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Mass transfer of corrosion species in vertical multiphase flow: A mechanistic approach.

机译：垂直多相流中腐蚀物质的传质：一种机械方法。

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This dissertation presents a study on mass transfer predictions in multiphase flow. Mass transfer plays an important roll in corrosion process due to its strong influence on corrosion rate. A mechanistic model has been developed for predicting mass transfer coefficient in vertical multiphase flow.; The similarities between heat and mass transfer mechanisms are utilized in the development of the new mechanistic model that is proposed in this dissertation. The model was evaluated by a sensitivity analysis and comparison with water-air heat transfer experimental data obtained from the literature. The sensitivity analysis shows that sensitivities of the model prediction agree with experimental data, except for vertical annular flow for the region with lower Nusselt number. Based on comparison with experimental data, the model can predict mass transfer coefficient within a 10% error for vertical bubbly flow, and 30% error for vertical intermittent flow and vertical annular flow.; The model shows better overall performance than existing correlations, based on comparisons with experimental data, except for the region with lower Nusselt number for annular flow.; Experimental data on CO2 corrosion under no scale forming condition using the CO2 flow loop at the Erosion Corrosion Research Center, E/CRC. The CO2 corrosion experiment was conducted using distilled water as the liquid phase and CO2 at 50 psig as the gas phase. The data included single-phase liquid flow, vertical bubbly flow, vertical intermittent flow, and vertical annular flow. The results of the CO2 corrosion rate predictions using the newly developed mechanistic model were in agreement with the experimental data. CO2 corrosion is controlled by different mechanism at different velocities. At low velocities, the corrosion rate is mass transfer rate controlled, whereas at high velocities, it is mostly reaction rate controlled.
机译：本文对多相流传质预测进行了研究。传质由于对腐蚀速率的强烈影响，在腐蚀过程中起着重要的作用。已经建立了用于预测垂直多相流中传质系数的机械模型。本文提出的新的机械模型利用了传热传质机理之间的相似性。通过敏感性分析对模型进行评估，并与从文献中获得的水-空气传热实验数据进行比较。敏感性分析表明，模型预测的敏感性与实验数据吻合，除了具有较低努塞尔特数的区域的垂直环形流动外。基于与实验数据的比较，该模型可以预测垂直气泡流的传质系数误差在10％以内，垂直间歇流动和垂直环形流的误差在30％以内。根据与实验数据的比较，该模型显示出比现有相关性更好的总体性能，但环形流的Nusselt值较低的区域除外。 E / CRC腐蚀研究中心使用CO 2 流回路在无水垢形成条件下对CO 2 腐蚀的实验数据。以蒸馏水为液相，以50 psig的CO 2 为气相，进行了CO 2 腐蚀实验。数据包括单相液体流，垂直气泡流，垂直间歇流和垂直环形流。使用新开发的机理模型预测的CO 2 腐蚀速率的结果与实验数据相符。 CO 2 的腐蚀受不同机理，不同速度的控制。在低速下，腐蚀速率受传质速率控制，而在高速度下，腐蚀速率主要受反应速率控制。

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