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The effect of surfactants on the initiation and development of air–water slug flow in hilly terrain pipeline
Experimental Thermal and Fluid Science ( IF 3.2 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.expthermflusci.2020.110139
Pengbo Yin , Xuewen Cao , Chao Wu , Sisi Qin , Pan Zhang , Jiang Bian

Abstract In hilly terrain pipelines, gas–liquid slug flow usually forms in the low-lying elbow and develops in the inclined ascending pipe at a low superficial liquid velocity and influences the effective and safe natural gas transportation. The surfactant additive has a significant effect on this flow and promotes the liquid drainage in hilly terrain pipelines. To further understand the interaction mechanism between surfactants and gas–liquid flow, an experimental investigation of the initiation and development of slug flow with and without surfactants was performed. The acrylic test tubes consisted of an inclined descending pipe, a horizontal pipe and an inclined ascending pipe with a 50 mm ID and inclination angles of ±10°. The 100 parts per million (ppm) of sodium dodecyl sulfate (SDS) and 100 ppm of sodium dodecyl benzoyl sulfate (SDBS) were respectively used as surfactant additives in this work. The flow behavior of slug initiation and development was observed by a visual system and measured using multiple 2 MHz ultrasonic transducers in the elbow and inclined pipeline. The flow morphology of slug flow changed significantly with the foam formation in the air–surfactant solutions flow. The slug frequency, the liquid film and velocity variation and the velocity characteristics of slug flow were obtained and analyzed based on the measured echo and velocity profiles. The addition of surfactants weakened the strong gas–liquid interaction at the front of liquid slug and increased the velocity of backflow in the liquid film. The experiment results make the effect of surfactants on the gas–liquid interface and velocity characteristics of slug flow in hilly terrain pipelines more clear.

中文翻译:

表面活性剂对丘陵地区管道气水段塞流发生和发展的影响

摘要 在丘陵地带管道中,气液段塞流通常在低位弯头形成,在斜上升管中以较低的表观液速发展,影响天然气的有效安全输送。表面活性剂添加剂对这种流动有显着影响,并促进丘陵地带管道的排液。为了进一步了解表面活性剂与气液流动之间的相互作用机制,对有和没有表面活性剂的段塞流的发生和发展进行了实验研究。亚克力试管由内径50mm、倾角±10°的斜降管、水平管和斜升管组成。在这项工作中,分别使用百万分之 100 (ppm) 的十二烷基硫酸钠 (SDS) 和 100 ppm 的十二烷基苯甲酰硫酸钠 (SDBS) 作为表面活性剂添加剂。段塞萌生和发展的流动行为通过视觉系统进行观察,并在弯头和倾斜管道中使用多个 2 MHz 超声换能器进行测量。段塞流的流动形态随着空气-表面活性剂溶液流中泡沫的形成而发生显着变化。基于测得的回波和速度剖面,获得并分析了段塞频率、液膜和速度变化以及段塞流的速度特性。表面活性剂的加入减弱了液段塞前端的强气液相互作用,增加了液膜中的回流速度。
更新日期:2020-09-01
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