Pore-scale study of effects of preferential path on multiphase reactive transport process in porous media

doi:10.11949/0438-1157.20240809

Abstract

Abstract:

The multiple coupled reactive transport process of multiphase flow-solute transport-chemical reaction-solid phase evolution in porous media is crucial for many scientific and engineering problems. In this paper, a pore-scale multiphase reactive transport model is established to study the influence of preferential path on the multiphase reactive transport process in porous media. The results show that compared with the single-phase reaction transport process, where the wormhole extends along the preferential path, the presence of two-phase flow changes the mass transfer path. When the non-reactive fluid increases, the preferential path is blocked by the non-reactive fluid and the transverse mass transfer is limited, resulting in the absence of wormhole dissolution, and the delay of solid dissolution breakthrough. In addition, the existence of the two-phase stream will reduce the length of the reaction interface, and the average reactant concentration will increase significantly after dissolving breakthroughs.

Key words: multiphase reaction, transport processes, porous media, solid dissolution, lattice Boltzmann method

摘要：

多孔介质中多相流-溶质输运-化学反应-固相演变的多场耦合反应输运过程对于许多科学和工程问题至关重要。建立孔隙尺度多相反应输运模型，研究了优势通道对多孔介质中多相反应输运过程的影响。结果表明，相比于单相反应输运过程形成沿优势通道扩展的虫洞，两相流的存在会改变传质路径，当非反应流体增多时，会封堵优势通道，抑制横向传质，导致虫洞溶解消失，固体溶解突破延后。此外，两相流的存在会使可供反应界面长度减小，平均反应物浓度在溶解突破后显著增大。

关键词: 多相反应, 传递过程, 多孔介质, 固体溶解, 格子Boltzmann方法

CLC Number:

TK 121

Chuangde ZHANG, Li CHEN. Pore-scale study of effects of preferential path on multiphase reactive transport process in porous media[J]. CIESC Journal, 2025, 76(1): 161-172.

张闯德, 陈黎. 优势通道对多孔介质中多相反应输运过程影响的孔隙尺度研究[J]. 化工学报, 2025, 76(1): 161-172.

Figures/Tables 11

Fig.1 Schematic of multiphase reactive transport computational domain

Table 1 Physical property parameters used in the simulation

参数	符号	物理单位值	格子单位值
颗粒直径	D	500 μm	50
流体A密度	ρ_A	1000 kg·m^-3	2.0
盐水的运动黏度	μ_A	1.0×10^-6 m²·s^-1	0.167
反应物在盐水中的扩散系数	D_R	7.2×10^-7 m²·s^-1	0.12
生成物在盐水中的扩散系数	D_P	7.2×10^-7 m²·s^-1	0.12
摩尔体积	V_m	3.8×10^-5 m³·mol^-1	3.8×10^-2
平衡常数	K_eq	1×10¹⁰	1×10¹⁰
流体A中的入口反应物浓度	C_R,in	1.0 mol·L^-1	1.0
流体A和B的入口产品浓度	C_P,in	0 mol·L^-1	0
Péclet数	Pe	5	5
Damköhler数	Da	10	10

Fig.2 Multiphase reactive transport processes in single-grain structure

Fig.3 Effect of flow rate ratio on fluid distribution and pore structure evolution during reactive transport processes

Fig.4 Effect of flow rate ratio on reactant concentration distribution during reactive transport processes

Fig.5 Comparison of mean migration velocity of concentration mass center between single-phase and multiphase reaction transport processes

Fig.6 Effects of flow rate ratio on injected pore volumes required for breakthrough

Fig.7 Effects of flow rate ratio on evolutions of normalized porosity and reactive fluid saturation

Fig.8 Effects of flow rate ratio on interfacial length

Fig.9 Effects of flow rate ratio on evolutions of mean reactant concentration

Fig. 10 Effects of flow rate ratio on evolutions of effective reaction rate

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