Abstract
The present paper deals with experimental investigation using micron-sized distributed surface geometry on a flat plate in order to observe effective drag reduction. Namely, the objective is to verify Tani's hypothesis that distributed rough surface can even reduce turbulent drag in a certain Reynolds number range. So, we directly measured the net drag of a flat plate wrapped by a sheet with microsized distributed rough surface geometry. Obtained data showed that a limited amount of drag reduction is observed in the case of certain kinds of surface geometries. This result requires a new explanation of how the turbulent energy is suppressed in the turbulent boundary layer, since existing turbulent drag reduction mechanisms for a riblet surface is always explained together with streamwise groove structure. Therefore, by analyzing the obtained results, a more appropriate energy production mechanism in the turbulent boundary layer might be found out. The present experiment is the first step in a series of investigations concerning the above title.
| Original language | English |
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| Pages (from-to) | 1754-1761 |
| Number of pages | 8 |
| Journal | Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B |
| Volume | 62 |
| Issue number | 597 |
| Publication status | Published - 1996 May |
ASJC Scopus subject areas
- Mechanical Engineering