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Air water flows in building drainage systems
Journal article   Peer reviewed

Air water flows in building drainage systems

Simon Beecham and Terry Lucke
Urban Water Journal, Vol.12(6), pp.455-467
2015
DOI: https://doi.org/10.1080/1573062X.2013.820335
url
https://doi.org/10.1080/1573062X.2013.820335View
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Abstract

siphonic roof drainage air entrainment cavitation priming
This paper investigates the mechanisms of two-phase flows that occur in commercial and industrial roof drainage systems. Both traditional gravity-fed and siphonic roof drainage systems are examined. Air entrainment plays a fundamental role in the performance of siphonic roof drainage systems. In particular, air entrainment has a significant effect on: • maximum system flowrate capacity; • pipe friction losses; • operational system pressures; • operational gutter water depths; and • ability of the system to prime. However, experimental results presented here demonstrate that the reduction in system capacity is not directly proportional to the increase in air content. One possible explanation for this is that water and air will be affected differently by sub-atmospheric pressures. The effect air entrainment has on roof drainage performance is investigated. The ways in which air is introduced into the system are identified and the effects of different air/water ratios are quantified. Finally methods for reducing air entrainment are described.

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Water Resources
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