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CO2 diffusion in n-hexadecane investigated using magnetic resonance imaging and pressure decay measurements

机译：使用磁共振成像和压力衰减测量研究正十六烷中的CO2扩散

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摘要

A method combining magnetic resonance imaging (MRI) and dual-chamber pressure decay (i.e., the pressure-volume-temperature method) was used to measure the diffusivity of CO2 in bulk n-hexadecane, a representative oil, at 21 degrees C. Images of the proton density of n-hexadecane were obtained by MRI using a high magnetic field and high resolution, and the pressure decay was recorded. Overall diffusion coefficients of CO2 were calculated from both pressure decay and MRI intensity data. The two results showed good agreement. MRI was successfully used to study the diffusivity of CO2 in n-hexadecane. The change of image density (i.e., proton density) demonstrates that the oil density decreases as CO2 diffuses into it. The finite volume method was applied to the images obtained by MRI, allowing the diffusion coefficient of CO2 to be directly obtained. MRI methods can measure the unsteady-state local diffusion coefficient and overall diffusion coefficient of such systems.
机译：结合了磁共振成像（MRI）和双腔压力衰减的方法（即压力-体积-温度方法）用于测量21°C下正丁烷（代表性油）的CO2扩散率。通过使用高磁场和高分辨率的MRI获得正十六烷的质子密度的平均值，并记录压力衰减。从压力衰减和MRI强度数据计算出CO2的总扩散系数。两项结果显示出良好的一致性。 MRI已成功用于研究CO在正十六烷中的扩散率。图像密度（即质子密度）的变化表明，随着CO 2扩散到其中，油的密度降低。将有限体积方法应用于通过MRI获得的图像，从而可以直接获得CO2的扩散系数。 MRI方法可以测量此类系统的非稳态局部扩散系数和整体扩散系数。

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