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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >The effect of surfactants on the initiation and development of air-water slug flow in hilly terrain pipeline
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The effect of surfactants on the initiation and development of air-water slug flow in hilly terrain pipeline

机译：表面活性剂对丘陵地形管道的气水块流动启动与发展的影响

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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 degrees. 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.
机译：在丘陵地形管道中，气液块流通常在低洼肘部中形成，并以低浅表液体速度在倾斜的上升管中开发，并影响有效和安全的天然气运输。表面活性剂添加剂对该流动具有显着影响，并促进丘陵地形管道的液体排水。为了进一步了解表面活性剂和气液流动之间的相互作用机制，进行了用和不含表面活性剂的裂片流动的起始和发育的实验研究。丙烯酸类试管由倾斜下降管，水平管和倾斜上升管组成，具有50mm ID和+/- 10度的倾斜角度。在这项工作中分别用作硫酸十二烷基硫酸钠（SDS）和100ppm的十二烷基苯甲酰基硫酸钠（SDB）的100倍（ppm）。通过视觉系统观察到SLUIN启动和开发的流动行为，并在肘部和倾斜管道中使用多个2MHz超声换能器测量。泡沫流动的流动形貌随着空气表面活性剂溶液流动的泡沫形成而变化。基于测量的回声和速度分布，获得了块频率，液体膜和速度变化和块流的速度特性和分析。表面活性剂的添加削弱了液体块前面的强气液相互作用，并增加了液体膜中的回流速度。实验结果使表面活性剂对丘陵地形管道中的瓶盖流动的气液界面和速度特性进行了更清晰。

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