Transport in Porous Media最新文献_第3页

Stability of the Cattaneo–Christov–Jordan–Mariano Model for Thermal Convection in Porous Media 多孔介质热对流Cattaneo-Christov-Jordan-Mariano模型的稳定性

IF 2.6 3区工程技术

Transport in Porous Media Pub Date : 2026-02-18 DOI: 10.1007/s11242-026-02296-3

Amit Mahajan, Sonali Dagar

{"title":"Stability of the Cattaneo–Christov–Jordan–Mariano Model for Thermal Convection in Porous Media","authors":"Amit Mahajan, Sonali Dagar","doi":"10.1007/s11242-026-02296-3","DOIUrl":"10.1007/s11242-026-02296-3","url":null,"abstract":"<div><p>This study investigates the problem of thermal convection in a porous medium saturated with fluid, governed by extended Darcy’s law and analyzed within the framework of the Cattaneo–Christov–Jordan–Mariano (CCJM) model. The CCJM framework extends Fourier’s law by incorporating finite thermal relaxation, thermal diffusion, and inertial effects, thereby providing a more realistic description of heat transfer in porous systems. A combined linear (stationary and oscillatory) and nonlinear stability analysis is employed to determine the onset of convection. Linear instability, developed through normal mode decomposition, provides the critical Rayleigh number and wavenumber marking the instability threshold, while nonlinear stability, based on the energy method, evaluates finite-amplitude disturbances and identifies subcritical regimes. This work investigates the effects of three dimensionless parameters: the thermal diffusion (Mariano) parameter <span>(zeta )</span>, which characterizes the diffusion of heat flux, the Vadasz number <i>Va</i>, which represents inertial effects in porous media, and the Straughan number <i>Sg</i>, which accounts for thermal relaxation. All critical thresholds are computed numerically, and the results demonstrate that increasing <span>(zeta )</span> generally stabilizes the system by postponing the onset of convection, whereas inertial and thermal relaxation effects can destabilize the flow by promoting oscillatory modes and triggering convection at lower Rayleigh numbers. These findings provide new insights into thermal convection in porous media by establishing a stricter stability criterion and clarifying how material parameters control the onset of convection, thereby deepening our understanding of thermal stability within the Cattaneo–Christov–Jordan–Mariano (CCJM) model.</p></div>","PeriodicalId":804,"journal":{"name":"Transport in Porous Media","volume":"153 3","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147340090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical Investigation of Fluid Flow Through Glass Sphere Packed Bed Representative of High-Porosity Permeable Concrete 以高孔隙率透水混凝土为代表的玻璃球填充床流体流动数值研究。

IF 2.6 3区工程技术

Transport in Porous Media Pub Date : 2026-02-12 DOI: 10.1007/s11242-026-02294-5

Mahmoud Abbaszadeh, Marios Christou, Alalea Kia

{"title":"Numerical Investigation of Fluid Flow Through Glass Sphere Packed Bed Representative of High-Porosity Permeable Concrete","authors":"Mahmoud Abbaszadeh, Marios Christou, Alalea Kia","doi":"10.1007/s11242-026-02294-5","DOIUrl":"10.1007/s11242-026-02294-5","url":null,"abstract":"<div><p>Permeable concrete allows rapid drainage of stormwater through otherwise impermeable infrastructure. Modelling the hydraulic performance of permeable concrete is challenging due to its tortuous pore structure. In this study a robust numerical model, validated against experimental results, is developed for permeable concrete structures at higher porosity using glass spheres (GS) of different diameters. Monosized GS along with polysized combinations are used to represent an idealised permeable concrete structure. The effect of the pore characteristics, including porosity and mean pore size, along with the hydraulic gradient (HG) on permeability and hydraulic tortuosity is determined. Discrete element method and computational fluid dynamics (CFD) are both used to generate the GS and simulate water flow through the packed bed, respectively. Permeability measurements are conducted using both falling head (FH) and constant head methods. The results demonstrate a strong agreement between the FH permeability values obtained through the resolved CFD simulations and the experimental data, without requiring any calibration of the CFD model. In summary, the present study offers a high-resolution, experimentally validated and physics-based approach to understanding the permeability and tortuosity of permeable concretes modelled as packed sphere beds. It eliminates reliance on empirical adjustments, provides new insights into the effect of the different HG and establishes a generalised permeability correlation applicable to a wide range of scenarios.</p></div>","PeriodicalId":804,"journal":{"name":"Transport in Porous Media","volume":"153 3","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12901290/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146199814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Darcy–Bénard Convection in the Presence of Feedback Control and Temperature Modulation 反馈控制和温度调制下的达西-巴姆纳德对流

IF 2.6 3区工程技术

Transport in Porous Media Pub Date : 2026-02-12 DOI: 10.1007/s11242-026-02293-6

Vinit Vinod Revankar, M. S. Jagadeesh Kumar

引用次数: 0

Adaptive Time-Stepping and Machine Learning Approach for Pore-Scale Reactive Transport Simulations 孔隙尺度反应输运模拟的自适应时间步进和机器学习方法

IF 2.6 3区工程技术

Transport in Porous Media Pub Date : 2026-02-12 DOI: 10.1007/s11242-026-02287-4

Micha P. Baur, Sergey V. Churakov, Nikolaos I. Prasianakis

{"title":"Adaptive Time-Stepping and Machine Learning Approach for Pore-Scale Reactive Transport Simulations","authors":"Micha P. Baur, Sergey V. Churakov, Nikolaos I. Prasianakis","doi":"10.1007/s11242-026-02287-4","DOIUrl":"10.1007/s11242-026-02287-4","url":null,"abstract":"<div><p>Pore-scale reactive transport simulations are typically computationally very expensive, which limits their application to complex heterogeneous systems. To solve the computational bottleneck, an adaptive time-stepping algorithm is developed and combined with machine learning-derived surrogate models for geochemical calculations. The time-step is adapted by monitoring the evolution of the diffusion field and the precipitation reactions and by exploiting intermediate stationary states of the system. The algorithm is benchmarked on a system relevant to cement–claystone interaction with the geochemical reaction being the precipitation of Calcium-Silicate-Hydrates (C-S-H) in the pore space of a claystone. The precipitation of C-S-H is modeled as a solid solution, and it is possible to calculate and trace the local Ca/Si ratio of C-S-H, as well as the local amount of gel porosity. In the reactive transport simulations presented here, the geochemical surrogate models alone lead to acceleration factors of up to two orders of magnitude. The adaptive time-stepping algorithm leads to an additional acceleration of three to five orders of magnitude maintaining the relative deviation below 2%. The overall combined acceleration is demonstrated to be six to seven orders of magnitude having a profound impact and opening new computational avenues.</p></div>","PeriodicalId":804,"journal":{"name":"Transport in Porous Media","volume":"153 3","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147338591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Penetrative Electrothermal Convection in Anisotropic Porous Media: Role of Velocity and Thermal Boundary Conditions 各向异性多孔介质中的渗透电热对流：速度和热边界条件的作用

IF 2.6 3区工程技术

Transport in Porous Media Pub Date : 2026-02-01 DOI: 10.1007/s11242-026-02286-5

B. Arpitha Raju, C. E. Nanjundappa, I. S. Shivakumara

{"title":"Penetrative Electrothermal Convection in Anisotropic Porous Media: Role of Velocity and Thermal Boundary Conditions","authors":"B. Arpitha Raju, C. E. Nanjundappa, I. S. Shivakumara","doi":"10.1007/s11242-026-02286-5","DOIUrl":"10.1007/s11242-026-02286-5","url":null,"abstract":"<div><p>This study examines penetrative electrothermal convection driven by uniform internal heat generation in a horizontal layer of dielectric fluid-saturated anisotropic Brinkman porous medium subjected to a uniform AC electric field. Anisotropy in permeability and thermal diffusivity is incorporated, with the vertical permeability fixed at twice the horizontal value, while the thermal anisotropy parameter is varied. The boundaries are taken to be either rigid or stress-free, with an adiabatic lower surface and an upper surface subject to a Robin thermal condition. A linear stability analysis yields a generalized eigenvalue problem, which is solved numerically using a Galerkin method. The principle of exchange of stabilities is shown to hold for rigid–rigid, rigid–free and free–free boundary combinations. Increasing the AC electric Rayleigh number and the Darcy number advances the onset of convection, whereas larger thermal anisotropy and Biot numbers delay instability. Velocity boundary conditions exert a significant quantitative influence, with rigid boundaries being the most stabilizing. As a limiting case, pure electroconvection in the absence of buoyancy is also considered. Although the qualitative trends remain similar to those in the coupled electrothermal regime, substantially higher critical AC electric Rayleigh numbers and wavenumbers are required to trigger instability, reflecting the need for electric forcing alone to overcome viscous and porous dissipation.</p></div>","PeriodicalId":804,"journal":{"name":"Transport in Porous Media","volume":"153 3","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146090860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On the Stability of Triple-Diffusive Convection in a Voigt Fluid-Saturated Darcy–Brinkman Porous Medium Voigt流体饱和Darcy-Brinkman多孔介质中三扩散对流的稳定性

IF 2.6 3区工程技术

Transport in Porous Media Pub Date : 2026-02-01 DOI: 10.1007/s11242-026-02289-2

K. R. Raghunatha, Sangamesh, C. Pragathi, I. S. Shivakumara

{"title":"On the Stability of Triple-Diffusive Convection in a Voigt Fluid-Saturated Darcy–Brinkman Porous Medium","authors":"K. R. Raghunatha,  Sangamesh, C. Pragathi, I. S. Shivakumara","doi":"10.1007/s11242-026-02289-2","DOIUrl":"10.1007/s11242-026-02289-2","url":null,"abstract":"<div><p>The linear and weakly nonlinear instability of triple-diffusive convection in a Darcy–Brinkman porous layer saturated with a Navier–Stokes–Voigt fluid is investigated analytically. The instability is driven by competing thermal and solutal buoyancy forces in the presence of viscoelastic stresses arising from a Voigt-type strain-rate regularization. Linear instability analysis reveals that the Kelvin–Voigt parameter plays a decisive role in oscillatory convection, exerting either stabilizing or destabilizing effects depending on the solute Darcy–Rayleigh number. A distinctive feature of the system is the emergence, under certain parametric conditions, of a disconnected closed oscillatory instability branch separate from the stationary one. In this regime, the neutral stability boundary is defined by three distinct thermal Darcy–Rayleigh numbers, in sharp contrast to the single threshold that characterizes the corresponding double-diffusive system. A weakly nonlinear stability analysis yields a cubic complex Landau amplitude equation governing the evolution of the disturbance amplitude, suggesting the possibility of subcritical bifurcations under certain parametric conditions. Heat and mass transport are quantified using time- and area-averaged Nusselt and Sherwood numbers, which increase with the Darcy–Prandtl number but decrease with increasing Darcy number and the effective heat capacity group, while variations in the Kelvin–Voigt parameter induce crossover behavior in the transport characteristics. These results clarify the subtle interplay between buoyancy, diffusion, and viscoelastic effects in regulating convection in triply diffusive porous media.</p></div>","PeriodicalId":804,"journal":{"name":"Transport in Porous Media","volume":"153 3","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146090929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Time-Resolved X-ray and Neutron Imaging of Brine Percolation and Liquefaction in an Ultra-Soft Sandstone 超软砂岩卤水渗流和液化的时间分辨x射线和中子成像

IF 2.6 3区工程技术

Transport in Porous Media Pub Date : 2026-02-01 DOI: 10.1007/s11242-025-02284-z

Fazel Mirzaei, Mukul Jaiswal, Jessica Ann Zeman, Kim Robert Tekseth, Benoît Cordonnier, Nicolaine Agofack, Pierre Cerasi, François Renard, Basab Chattopadhyay, Dag Werner Breiby

{"title":"Time-Resolved X-ray and Neutron Imaging of Brine Percolation and Liquefaction in an Ultra-Soft Sandstone","authors":"Fazel Mirzaei, Mukul Jaiswal, Jessica Ann Zeman, Kim Robert Tekseth, Benoît Cordonnier, Nicolaine Agofack, Pierre Cerasi, François Renard, Basab Chattopadhyay, Dag Werner Breiby","doi":"10.1007/s11242-025-02284-z","DOIUrl":"10.1007/s11242-025-02284-z","url":null,"abstract":"<div><p>The inherent instability and risk of liquefaction associated with unstable glaciomarine clay are both scientifically intriguing and societally important. Stabilizing sensitive soils is increasingly necessary with the unfolding climate crisis, which leads to wilder and wetter weather. The relevant length scales extend from nanometer-sized pores to kilometer-sized geological features. Laboratory experiments are important for gaining a better understanding of these phenomena. Here, we present a study of the ultra-soft sandstone <i>Saltwash South</i>, which essentially consists of quartz particles glued together by clay, as a proxy for nanoscopically fine-grained sensitive soil to facilitate time-resolved imaging of the onset of activation and liquefaction. By employing in situ time-resolved combined X-ray and neutron computed tomography (CT), we visualize the structural deformation caused by the presence of water and salts. While neutron imaging was sensitive to the presence of normal and heavy water, simultaneous X-ray imaging was used to measure the porous structure, swelling, and initial liquefaction response of the consolidated rock. Uniform expansion was observed in regions exposed to water, reflecting clay swelling and disaggregation. In tightly confined samples, the swelling and disaggregation were suppressed. Finally, we discuss future perspectives of this promising approach to studying liquefaction phenomena in porous media.</p></div>","PeriodicalId":804,"journal":{"name":"Transport in Porous Media","volume":"153 3","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11242-025-02284-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146090959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

SLM-Fabricated CuCrZr TPMS Heat Exchangers: Influence of Structural Design on Fluid Transport Characteristics slm制造CuCrZr TPMS换热器：结构设计对流体输运特性的影响

IF 2.6 3区工程技术

Transport in Porous Media Pub Date : 2026-02-01 DOI: 10.1007/s11242-026-02288-3

Xiaoqing Yang, Yaqin Yang, Chao Suo, Bin Liu, Xueli Chen, Zezhou Kuai, Yaoxian Zhang, Yuan Gao, Zhonghua Li, Rui Wang

{"title":"SLM-Fabricated CuCrZr TPMS Heat Exchangers: Influence of Structural Design on Fluid Transport Characteristics","authors":"Xiaoqing Yang, Yaqin Yang, Chao Suo, Bin Liu, Xueli Chen, Zezhou Kuai, Yaoxian Zhang, Yuan Gao, Zhonghua Li, Rui Wang","doi":"10.1007/s11242-026-02288-3","DOIUrl":"10.1007/s11242-026-02288-3","url":null,"abstract":"<div><p>The hydrodynamic performance of porous structures is paramount for the efficiency of compact heat exchangers. This study investigates the fluid transport characteristics of three types of triply periodic minimal surface (TPMS) structures (Diamond, Primitive, and IWP) fabricated from CuCrZr alloy via selective laser melting (SLM). Combining computational fluid dynamics (CFD) simulations with experimental validation, we systematically elucidate the influence of structure and unit cell density on key performance metrics, including pressure drop, friction factor, and permeability. Results reveal that the Diamond structure, with the lowest inlet porosity (23.07%), exhibits the most complex flow patterns—characterized by significant flow separation, enhanced vorticity, and superior flow uniformity—leading to the highest pressure drop and friction factor, but the lowest permeability. In contrast, the primitive and IWP structures, with higher inlet porosities (46.34% and 50.07%, respectively), offer lower flow resistance. Furthermore, increasing the unit cell count for a fixed overall porosity amplifies these effects, resulting in a higher pressure drop per unit length and reduced permeability due to more frequent flow disturbances. The experimental measurements of pressure drop align well with numerical predictions, with discrepancies attributed to a reduction in effective functional porosity caused by adherent unmelted particles during the SLM process. This work provides fundamental insights into the structure-transport relationships in TPMS architectures and offers practical guidelines for designing high-performance heat exchangers for applications under extreme conditions, such as deep-sea thermal management.</p></div>","PeriodicalId":804,"journal":{"name":"Transport in Porous Media","volume":"153 3","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146090930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Stability of Double-diffusive Mixed Convection in a Vertical Pipe Filled by Porous Medium 多孔介质垂直管内双扩散混合对流的稳定性

IF 2.6 3区工程技术

Transport in Porous Media Pub Date : 2026-02-01 DOI: 10.1007/s11242-025-02276-z

Saurabh Kapoor, Durgaprasad Nayak

{"title":"Stability of Double-diffusive Mixed Convection in a Vertical Pipe Filled by Porous Medium","authors":"Saurabh Kapoor, Durgaprasad Nayak","doi":"10.1007/s11242-025-02276-z","DOIUrl":"10.1007/s11242-025-02276-z","url":null,"abstract":"<div><p>Thermal gradients in many natural environments, such as undersea hot springs and hydrothermal vents, are often accompanied by variations in the concentration of chemical compounds carried into the surrounding seawater. This interaction gives rise to a phenomenon known as thermosolutal mixed convection. To investigate the underlying physical mechanisms in such systems, a vertical pipe filled with saline water through a porous medium is considered. The non-Darcy Brinkman–Forchheimer extended model is employed, assuming that the saturated porous medium is in a thermal equilibrium state. The instability boundary curve reveals three distinct regimes: (i) the Rayleigh–Taylor (R–T) phenomenon, (ii) a nonlinear variation of mixed convection on a log–log scale and (iii) a linear variation on a log–log scale in the pipe. These regimes occur at specific Reynolds numbers. The instability mechanism of the base flow is examined using the spectral collocation technique. The present study focuses on the instability of a dense porous medium, where the Darcy–Forchheimer drag is incorporated in the momentum equation. A linear stability analysis is performed for a wide range of Darcy numbers (<span>(10^{-8})</span> to <span>(10^{-5})</span>). Similar to cross-diffusive free convection in a vertical slot, a relationship is observed between the solutal Rayleigh number (<span>(Ra_S)</span>) and the thermal Rayleigh number (<span>(Ra_T)</span>). A hyperbolic relationship between the threshold values of <span>(Ra_S)</span> and <i>Da</i> is found at <span>(Re = 1000)</span> for the upper limit of <span>(Ra_S)</span> in the first regime, expressed as <span>(Ra_S)</span> <i>Da</i> =4.9 x <span>(10^{-4})</span>. Simulations of secondary flow profiles are also presented at the critical state for all three regimes.</p></div>","PeriodicalId":804,"journal":{"name":"Transport in Porous Media","volume":"153 3","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11242-025-02276-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146090931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of Near-surface Winds and Soil Pore Air Pressure Fluctuations on Intra-soil Gas Transport Mechanisms 近地面风和土壤孔隙气压波动对土壤内气体输送机制的影响

IF 2.6 3区工程技术

Transport in Porous Media Pub Date : 2026-02-01 DOI: 10.1007/s11242-026-02292-7

Junguo Hu, Taolve Chen, Lingxia Feng, Junjie Jiang, Chao Zhu, Wei Jiang

{"title":"Effects of Near-surface Winds and Soil Pore Air Pressure Fluctuations on Intra-soil Gas Transport Mechanisms","authors":"Junguo Hu, Taolve Chen, Lingxia Feng, Junjie Jiang, Chao Zhu, Wei Jiang","doi":"10.1007/s11242-026-02292-7","DOIUrl":"10.1007/s11242-026-02292-7","url":null,"abstract":"<div><p>Soil carbon flux is the main source of atmospheric CO<sub>2</sub>. An accurate understanding of the soil CO<sub>2</sub> transport process is of substantial significance for the study of global carbon flux and the prediction of future climate change. In this study, data on CO<sub>2</sub> concentrations over time in five media under the influence of surface winds and pore air pressure fluctuations were analysed using (1) an analytical solution of the dispersive transport model and (2) a numerical solution of the advection transport model to accurately delineate the transport mechanisms that control soil gas transport. For loam and sandy soils, gas transport is mainly dominated by diffusion, and in highly permeable sand, gas transport changes from diffusion–dispersion transport to advection transport dominated by wind speed and pore air pressure fluctuations. The effects of surface wind and pore pressure fluctuations on advection velocity differed with depth. The pore pressure fluctuations had a stronger penetrating power. The ratio of the enhanced diffusion coefficient (<i>D</i><sub><i>e</i></sub>) to advection velocity(<i>v</i>) was effective in determining the transport mechanism driving gas transport within the medium, which is conducive to accurately modelling the release of CO<sub>2</sub> from soils to improve the understanding and assessment of the global carbon cycle.</p></div>","PeriodicalId":804,"journal":{"name":"Transport in Porous Media","volume":"153 3","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146090960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0