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EXPERIMENTAL STUDY ON STATISTICAL CHARACTERISTICS OF THE JET DIFFUSION FIELD

Yasuhiko Sakai
Department of Mechanical Science and Engineering, Nagoya University, Nagoya, 464-8603, Japan

Kenji Uchida
Department of Mechano-lnformatics & Systems, Nagoya University Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan

Takehiro Kushida
Department of Mechanical Engineering, Nagoya University, Chikusa-ku, Furo-cho, Nagoya, 464-8603, JAPAN

Resumo

It is important in engineering to clarify the passive scalar diffusion mechanism in turbulent shear flows in relation to the mixing of various fluids and the diffusion of pollutants. Although there are many reports about the measurements of scalar, for example, the temperature difference (Chevray and Tutu,1979, Venkataramani et al.,1975, Browne et al.,1984, Zhu et al.,1988), the concentration of gas (Panchapakesan and Lumely,1993) and the concentration of dye solution (Okada et al.,2001), there still remain the unclear points on the statistical characteristics of scalar (for example, the departure from the local isotropy and the internal intermittency (Warhaft,2000)). In this study, as the fundamental reseach on the passive scalar diffusion in a turbulent flow, the measurements of the instantaneous value of scalar (concentration) at one point in a liquid phase turbulent jet have been made by using the fiber optic concentration sensor, and the distributions of the various scalar statistics obtained from the recorded data were investigated.