Direct total skin-friction measurement of a flat plate in zero-pressure-gradient boundary layers

Autor:	Masaharu Matsubara, Tadashi Kasiwagi, Shinsuke Mochizuki, Kiyoto Mori, Masaru Inada, Hiroki Imanishi, Yoshiyuki Tsuji, Tomohiro Hattori
Rok vydání:	2009
Předmět:	Fluid Flow and Transfer Processes Drag coefficient Materials science business.industry Turbulence Mechanical Engineering General Physics and Astronomy Reynolds number Mechanics Drag equation symbols.namesake Optics Drag Parasitic drag symbols Aerodynamic drag business Pressure gradient
Zdroj:	Fluid Dynamics Research. 41:021406
ISSN:	1873-7005 0169-5983
Popis:	The total skin friction on a flat plate is directly measured by using a towing tank up to Reynolds number ReL 107 (or Rθ 104). Plates of 3.3 and 4.3 m in length are towed in still water, balancing the vertical weight by small flotation devices, and their drag force is measured by a highly sensitive load cell. We have developed a new technique to correct wave-making resistance, pressure resistance and drag on a turbulence simulator. When the measured total drag is converted into local drag, it is found that the local frictional resistance is about 6% smaller than that given by the Karman–Schoenherr formula. But it is consistent with the values obtained by the floating element technique, oil film interferometry and asymptotic evaluations.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::20dcf66fb011f582875cd13d1ae3a500 https://doi.org/10.1088/0169-5983/41/2/021406 Zobrazit plný text záznamu