PIV AND LIF MEASUREMENTS OF COHERENT VORTEX AND THE ASSOCIATED MASS TRANSFER IN PERMEABLE SIDE-CAVITY OPEN-CHANNEL FLOWS

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  • 浸透性ワンド流れにおける組織渦と物質輸送に関するPIVおよびLIF計測
  • シントウセイ ワンド ナガレ ニ オケル ソシキカ ト ブッシツ ユソウ ニ カンスル PIV オヨビ LIF ケイソク

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Abstract

Measurements of velocity and dye concentration in side-cavity that consisted of permeable walls were conducted by PIV and LIF. Measurements of flow properties were conducted by PIV. In contrast, a DV-camera was used to measure the dye concentration. The permeable flow from the inside of the side cavity was divided into 4 kinds of patterns, i.e., the patterns from the (1) upstream wall, (2) the side wall, (3) the downstream wall and (4) all walls. The aspect ratio (the streamwise length of the side cavity/the spanwise length of the side cavity) was set to 2 for all experiments. The Froude number was set to 0.27. In this study, the effects of permeable flow on flow patterns and dye concentration properties were examined. A large-scale vortex was generated along the downstream in the side-cavity. High concentration regions were observed upstream inside of the side-cavity. In contrast, low concentration regions were observed in the large-scale vortex. The large RMS value region of the concentration fluctuations was observed in both the interface region and the collision region between large-scale vortex and permeable flow.

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