回転楕円体気泡の径,形状,移動方向,移動速度の同時測定に関する一方法

概要

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A compact unit was devised from a pair of circular beams crossing each other perpendicularly and of photosensors for each beam. This unit was immersed in liquid. Only the bubble which passes through the intersection zone of the beams gives similar response curve of light detected on the sensors. The curve was compared with theoretical ones.<BR>In theory, bubbles were assumed to be rotating ellipsoids which moved toward their axes of rotations. Variation of light detected on the sensor through refraction within bubble and reflection on bubble surface was calculated geometrically for the bubble passing through the intersection zone. Results of calculations showed that it is convenient to use a set of parameters to estimate bubble volume and major-to-minor radius ratio for curve recognition. These were average gradients of the initial response and maximum light recovery due to refraction of light within the bubble.<BR>Bubbles moving in an inclined direction to the beam in the detecting zone gave an unsymmetric response curve. An Approximate method of estimating equivalent diameter and alb is also presented for the case.<BR>Bubble speed was calculated from the time covered by the bubble and equivalent bubble size. The direction of bubble motion can also be recognized if the photo sensor is divided into many small elements, at least four.
社団法人化学工学会の論文