Experimental investigation of interfacial mixing characteristics during sequential transportation of white oil-water immiscible system

LIU Jinwei; LV Pin; AN Zhenwu; MAO Gangtao; WANG Kai

doi:10.12434/j.issn.2097-2547.20250398

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Experimental investigation of interfacial mixing characteristics during sequential transportation of white oil-water immiscible system

更新时间：2026-04-22

- Experimental investigation of interfacial mixing characteristics during sequential transportation of white oil-water immiscible system
- Pages: 1-11(2026)
- 作者机构：
  
  1.中海油能源发展装备技术有限公司，天津 300452
  2.国家石油天然气管网集团有限公司西北分公司，宁夏银川 750001
  3.北京石油化工学院深水油气管线关键技术与装备北京市重点实验室，北京 102617
- 作者简介：
- 基金信息：
- DOI：10.12434/j.issn.2097-2547.20250398
  CLC： TE832
- Received：12 October 2025，
  
  Revised：2025-11-09，
  
  Online First：19 April 2026，
- 稿件说明：
移动端阅览
刘锦伟,吕品,安振武等.白油-水非混溶体系顺序输送界面掺混特性的实验研究[J].低碳化学与化工,

LIU Jinwei,LV Pin,AN Zhenwu,et al.Experimental investigation of interfacial mixing characteristics during sequential transportation of white oil-water immiscible system[J].Low-Carbon Chemistry and Chemical Engineering,
刘锦伟,吕品,安振武等.白油-水非混溶体系顺序输送界面掺混特性的实验研究[J].低碳化学与化工, DOI：10.12434/j.issn.2097-2547.20250398.

LIU Jinwei,LV Pin,AN Zhenwu,et al.Experimental investigation of interfacial mixing characteristics during sequential transportation of white oil-water immiscible system[J].Low-Carbon Chemistry and Chemical Engineering, DOI：10.12434/j.issn.2097-2547.20250398.

摘要

随着绿色能源体系的快速发展，海底管道正面临着如非混溶体系顺序输送等日益复杂的运行工况，批次间掺混风险显著增大。为了明确此类体系在输送过程中的界面演化及掺混特性，创新性地利用全可视化轮式环路和565  m长距离缩尺多相流环路，并选取白油-水非混溶体系开展实验，系统研究了非混溶体系顺序输送过程中的混油行为，揭示其掺混机理和主控因素，并提出可参考的优化输送策略。结果表明，非混溶体系的掺混行为受流体剪切、湍流及重力不稳定性的共同控制。低流速时，流型以稳定的分层流为主，掺混段长但含油率低。高流速时，分层流转为分散流，湍流促进油滴细化和壁膜剥离，掺混现象集中于水段塞两端。实验条件下，分散流中含油段长度最低可降至分层流的28.56%，而出口平均含油率为分层流的2.68倍。基于上述结果，建议在能耗可控的前提下采用较短的初始油塞，在较高流速下维持分散流输送，并采用低黏度相先行、高黏度油相后行的输送策略，以缩短掺混段、抑制壁膜拖尾，从而提升输送稳定性。研究结果可为非混溶体系顺序输送中的掺混风险管控与操作参数优化提供参考，助力多元能源安全高效输送。

Abstract

With the rapid development of green energy systems

subsea pipelines are facing increasingly complex operating conditions such as the sequential transportation of immiscible systems

and the inter-batch mixing risk is significantly increased. To clarify the interface evolution and mixing characteristics of such systems during transportation

a fully visualized wheel loop and a 565 m long-distance scaled multiphase flow loop were innovatively employed. A white oil-water immiscible system was selected to carry out experiments. The mixed-oil behavior during sequential transportation of immiscible systems was systematically investigated

and the mixing mechanism and dominant controlling factors were revealed

and feasible optimization transportation strategies were proposed. The results show that the mixing behavior of immiscible systems is jointly controlled by fluid shear

turbulence and gravitational instability. At low flow rates

the flow pattern is dominated by stable stratified flow

with a long mixing section but low oil content. At high flow rates

the stratified flow transitions to dispersed flow

where turbulence accelerates droplet breakup and wall-film detachment

and the mixing is concentrated at the two ends of the water slug. Under the experimental conditions

the minimum length of the oil-containing section in dispersed flow can be reduced to 28.56% of that in stratified flow

while the average oil content at the outlet is 2.68 times that of stratified flow. Based on the above results

it is recommended

under the premise of controllable energy consumption

to adopt shorter initial oil slugs

maintain dispersed flow transportation at relatively high flow rates

and apply a transportation strategy in which the low-viscosity phase precedes and the high-viscosity oil phase follows

so as to shorten the mixing section and suppress wall-film trailing

thereby improving transportation stability. This results can provide a reference for mixing risk control and operation parameter optimization in the sequential transportation of immiscible systems

and support the safe and efficient transportation of multi-energy systems.

关键词

Keywords

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