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SUMMARY:Transient Flows and Stratification of a Naturally Ventilated Enclo
 sure Containing Both a Localised and Distributed Source of Buoyancy - Jami
 e Partridge\, DAMTP
DTSTART:20140228T130000Z
DTEND:20140228T140000Z
UID:TALK46957@talks.cam.ac.uk
CONTACT:Dr Henry Burridge
DESCRIPTION:Simple models of ventilation flows allow designers to anticipa
 te the performance of buildings readily without the cost of heavy computat
 ion. Such a model is detailed here to examine the transient flows and stra
 tification in a naturally ventilated enclosure containing both a localised
  and distributed source of buoyancy. Both sources of buoyancy are located 
 at the base of the enclosure to represent a building where there is a dist
 ributed heat flux from the floor\, for example from a sun patch\, which ha
 s to compete with localised heat sources within the space. To investigate 
 this problem\, small-scale experiments were conducted and compared to both
  a `perfect-mixing' and 'zero-mixing' model of the transients.\n\nProvidin
 g the ratio of distributed to localised buoyancy flux $\\Psi$ isn't too la
 rge\, a stable two-layer stratification is reached in steady state. How th
 e stratification evolves in time\, in particular how long it takes to reac
 h steady state\, is key to understanding what can be expected in real buil
 dings. The transient evolution of the interior stratification is reported 
 here and compared to the theoretical model.  
LOCATION:CUEd
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