マイクロバブルを用いた超音波流速分布計による鉛直管内乱流の速度分布と速度変動の測定(流体工学,流体機械)

概要

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In this study, the authors adopted micro bubbles generated by the pressurized dissolution method for the UVP measurement as the reflector of the ultra sound. They are economy and environment-friendly compared with fine solid particles which may pollute the environment. In this study, we used micro bubbles and polyethylene particles for UVP measurement in order to compare the influence of reflectors. In addition, we directly inserted the transducer of the UVP with an accurate movable device into the flow parallel to the flow axis. This method is free from the effects of reflection and refraction at the pipe wall unlike the UVP measurement through the pipe wall, although this method has the disadvantage of the arrangement of the transducer that was immersed in the liquid. The measurement accuracy of the velocity profiles and the possibility of the velocity fluctuation measurement concerning with turbulent intensity using this method was investigated. As a result, the RMS value of the velocity fluctuation, as well as velocity profiles, using axial measurement with micro bubbles as reflectors agreed well with the tendencies of existing data.
一般社団法人日本機械学会の論文
2009-02-25