SKIN FRICTION FACTOR AND MEAN VELOCITY PROFILE MEASURED IN HIGH-REYNOLDS-NUMBER TURBULENT PIPE FLOW etc15 Tracking Number 149Presentation: Session: Wall-bounded flows 5 Room: Room B Session start: 15:00 Thu 27 Aug 2015 Noriyuki Furuichi furuichi.noriyuki@aist.go.jp Affifliation: AIST,NMIJ Yoshiya Terao terao.yoshiya@aist.go.jp Affifliation: AIST,NMIJ Yuki Wada wada-yuki11@ees.nagoya-u.ac.jp Affifliation: Nagoya Univ. Yoshiyuki Tsuji c42406a@cc.nagoya-u.ac.jp Affifliation: Nagoya Univ. Topics: - Wall bounded flows Abstract: A friction factor in a fully developed pipe flow is measured very accurately over wide range Reynolds number from 10^3 to 10^7 at the high Reynolds number facility in AIST,NMIJ. Also a velocity profile is measured by using a LDV up to 10^6. From the comparison between a velocity profile and the friction factor, we found that a log-law profile is well observed and Kármán constant is estimated to be 0.385. Based on the measurements, we present a new functional form of the friction factor which is consistent with mean velocity profile. |