Search Results:　 1-20 of 1025

HOSOKAWA Shigeo , MIZUMOTO Hiroki , TOMIYAMA Akio

… We therefore proposed a molecular tagging velocimetry based on photobleaching reaction (PB-MTV) and applied it to turbulent flows in a square duct to demonstrate the possibility of evaluation of TKE budget. … We measured TKE budget in a turbulent water flow in a square duct by using the PB-MTV at the same turbulent Reynolds number as DNS data provided by Horiuti, and compared the measured data with the DNS data to validate PB-MTV for evaluation of TKE budget. …

Journal of Fluid Science and Technology 7(1), 168-180, 2012

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MOTOZAWA Masaaki , KUROSAWA Taiki , OTSUKI Tomohiro , IWAMOTO Kaoru , ANDO Hirotomo , SENDA Tetsuya , KAWAGUCHI Yasuo

… Experimental investigation of the relationship between mass transfer and turbulent drag reduction of the drag-reducing channel flow with dosed polymer solution from a wall was carried out. … As a result, in the case of water flow, dosed dyed water was ejected from the wall and was well diffused by the strong turbulent eddy motion. … In contrast, when the polymer solution was dosed from the wall, the diffusion was largely suppressed in the near-wall region and drag reduction occurred. …

Journal of Thermal Science and Technology 7(1), 272-287, 2012

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KATOH Kenji , WAKIMOTO Tatsuro , 西村 貴志

… The efficiency index η, (i.e., the ratio between heat transfer enhancement and drag increase from a smooth channel), is discussed in a channel with a delta wing-type vortex generator (VG) installed on the wall in laminar and turbulent flow. … From the results of direct numerical simulation, η decreases slightly in the turbulent flow with Pr, while it increases noticeably in the laminar flow. …

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B 78(794), 1769-1783, 2012

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WATANABE Tomoaki , 酒井 康彦 , 長田 孝二 , 寺島 修

Joint statistics between streamwise velocity and concentration of reactive species in a planar liquid jet with a secondorder chemical reaction (A×B→R) are experimentally investigated. A water solution …

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B 78(788), 783-793, 2012

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TERASHIMA Osamu , 酒井 康彦 , NAGATA Kouji

… The characteristics of a two-dimensional turbulent jet in the flapping motion are investigated by simultaneously measuring the velocity and pressure. … In addition, the estimation of the turbulent energy budget shows that the turbulent energy production and its transportation from the inner region to the outer region of the jet by the diffusion are enhanced during the flapping motion. …

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B 78(787), 541-552, 2012

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KIMURA Motoaki , MIYAGI Norimasa

… The aim of this experimental study is to investigate the diffusion of jets, with particular attention focused on the relationship between the static pressure and the stream wise mean velocity on the development of a two-dimensional air jet. … As a result of the experiment, it was found that negative static pressure exists in the turbulent shear layer. … It is considered that the entrainment processes from the negative static pressure by the vortex structure motion of the turbulent shear layer. …

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B 77(784), 2442-2453, 2011

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TSUNODA Hiroyuki

… Simultaneous measurements on the velocity and concentration fields of matter in a turbulent round jet injected into a counter stream have been conducted by using a combined system of PIV and PLIF techniques. … Axial profiles of the concentration statistics along the jet centerline showed that both rms concentration fluctuation and streamwise turbulent flux of mass have two peaks in the near field of the jet and in the mean stagnant region. …

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B 77(775), 529-536, 2011

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SAKAI Yasuhiko , NAGATA Kouji , KUBO Takashi , ICHINO Shuhei , HORIUCHI Kenji

… Simultaneous measurements of instantaneous two-component velocities and concentration are conducted in an axisymmetric CO2 turbulent jet diffusion field. … The second is the 'Chassaing type' X hot-wire probe, which is insensitive to local concentration, for measurement of instantaneous two-component velocities in the CO2 diffusion field. …

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B 77(775), 486-495, 2011

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