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<p>Slug flow in horizontal two-phase pipelines causes severe pressure fluctuations, energy losses, and inefficient liquid transport. This study experimentally investigates the effect of sodium lauryl sulfate (SLS) surfactant on slug flow characteristics: slug frequency, slug length, slug velocity, liquid holdup, and drag reduction across a range of superficial liquid and gas velocities (<i>V</i><sub>sl</sub> and <i>V</i><sub>sg</sub>). Increasing SLS concentrations (0–200&#xa0;ppm) significantly improved the flow behaviour, slug frequency and length decreased by up to 100%, while slug velocity increased by up to 233% (with average changes of 69% and 68%, and 119%, respectively). These improvements contribute to enhanced flow stability, promoting transitions from slug to plug or stratified regimes. Furthermore, SLS reduces liquid holdup and drag losses by approximately up to 80% (54% average) and 83% (71% average), respectively. The key contribution of this work is the detailed evaluation of how SLS alters slug structure dynamics and enables surfactant-induced flow stabilisation in horizontal pipelines.</p>

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Impact of Surfactants on Slug Flow Characteristics and Liquid Accumulation in Horizontal Two-Phase Pipelines

  • 期刊论文

  • 发表日期：

    2026年2月23日

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  • Faaiz Al-shajalee,
  • Dana Badi,
  • Ahmad Sari

摘要

Slug flow in horizontal two-phase pipelines causes severe pressure fluctuations, energy losses, and inefficient liquid transport. This study experimentally investigates the effect of sodium lauryl sulfate (SLS) surfactant on slug flow characteristics: slug frequency, slug length, slug velocity, liquid holdup, and drag reduction across a range of superficial liquid and gas velocities (Vsl and Vsg). Increasing SLS concentrations (0–200 ppm) significantly improved the flow behaviour, slug frequency and length decreased by up to 100%, while slug velocity increased by up to 233% (with average changes of 69% and 68%, and 119%, respectively). These improvements contribute to enhanced flow stability, promoting transitions from slug to plug or stratified regimes. Furthermore, SLS reduces liquid holdup and drag losses by approximately up to 80% (54% average) and 83% (71% average), respectively. The key contribution of this work is the detailed evaluation of how SLS alters slug structure dynamics and enables surfactant-induced flow stabilisation in horizontal pipelines.