浮遊気泡最大径の測定による気泡相当径の決定

概要

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The equivalent diameter of a bubble rising in liquid has been measured as a function of the floating bubble diameter at gas/liquid interface. Measurements were carried out over the floating bubble size range 0.26 to 2.18 cm and for various liquids (tap water, 8.98 kmol/m3 glycerin aq. solution, and 0.016 and 0.328 mol/m3 sodium oleate aq. solutions). Bubble equivalent diameter and floating bubble diameter were measured by the sonic pulse response method and the vertical photographic method, respectively. As a result, the following empirical equation is proposed : D0=0.679Df+0.120 where Df means maximum floating bubble diameter and D0 is equivalent diameter of bubble rising in liquid. In addition, the following observations are made. 1) This equation has a bias within 5.5 %. 2) It can be considered that there is no effect of surface tension or viscosity of liquids on maximum floating bubble diameter. 3) Floating bubble configuration becomes steady in a short time, while the life time of a floating bubble is appreciably long, and so Df is easily measured.
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