Turbulent particle loss augmentation in a ventilation duct

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)213-218
Journal / PublicationBuilding Services Engineering Research and Technology
Volume19
Issue number4
Publication statusPublished - 1998
Externally publishedYes

Abstract

Particle loss augmentation in turbulent flow was studied experimentally. Experiments were performed in a 150 mm square ventilation duct. Small tracer particles of size ranging from 0.7-7.1 μm were used to study deposition enhancement with streamwise-periodic disturbances mounted on one of the principal walls, under turbulent flow. A new and highly sensitive analytical technique was adopted to determine the spatial mass flux along the ribbed duct. On some surfaces, particle deposition enhancement as much as seven times higher than on smooth surfaces was observed. Periodic averages of mass transfer coefficients for different particle sizes were evaluated. The friction factor was approximately three times the smooth duct value. Efficiency indexes, based on equal fan power, were determined for all particle sizes.