The knowledge of the local gas–liquid slip velocity distribution can offer a better understanding for the complex transport phenomena in bubble columns. In this work, CFD–PBM simulations are carried out to investigate the effect of superficial gas velocities, axial positions, and scale of bubble columns on the time‐averaged radial profiles of gas–liquid slip velocities. Furthermore, the relationship between local slip velocities and local heat transfer coefficients in pilot‐scale bubble columns at superficial gas velocities of 0.05 m/s, 0.20 m/s, and 0.35 m/s is studied. The results indicate that the slip velocities decrease with the increase of r/R (r‐radial position, R‐column radius), while increase with increasing superficial gas velocities in general. In the fully developed region, the axial positions have small impact on the local slip velocities. A strong linear relation between heat transfer coefficients and slip velocities in the fully flow developed region is observed.

中文翻译：

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鼓泡塔内气液滑移速度的局部分布及其与传热的关系

局部气液滑移速度分布的知识可以更好地理解气泡塔中的复杂输运现象。在这项工作中，进行了CFD–PBM模拟，以研究表气速度，轴向位置和气泡柱的规模对气液滑移速度的时间平均径向分布的影响。此外，研究了在表气速度为0.05 m / s，0.20 m / s和0.35 m / s的中试规模气泡塔中的局部滑移速度与局部传热系数之间的关系。结果表明，滑移速度随着r / R的增加而减小（r径向位置，R柱半径），但通常随着表观气体速度的增加而增加。在完全发达的区域，轴向位置对局部滑移速度的影响很小。在全流展开区域中，观察到了传热系数和滑移速度之间的强线性关系。