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Featured researches published by Shigetaka Fujita.
Experimental Thermal and Fluid Science | 1992
Shigetaka Fujita; Hideo Osaka
Abstract This paper documents an experimental study of the mean flow and turbulence characteristics for three-dimensional turbulent free jets of air issuing into still air surroundings from cruciform nozzles with four aspect ratio values (AR = 3,5,12.5, and 50). The measured quantities comprise streamwise, spanwise, and lateral mean velocities obtained with a Pitot-static pressure tube and a five-hole pressure tube, and the turbulent intensity with both an X-type hot-wire probe and a linearized constant-temperature anemometer. The experimental results reveal the “saddleback” shape of both the streamwise mean velocity and turbulent intensity distributions in the near flowfield. Potential core lengths nondimensionalized by jet nozzle width d for the cruciform jets are larger than those for two-dimensional and axisymmetric jets. Furthermore, a relationship between the aspect ratio and the potential core length is examined and it is clearly shown that the potential core length could be significantly controlled by the variation of the magnitude of the inward secondary flow velocity on both the y and z axes for the cruciform jets.
5th International Symposium on Fluid Structure International, Aeroeslasticity, and Flow Induced Vibration and Noise | 2002
Shigetaka Fujita; Takashi Harima; Hideo Osaka
The mean and turbulent flow properties of turbulent jet issuing from a quasi two-dimensional (2-D) nozzle with a rectangular notch (aspect ratio: AR=12.5) perpendicular to the two-dimensional nozzle at the midspan, have been measured. The exit Reynolds number was kept constant 13000. The aim of this study is to examine the effects of the rectangular notch on the mean and turbulent flowfields of the two-dimensional jet, and to clarify a possibility of a passive control of the two-dimensional jet using a rectangular notch. From the experiments, it was revealed that the potential core region existed until the section of x/d=25. In the upstream region, the entrainment rate was smaller than that of the two-dimensional jet due to the inward secondary flow on the y and z axes. Furthermore, the streamwise development of the turbulent intensity was delayed.Copyright
The Proceedings of Conference of Chugoku-Shikoku Branch | 2000
Takashi Harima; Shigetaka Fujita; Hideo Osaka
Jsme International Journal Series B-fluids and Thermal Engineering | 1985
Shigetaka Fujita; Hideo Osaka; Goro Ueno
Transactions of the Japan Society of Mechanical Engineers. B | 2006
Shigetaka Fujita; Takashi Harima; Hideo Osaka
Transactions of the Japan Society of Mechanical Engineers. B | 2004
Takashi Harima; Shigetaka Fujita; Hideo Osaka
Jsme International Journal Series B-fluids and Thermal Engineering | 1986
Shigetaka Fujita; Hideo Osaka; Goro Ueno
Transactions of the Japan Society of Mechanical Engineers. B | 1993
Shigetaka Fujita; Hideo Osaka
Archive | 1990
Shigetaka Fujita; Goro Ueno; Hideo Osaka
Food Microbiology | 2018
Shigetaka Fujita; Takashi Harima; Tsukuru Kunihiro
