Experimental and CFD analysis of two-phase flow in a ceramic porous media under plasma-assisted wastewater treatment conditions

IF 3.9 3区工程技术 Q2 ENGINEERING, CHEMICAL

Chemical Engineering Research & Design Pub Date : 2025-09-18 DOI:10.1016/j.cherd.2025.09.030

Masoud Haghshenasfard , Stefan Schönekerl , Gisa Scale , Christel Pfefferkorn , Daniela Haase , Sarah Trepte , Hossein Mehdipour , André Lerch

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Abstract

This study investigates hydrodynamic parameters governing pollutant degradation in a low-temperature plasma (LTP) reactor utilizing porous alumina ceramic media. A validated 3D Volume of Fluid (VOF) model simulated air–water two-phase flow to resolve film thickness, wettability, wetting area, residence time, and liquid hold-up across varying flow rates. Experimental measurements confirmed the CFD predictions and showed that increasing the flow rate led to a sharp decline in degradation efficiency due to reduced residence time and increased film thickness. Notably, maximum degradation (∼33.4 mg/L) occurred at intermediate flow conditions (Q ≈ 7.0 L/h, RT ≈ 6.1 s), whereas degradation stagnated at higher flow rates due to shortened treatment time and possible side reactions indicated by conductivity shifts. Kinetic analysis of the experimental data confirmed a zero-order degradation mechanism, with a strong linear correlation between residence time and indigo carmine removal (R² = 0.997). Regression and desirability-based optimisation identified 10.97 L/h as the ideal flowrate, balancing surface wetting and residence time for effective degradation (∼31.2 mg/L). Sensitivity analysis confirmed that film thickness and residence time were the most influential factors. The study offers a quantitative framework for optimising LTP reactors by integrating CFD, experiments, and multi-criteria optimisation.

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等离子体辅助废水处理条件下陶瓷多孔介质两相流的实验与CFD分析

本研究利用多孔氧化铝陶瓷介质，研究了控制低温等离子体（LTP）反应器中污染物降解的流体动力学参数。经过验证的3D流体体积（VOF）模型模拟了空气-水两相流动，以解决不同流速下的膜厚度、润湿性、润湿面积、停留时间和液体持有率。实验结果证实了CFD的预测，表明流速的增加会导致降解效率急剧下降，因为停留时间缩短，膜厚增加。值得注意的是，最大降解（~ 33.4 mg/L）发生在中等流量条件下（Q≈7.0 L/h, RT≈6.1 s），而由于处理时间缩短和电导率变化可能引起的副反应，降解在较高流速下停滞。实验数据的动力学分析证实了零级降解机制，停留时间与靛蓝胭脂红去除率呈较强的线性相关（R²= 0.997）。回归和基于期望的优化确定10.97 L/h为理想流速，平衡表面润湿和有效降解的停留时间（~ 31.2 mg/L）。敏感性分析证实，膜厚和停留时间是影响最大的因素。该研究通过整合CFD、实验和多准则优化，为LTP反应器的优化提供了一个定量框架。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Chemical Engineering Research & Design 工程技术-工程：化工

CiteScore

6.10

自引率

7.70%

发文量

623

审稿时长

42 days

期刊介绍： ChERD aims to be the principal international journal for publication of high quality, original papers in chemical engineering. Papers showing how research results can be used in chemical engineering design, and accounts of experimental or theoretical research work bringing new perspectives to established principles, highlighting unsolved problems or indicating directions for future research, are particularly welcome. Contributions that deal with new developments in plant or processes and that can be given quantitative expression are encouraged. The journal is especially interested in papers that extend the boundaries of traditional chemical engineering.