AN EXPERIMENTAL STUDY OF MASS TRANSFER FROM FLUTTERING FLAGS
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説明
Mass transfer from a whole flag with free trailing edge fluttering vigorously with large amplitude in vertical wind and from parts of flags fluttering with arc-shapes between fixed leading edges and nodes was experimentally investigated in the ranges of the Reynolds number Re = 3 × 10 4 -4. 5 × 10 4 and 1 × 10 4 -5 X 10 4 , respectively. The arc-shape fluttering causes an increase in the Sherwood number only by 15% whereas it has fluttering frequencies much larger than the vigorous fluttering with the free trailing edge, which causes a rapid increase in the Sherwood number with wind velocity up to 3.2 times what is measured for the flags being still in the wind. The abrupt 14-fold increase in the drag of flags due to fluttering and the smoke flow visualization presented by Taneda and the 2-6-fold increase in heat transfer from a flat surface due to flow separation and reattachment measured by Ota and Kon strongly indicate that flow separation and reattachment occur on the vigorously fluttering flag to cause the 3.2-fold increase in the Sherwood number
収録刊行物
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- International Communications in Heat and Mass Transfer
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International Communications in Heat and Mass Transfer 30 185-196, 2003-03-01
Elsevier BV