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SUMMARY:The effectiveness of an air curtain in the doorway of a ventilated
  building - Daria Frank\, DAMTP
DTSTART:20140131T130000Z
DTEND:20140131T140000Z
UID:TALK49347@talks.cam.ac.uk
CONTACT:Dr Henry Burridge
DESCRIPTION:Air curtains are used to reduce the heat and the mass exchange
  between an indoor environment and the ambient. Their sealing ability is a
 ssessed in terms of the effectiveness E\, which describes by how much the 
 air curtain reduces the exchange flow compared to the open-door situation.
  Previous work studied the air curtain effectiveness when the doorway is t
 he only means of ventilating a space. In this talk we examine effects of a
 n additional displacement ventilation pathway on the effectiveness. The ma
 in controlling parameter is the deflection modulus D_{m} which is the rati
 o of the momentum flux of the air curtain and the transverse forces due to
  the displacement ventilation. For small values of D_{m} the air curtain i
 s drawn inside the space by the ventilation flow. For high values of D_{m}
  the flow is controlled by the air curtain. A smooth transition occurs bet
 ween these two regimes. Our model makes a quantitative and qualitative pre
 diction of the E(D_{m}) - curve. Laboratory experiments were conducted to 
 test the proposed model. The experimental data were compared to theoretica
 l predictions and good agreement was found.
LOCATION:LR3B\, Inglis Building\, CUED 
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