in the upper part of the roomwhich results in significant horizontal variations. We consider the formation of this dead zone by examiningthe streamline patterns and the age of air within the room. We discuss the implications for occupant exposureto pollutants and airborne disease.Impact Statement:Exposure to indoor air pollution and airborne diseases are major factors in human health and well being.Guidance on appropriate ventilation rates is typically based on bulk ventilation rates, either in terms of theamount supplied per individual or as air exchange rates for a space. Such bulk measures assume homogeneousconditions within a space while, in practice, there are often significant spatial variations in properties. Thispaper shows that in displacement ventilation, where it is commonly assumed that horizontal variations arenegligible
AU  - Vouriot,CVM
AU  - Higton,TD
AU  - Linden,PF
AU  - Hughes,GO
AU  - van,Reeuwijk M
AU  - Burridge,H
DO  - 10.1017/flo.2023.11
EP  - 18
PY  - 2023///
SN  - 2633-4259
SP  - 1
TI  - Uniformly distributed floor sources of buoyancy can give rise to significant spatial inhomogeneities within rooms
T2  - Flow: Applications of Fluid Mechanics
UR  - http://dx.doi.org/10.1017/flo.2023.11
UR  - https://www.cambridge.org/core/journals/flow/article/uniformly-distributed-floor-sources-of-buoyancy-can-give-rise-to-significant-spatial-inhomogeneities-within-rooms/BF3ADBE776163E0E722ABC4141FA9136
UR  - http://hdl.handle.net/10044/1/104478
VL  - 3
ER  -
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