Purpose

This study aims to investigate the formation and characteristics of Taylor bubbles resulting from short-time gas injection in liquid-conveying pipelines. Understanding these characteristics is crucial for optimizing pipeline efficiency and enhancing production safety.

Design/methodology/approach

The authors conducted short-time gas injection experiments in a vertical rectangular pipe, focusing on Taylor bubble formation time and stable length. Computational fluid dynamics simulations using large eddy simulation and volume of fluid models were used to complement the experiments.

Findings

Results reveal that the stable length of Taylor bubbles is significantly influenced by gas injection velocity and duration. Specifically, high injection velocity and duration lead to increased bubble aggregation and recirculation region capture, extending the stable length. Additionally, a higher injection velocity accelerates reaching the critical local gas volume fraction, thereby reducing formation time. The developed fitting formulas for stable length and formation time show good agreement with experimental data, with average errors of 6.5% and 7.39%, respectively. The predicted values of the formulas in glycerol-water and ethanol solutions are also in good agreement with the simulation results.

Originality/value

This research provides new insights into Taylor bubble dynamics under short-time gas injection, offering predictive formulas for bubble formation time and stable length. These findings are valuable for optimizing industrial pipeline designs and mitigating potential safety issues.

中文翻译：

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短时注气下立管泰勒气泡特征参数的实验与数值研究

 目的

本研究旨在研究液体输送管道中短时注气产生的泰勒气泡的形成和特性。了解这些特性对于优化管道效率和提高生产安全性至关重要。

设计/方法/方法

作者在垂直矩形管道中进行了短时气体注入实验，重点关注泰勒气泡形成时间和稳定长度。使用大涡模拟和流体体积模型的计算流体动力学模拟来补充实验。

 发现

结果表明，泰勒气泡的稳定长度受气体注入速度和持续时间的显著影响。具体来说，高喷射速度和持续时间导致气泡聚集和再循环区域捕获增加，从而延长稳定长度。此外，更高的喷射速度会加速达到临界的局部气体体积分数，从而缩短形成时间。建立的稳定长度和形成时间拟合公式与实验数据吻合较好，平均误差分别为 6.5% 和 7.39%。公式在甘油-水和乙醇溶液中的预测值也与模拟结果非常吻合。

 原创性/价值

这项研究为短时注气下的泰勒气泡动力学提供了新的见解，为气泡形成时间和稳定长度提供了预测公式。这些发现对于优化工业管道设计和缓解潜在的安全问题很有价值。