C116 チャネル乱流に対する安定成層の影響

概要

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Effect of stable staratification on a turbulent channel flow has been studied experimentally. The simultaneous measurement of both temperature and streamwise velocity fluctuations has been conducted by using two-wire probe which consists of hot wire and cold wire. The cold wire which is located upstream of the hot wire had a diameter of 0.6μm. This small diameter contributes to minimize the sampling volume of the instrument and the response crror of cold wire itself. In order to vary the effect of stratification the channel itself is turned in the surface which is perpendicular to the streamwise axis. This procedure makes it possible to change the effect of the buoyancy force on the turbulence without changing the temperature gradient, which result in the minimizing inevitable measurement errors. The streamwise velocity profile was measured and a favorable log law profile was obtained.
日本流体力学会の論文
2000-07-25