Radial bubble velocities, chord lengths, and local gas holdups were measured by a dual-tip conductivity probe in a slender particle-containing scrubbing–cooling chamber. The annulus region of the bubbling bed was divided into three regions according to the radial distributions of bubble velocity, bubble size, and local gas holdup. Bubble velocity distributions were obtained by the kernel density estimation, and the relationships between mean bubble velocity and diameter were discussed. The interfacial area was calculated by the size distribution of total bubbles in the bed which was transformed from that of total bubbles touching the probe by an analytical transformation method. Effects of superficial gas velocity, fiber volume fraction, and aspect ratio on the distributions of bubble velocity and interfacial area were discussed. The experimental interfacial area values were in good agreement with the calculated ones obtained by the modified Besagni and Inzoli correlation.

中文翻译：

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气流床气化炉细长含颗粒洗涤冷却室中气泡速度和界面面积的局部分布

径向气泡的速度，弦长和局部气体滞留率是通过双尖电导率探头在一个细长的含颗粒洗涤冷却室内进行测量的。根据气泡速度，气泡大小和局部气体滞留量的径向分布，将鼓泡床的环形区域分为三个区域。通过核密度估计获得气泡速度分布，并讨论了平均气泡速度与直径之间的关系。界面面积通过床中总气泡的尺寸分布计算得出，该分布是通过解析转换方法从接触探针的总气泡的尺寸转换而来的。讨论了表观气体速度，纤维体积分数和长宽比对气泡速度和界面面积分布的影响。