多孔介质内气泡熟化特性孔隙尺度研究

doi:10.16085/j.issn.1000-6613.2021-1831

化工进展 ›› 2022, Vol. 41 ›› Issue (3): 1265-1271.DOI: 10.16085/j.issn.1000-6613.2021-1831

• 二氧化碳的捕集、封存及利用 • 上一篇下一篇

多孔介质内气泡熟化特性孔隙尺度研究

周志毅(), 王进卿(), 王广鑫, 池作和, 翁煜侃

中国计量大学计量测试工程学院，浙江杭州 310018

收稿日期:2021-08-26 修回日期:2021-12-09 出版日期:2022-03-23 发布日期:2022-03-28
通讯作者: 王进卿
作者简介:周志毅（1997—），男，硕士研究生，研究方向为多孔介质气泡行为。E-mail：970565845@qq.com。
基金资助:
浙江省自然科学基金(Q20E060017);国家自然科学基金(52006207)

Study on pore size of bubble maturation characteristics in porous media

ZHOU Zhiyi(), WANG Jinqing(), WANG Guangxin, CHI Zuohe, WENG Yukan

College of Metrology & Measurement Engineering, China Jiliang University, Hangzhou 310018, Zhejiang, China

Received:2021-08-26 Revised:2021-12-09 Online:2022-03-23 Published:2022-03-28
Contact: WANG Jinqing

摘要/Abstract

摘要：

多孔介质内的气泡熟化行为广泛存在于CO₂封存等领域，为探究多孔介质内气泡的熟化特性，本文采用空气作为模拟气体，通过可视化实验和数值计算，对双孔隙和四孔隙气泡熟化过程进行了研究，阐释了多孔介质非均质性对熟化过程的影响规律。结果表明：在双孔隙气体饱和度较小情况下，虽然也发生正向熟化，但是孔隙结构的存在使熟化速率明显低于自由流体情况；四孔隙研究显示多孔介质非均质性对气泡熟化过程影响显著，由于孔隙的几何限制，气泡在某些情况下会发生逆Ostwald熟化，即生长的气泡在充满当前孔隙空间后会停止生长并反向熟化导致尺寸缩小；在非均质多孔介质中，由于熟化作用，气泡有传质到大孔隙区域趋势，导致大孔隙区域富集大气泡，存在泄漏风险，从而影响封存。

关键词: CO₂毛细封存, Ostwald熟化, 非均质多孔介质, 传质, 数值模拟

Abstract:

Ostwald ripening behavior widely exists in bubbles in porous media. In order to explore the ripening characteristics of bubbles in porous media, air was used as the simulation gas to study the ripening process of double porosity and four porosity bubbles through visualization experiment and numerical calculation, and the influence of heterogeneity of porous media on the ripening process was explained. The results showed that although the double porosity gas saturation was small, the forward ripening also occurred. However, due to the existence of pore structure, the ripening rate was obviously lower than that of free fluid. The four porosity study showed that the heterogeneity of porous media had a significant effect on the bubble ripening process. Due to the geometric constraints of pores, the bubble will undergo reverse Ostwald ripening in some cases, that is, the growing bubble will stop growing and reverse ripening after filling the pore space, resulting in the size reduction. In heterogeneous porous media, due to ripening, bubbles tend to transfer to the macropore area, which led to the enrichment of macrobubbles in the macropore area and the risk of leakage, thus affecting the storage.

Key words: CO₂ capillary storage, Ostwald ripening, heterogeneous porous media, mass transfer, numerical simulation

中图分类号:

V211.1

周志毅, 王进卿, 王广鑫, 池作和, 翁煜侃. 多孔介质内气泡熟化特性孔隙尺度研究[J]. 化工进展, 2022, 41(3): 1265-1271.

ZHOU Zhiyi, WANG Jinqing, WANG Guangxin, CHI Zuohe, WENG Yukan. Study on pore size of bubble maturation characteristics in porous media[J]. Chemical Industry and Engineering Progress, 2022, 41(3): 1265-1271.

图/表 9

图1 微流体芯片孔隙结构

图2 实验装置1—气瓶；2—精密调压阀；3—缓冲罐；4—数字压力表；5—显微镜；6—CCD相机；7—计算机；8—微量注射泵；9—注射器；10—硅基微流体芯片；11—恒温台；12—恒温台温度控制仪；13—废液废气尾气处理

图3 气泡边缘圆拟合

图4 双孔隙结构气泡熟化

图5 双孔隙结构气泡熟化过程

图6 气泡曲率半径随时间变化过程

图7 自由流体空间结构气泡熟化过程

图8 四孔隙结构气泡熟化过程

图9 四孔隙结构气泡曲率半径随时间变化

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多孔介质内气泡熟化特性孔隙尺度研究

Study on pore size of bubble maturation characteristics in porous media

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