【摘要】 为了研究泡罩在静止液体中的鼓泡特性,用双头电导探针测试了不同气量下不同轴向位置处的相界面参数——局部含气率、界面浓度、气泡平均尺寸,得出了它们沿径向的分布规律:在轴向高度略高于泡罩高度处,局部含气率呈中间峰值分布形态,在径向r/R=0.42处出现了局部含气率峰值,随着轴向高度的增加,局部含气率峰值逐渐向塔中心区域移动;同气量下界面浓度沿轴向的变化规律与局部含气率相似;气泡平均尺寸在同气量下随高度的增加,有减小的趋势。更多还原

【Abstract】 In order to study the bubbling characteristic of single bubble cap in stagnant liquid, double-sensor conductivity probe has been used to determine the phase interfacial parameters such as local void fraction, interfacial area concentration and mean bubble size at the conditions with different gas volume flux and different height. Distribution laws of these interfacial parameters have been achieved: the local void fraction profile exhibits a "core peaking" configuration at about r/R=0.42, moreover, the void peaking (locations) move gradually toward the center of the column along the axial; at the same gas volume flux, the interfacial concentration resembles the local void fraction in the distribution law along the axial; the mean diameter of bubble trends to decrease along the axial.更多还原