Bubble characteristics and trajectories in a microbubble boundary layer
作者:
S. Pal,
C. L. Merkle,
S. Deutsch,
期刊:
Physics of Fluids(00319171)
(AIP Available online 1988)
卷期:
Volume 31,
issue 4
页码: 744-751
ISSN:0031-9171
年代: 1988
DOI:10.1063/1.866810
出版商: AIP
数据来源: AIP
摘要:
Optical and photographic surveys of microbubble boundary layers are presented. The results show that the outer edge of the bubble cloud diffuses away from the wall as the bubbles are swept downstream. The plate‐on‐bottom orientation contains a bubble‐free region near the wall that cannot be discerned for the plate‐on‐top configuration. Skin friction measurements made when the bubble‐free region extends toy+=200 show there is no longer anyCfreduction present suggesting bubbles are not effective when they are outside the near‐wall region of the boundary layer. Bubble sizes, which increase with airflow and distance from the injection section and decrease with free‐stream velocity, were measured to be between 150 and 1100 &mgr;m.
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