2128 気液二相流における超音波計測とワイヤーメッシュトモグラフィ計測の比較  [in Japanese] The Comparison of Ultrasonic Doppler Method and Wire Mesh Tomography in bubbly flow measurement  [in Japanese]

In this paper, combination measurement of ultrasonic Doppler method (UDM) and wire mesh tomography (WMT) techniques for two-phase bubbly flow measurement are proposed. The UDM can measure instantaneous velocity profiles along its measuring line. By applying statistical methods, the UDM can obtain liquid parameters in bubbly flow. The WMT is based on local conductivity measurement and can measure the two-dimensional void fraction distribution and bubble diameter. Using both techniques at the same conditions, the effects of the seeding particles in the liquid as reflector of ultrasonic are investigated. Furthermore, the void fraction is measured by taking the bubble diameter as the parameter. The measurement results clarified that bubble size plays very important roles for two-phase structures and the effectiveness of these techniques are shown.