E203 ワイヤーメッシュセンサによる気泡速度の評価(OS-10 混相流動(2),一般講演,地球温暖化防止と動力エネルギー技術)

概要

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A wire-mesh sensor (WMS) has been applied to study the air-water bubbly flow structure in a vertical channel. The WMS provides the instantaneous cross-sectional gas fraction distributions, which are measured by detecting the local conductivity between two electrode wires with right angles to each other. From the measured gas fraction data, the individual bubble diameter and the velocity are evaluated by data processing. In the WMS measurement, the intrusive effects, which are caused by the wires installed in the flow, cannot be negligible. Therefore, the effects were examined, and the bubble deceleration and acceleration effects within the WMS were observed by processing high speed camera (HSC) images. In order to investigate the influence of these velocity dependent effects on the bubble velocity measurement, a comparison of the parameters were carried out for each bubble individually. The bubble identity in the WMS and HSC data was ensured by analyzing the bubble location and the time of occurrence. After that, the bubble velocity was compared.
社団法人日本機械学会の論文
2008-06-18