Surface flow visualization using the thermal wakes of small heated spots

被引:9
作者
Batchelder, KA [1 ]
Moffat, RJ [1 ]
机构
[1] Stanford Univ, Dept Mech Engn, Stanford, CA 94305 USA
关键词
Vortex; Heat Transfer; Boundary Layer; Heat Transfer Coefficient; Flow Direction;
D O I
10.1007/s003480050213
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
This note describes a surface flow visualization technique which uses the thermal wakes of an array of small heated spots to infer the local flow direction. The thermal wake is made visible using wide band thermochromic Liquid crystals. The technique is illustrated using the endwall flow under a horseshoe vortex at the base of a right circular cylinder in a turbulent boundary layer. Comparisons to results generated using the oil of wintergreen technique were in good agreement. In addition to surface flow direction, the technique has the potential to be used to measure the heat transfer coefficient at each spot. Data are presented in terms of photographs of the actual visualization surface. The techniques is suitable for low speed flows.
引用
收藏
页码:104 / 107
页数:4
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