Soil aeration processes and status are reviewed with regard to different soil, climatic, land-use, and crop types and with regard to diffusive and advective flow mechanisms. Factors affecting aeration status and its quantifiers are discussed and active soil aeration (“oxygation”) practices are presented. Movement of O2 from the soil surface into the soil profile and its transport into soil aggregates and toward plant roots is mainly diffusive. In most circumstances, root respiration is constrained by vertical O2 diffusion from the atmosphere to the root zone and by the diffusive resistance of the mucilage layer. Several O2–diffusive flow models are proposed and discussed with regard to the different geometries, relevant length scales, boundary conditions, and sinks. Soil aeration by advective O2 flow, driven by barometric pressure changes, may also be significant in dry, coarse-textured soils with no underlying impermeable layers. Respiration in the soil consists mainly of plant root and microbial O2 uptake, which are roughly of the same magnitude and strongly correlated through symbiotic and competitive relationships. The bulk, areal soil respiration rate varies from several to tens of grams of O2 per square meter per day depending on soil cover: fallow, pasture, forests, unirrigated and irrigated, cropped fields, and orchards (in general increasing order). Soil respiration rate is also affected by climatic conditions, where a temperature difference of 10°C increases O2 consumption (and CO2 production) twoto threefold. The ratio between emitted CO2 and inspired O2 (respiratory quotient) is not unity (on a molar basis) but rather depends on the types of respiring populations and environmental conditions. Reduced O2 and elevated CO2 concentrations negatively affect plant growth and productivity. These conditions are correlated mostly with wet and warm soils, such as intensively irrigated fields with fine-textured soils (high water retention) during the summer. Oxygen-availability quantifiers such as O2 concentration, air content, and O2 diffusion rate are superior to other quantifiers such as soil properties (e.g., soil texture, porosity) and redox potential. In the last few decades, several active aeration methods have been proposed and evaluated, such as adding air or O2 bubbles or H2O2 to the irrigation water and air injection into the soil. Although these methods have given mainly positive results, none is widely used in agricultural practice, due mainly to a lack of profitability potential, field-scale proof demonstration, and a coherent protocol for field application.

Review and Evaluation of Root Respiration and of Natural and Agricultural Processes of Soil Aeration

Comprehensive review of carbonated water injection for enhanced oil recovery

Micromodel investigations of CO2 exsolution from carbonated water in sedimentary rocks

Multi-scale experimental study of carbonated water injection: An effective process for mobilization and recovery of trapped oil

Interphase mass transfer between fluids in subsurface formations: A review

Gas exsolution and flow during supersaturated water injection in porous media: II. Column experiments and continuum modeling

High-pressure die casting is a manufacturing process in which near-net-shape components are produced rapidly under a pressurized environment. However, due to the relatively higher cooling rate prevailing during the process, isolated liquid pockets form at certain locations, leading to increased porosity formation. A one-dimensional deformable grid numerical model has been developed for predicting the evolution of a single pore in an elementary volume, which combines the diffusion model with the shrinkage affected growth. The model accounts for the change in pore size due to shrinkage and inter-granular growth. This model can provide predictions in representative volumes and be used for component level predictions by combining with a macroscopic model.

Numerical modelling of porosity with combined gas and shrinkage effects in HPDC

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Gas exsolution and flow during supersaturated water injection in porous media: II. Column experiments and continuum modeling

Numerical modelling of porosity with combined gas and shrinkage effects in HPDC