Experimental study of the hydrodynamic behaviour of slug flow in a vertical riser
Experimental study of the hydrodynamic behaviour of slug flow in a vertical riser
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DOI：
10.1016/j.ces.2013.11.021
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发表时间：
2014-03
影响因子：
4.7
通讯作者：
M. Abdulkadir;V. Hernandez-Perez;I. Lowndes;B. Azzopardi;S. Dzomeku
中科院分区：
文献类型：
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作者：
M. Abdulkadir;V. Hernandez-Perez;I. Lowndes;B. Azzopardi;S. Dzomeku
本文对内径为67 mm的竖直立管内段塞流的流体力学进行了研究。段塞流是使用多相空气-硅油混合物在气相(0.42；Usg<；1.35m/S)和液体(0.05g/lt；Usl<；0.38m/S)表面速度范围内产生的。利用电容层析成像(ECT)测量了泰勒气泡和液塞的速度、弹状频率、泰勒气泡和液塞的长度、泰勒气泡和液塞内的空泡比例和液膜厚度。采用差压传感器测量沿立管长度方向的压降。结果表明，泰勒气泡的平移速度(结构速度)强烈依赖于混合气的表观速度。随着气相表观速度的增加，液塞和泰勒气泡的含气率、长度和含气率都增加。气体表观速度的增加导致管道内摩擦压降的增加，而沿提升管长度的总压降(由流体静力压降和摩擦压降之和)减小。此外，还观察到液塞频率随液体表观速度的增加而增加，但与气相表观速度的关系不大。手工计数法与功率谱密度(PSD)计算法的计算结果吻合较好。
This paper presents an investigation of the hydrodynamics of slug flow in a vertical 67 mm internal diameter riser. The slug flow regime was generated using a multiphase air–silicone oil mixture over a range of gas (0.42<USG<1.35 m/s) and liquid (0.05<USL<0.38 m/s) superficial velocities. Electrical capacitance tomography (ECT) was used to determine: the velocities of the Taylor bubbles and liquid slugs, the slug frequencies, the lengths of Taylor bubbles and the liquid slugs, the void fractions within the Taylor bubbles and liquid slugs and the liquid film thicknesses. A differential pressure transducer was used to measure the pressure drops along the length of the riser. It was found that the translational velocity of a Taylor bubble (the structure velocity) was strongly dependent on the mixture superficial velocity. As the gas superficial velocity, was increased, the void fraction and the lengths of the liquid slugs and the Taylor bubbles were observed to increase. The increase in gas superficial velocity causes an increase in the frictional pressure drop within the pipe, whilst the total pressure drop (which is a sum of the hydrostatic and frictional pressure drop) along the length of the riser decreases. In addition, the frequencies of the liquid slugs were observed to increase as the liquid superficial velocity increases, but to be weakly dependant on the gas superficial velocity. The manual counting method for the determination of slug frequency was found to be in good agreement with the power spectral density (PSD) computed method.