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하태웅(Tae Woong Ha),주영찬(Young Chan Ju),이용복(Yong-Bok Lee),김창호(Chang-Ho Kim) 한국유체기계학회 2002 유체기계 연구개발 발표회 논문집 Vol.- No.-
For measuring friction-factor of artificially-roughened surfaces which are usually applied on damper seals, flat plate test apparatus is designed and fabricated. the measurement of leakage and pressure distribution through round-hole pattern specimen with different hole area is described and a method is discussed for determining the friction-factor experimentally. Results show that the friction-factor of the round-hole pattern surfaces is bigger than that of smooth surface and increases as increasing the hole area. A empirical friction factor model for round-hole pattern surface is defined as the Moody's friction factor formula.