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Study of thermodiffusion of carbon dioxide in binary mixtures of n-butane & carbon dioxide and n-dodecane & carbon dioxide in porous media

机译:多孔介质中正丁烷与二氧化碳,正十二烷与二氧化碳的二元混合物中二氧化碳的热扩散研究

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摘要

Convection due to a thermodiffusion phenomenon has an important effect on component separation of hydrocarbon mixtures in a porous medium. A numerical study of carbon dioxide diffusion in porous medium is investigated in the presence of different fluid mixtures such as n-butane & carbon dioxide and n-dodecane & carbon dioxide single phase. In this paper, all physical properties with an exception of the mixture conductivity are assumed as varying with temperature and concentration. The fluid is maintained at a pressure of 150 bar and remains in the liquid state. Constant temperature gradients in horizontal and vertical directions are applied on the three-dimensional porous domain. Thermodiffusion coefficients applied in simulation were calculated by using Abbasi et al.'s [J. Non-Equilib. Thermodyn. 35 (2010) 1] thermodiffusion model. Results reveal that for a certain concentration of carbon dioxide, the thermodiffusion coefficient reaches a maximum leading to large separation. In the presence of the Soret effect, the vertical density distribution tends closer to the one without the Soret effect. With an increase in the permeability, the convection becomes dominant and contributes to a decrease in the vertical and horizontal component separation considerably.
机译:由热扩散现象引起的对流对多孔介质中烃混合物的组分分离具有重要影响。在存在不同流体混合物(例如正丁烷和二氧化碳以及正十二烷和二氧化碳单相)的情况下,研究了二氧化碳在多孔介质中扩散的数值研究。在本文中,除混合物电导率外,所有物理性质均假设随温度和浓度而变化。流体保持在150 bar的压力下并保持液态。将水平和垂直方向的恒定温度梯度应用于三维多孔区域。模拟中应用的热扩散系数是使用Abbasi等人的方法计算得出的。非Equilib。 Thermodyn。 35(2010)1]热扩散模型。结果表明,对于一定浓度的二氧化碳,热扩散系数达到最大值,导致较大的分离。在存在Soret效应的情况下,垂直密度分布趋于接近没有Soret效应的密度分布。随着渗透率的增加,对流变得占优势,并极大地减少了垂直和水平分量的分离。

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