The historical development of research in drainage-waste-ventilation (DWV) systems has included extensive research into hydraulic and pneumatic conditions in associated pipework. The results were interpreted as suggesting that stack discharge falls as an annulus that entrains an air flow with an associated pressure drop, although there was evidence suggesting that a significant proportion of the water was found in the air core. A new model is proposed in this paper that suggests that the air flow entrainment is shared between the water annulus and the water falling in the air core. This model is consistent with previous and current work, and offers scope for further development, in areas such as inclusion of the effects of detergents on DWV system conditions.
|Number of pages||6|
|Journal||Building Services Engineering Research and Technology|
|Publication status||Published - 1999|