AM06-21-005 高Schmidt数乱流噴流におけるスカラーフラックスの統計的特性に関する研究(乱流熱物質移動(2),一般講演)

概要

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In this paper, we investigate the statistical characteristics of the mass flux in an axisymmetric turbulent jet diffusion field of a high-Schmidt-number matter. The diffusing fluid is a dye solution (Sc≃3,800), and five different jet Reynolds numbers are chosen, i.e. 6,600, 9,900, 13,300, 15,500, 17,700. The simultaneous measurements of two velocity components and concentration have been made by a combined probe of an X-type hotfilm and a fiber-optic concentration sensor. It is found that the scalar flux is not affected by the scale smaller than the scale of the velocity fluctuation. The axial velocity-concentration cospectra on the jet centerline show the -7/3 scaling law. And their scaling range agree with the overlap range of the inertial subrange and the convective subrange. On the other hand, The radial velocity-concentration cospectra near the jet centerline (r/b_U=0.73) show about -2 scaling law.
日本流体力学会の論文
2006-09-05