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SUMMARY:Strong Acoustic Streaming in High-Intensity Discharge Lamps - Greg
  Chini\, University of New Hampshire
DTSTART:20151015T103000Z
DTEND:20151015T113000Z
UID:TALK60907@talks.cam.ac.uk
CONTACT:Catherine Pearson
DESCRIPTION:High-intensity discharge (HID) lamps are one type of arc disch
 arge lamp. They are routinely used to illuminate stadiums\, warehouses\, r
 oadways\, greenhouses and other venues requiring a large amount of light f
 rom a compact source. Although HID lamps are comparably efficient -- rough
 ly 25% of the electrical energy delivered to these lamps is converted to u
 seful light -- further increases in efficiency are limited by buoyancy-dri
 ven flows of the hot gas comprising the arc. Researchers have shown that t
 hese undesirable flows can be effectively countered by acoustic streaming 
 flows: time-mean flows induced by time-periodic standing acoustic waves\, 
 the latter being excited by modulating the lamp current at an acoustic eig
 enfrequency. Interestingly\, neither the very large magnitude nor the orie
 ntation of acoustic streaming flows arising in HID lamps can be explained 
 by classical streaming theories. In this talk\, a new theory will be descr
 ibed that properly accounts for both these features. A computationally-eff
 icient strategy for modeling the thermo-fluid mechanics of acoustically-st
 abilized HID lamps will also be discussed.\n
LOCATION:Open Plan Area\, BP Institute\, Madingley Rise CB3 0EZ
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