Ra. Stafford et al., FLOW VISUALIZATION AND INSTANTANEOUS VELOCITY-MEASUREMENTS OF SPRAY DRYER GAS AND SPRAY FLOWS USING PARTICLE IMAGE VELOCIMETRY, Drying technology, 15(6-8), 1997, pp. 1661-1671
The technique of particle image velocimetry has been used to produce g
ood quality instantaneous velocity maps of the gas and spray phases wi
thin a pilot plant co-current spray dryer. Good quality now visualisat
ion data provided by the use of the laser sheet as an intense source o
f illumination has indicated that the air and spray flows were charact
erised by an offset central jet with down flowing (right hand side) an
d up flowing (left hand side) wall streams. This is significantly diff
erent from what would normally be expected and it was suggested that t
his was possibly due to a maldistribution of the air phase on inlet to
the dryer.