OBSERVATIONS OF FLOW PATTERNS IN A SPRAY DRYER
作者:
D.B. Southwell,
T.A.G. Langrish,
期刊:
Drying Technology
(Taylor Available online 2000)
卷期:
Volume 18,
issue 3
页码: 661-685
ISSN:0737-3937
年代: 2000
DOI:10.1080/07373930008917731
出版商: Taylor & Francis Group
关键词: spray drying;flow visualisation
数据来源: Taylor
摘要:
Experiments have been performed on a pilot scale, cylinder-on-cone spray dryer fitted with a vaned-wheel atomiser to observe air flow patterns, with and without water spray. A combination of tufts, smoke streams and a laser light sheet, was used to provide information about regions of recirculation, flow stability, spray trajectories and wall deposition. While atomiser-induced swirl dominated the flow patterns under typical operating conditions, some instability was observed, although different in type, for situations with and without atomiser rotation. Clockwise eddies were observed to form and collapse between the wall and the strongly anti-clockwise swirling core created by anti-clockwise atomiser rotation. Without swirl, large portions of the recirculation zones at the walls were observed to have a weak tendency to change randomly between clockwise, anticlockwise and chaotic behaviour.
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