Carbon dioxide is considered as the main greenhouse gas responsible for climate change. Absorption of CO₂ by liquid phase has gained attention as a means of mitigating environmental challenges. In this study, the effect of Fe₃O₄ nanoparticles on the CO₂‐water mass transfer coefficient was experimentally evaluated in the presence and absence of a magnetic field. The absorption experiments were carried out in a falling liquid film absorber system in laminar and turbulent flow regimes. Fe₃O₄/water nanofluid was used in 0.001‐0.05 vol% concentrations. The results show that adding Fe₃O₄ nanoparticles to water increases the mass transfer coefficient (MTC), and that it increases with an increase in nanofluid concentration. For a concentration of 0.05 vol% nanofluid, the MTC was improved 111% and 13.7% in the turbulent and laminar flow regimes, respectively. The mass transfer coefficient of CO₂ in water and effective mass transfer coefficient in nanofluid were increased up to 10% and 29% in the presence of a parallel alternative magnetic field, respectively.

中文翻译：

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磁场作用下Fe3O4 /水纳米流体降落液膜对CO2吸收的改善

二氧化碳被认为是造成气候变化的主要温室气体。作为减轻环境挑战的手段，液相吸收CO ₂已引起关注。在这项研究中，在有磁场和无磁场的情况下，通过实验评估了Fe ₃ O ₄纳米颗粒对CO _2-水传质系数的影响。吸收实验是在降液膜吸收器系统中以层流和湍流方式进行的。Fe ₃ O ₄ /水纳米流体的浓度为0.001-0.05％。结果表明添加Fe ₃ O ₄纳米颗粒与水的结合增加了传质系数（MTC），并且随着纳米流体浓度的增加而增加。对于浓度为0.05％（体积）的纳米流体，在湍流和层流状态下，MTC分别提高了111％和13.7％。在存在平行交变磁场的情况下，水中CO _2的传质系数和纳米流体中的有效传质系数分别提高了10％和29％。