Consultez les proceedings de la Conference COMSOL 2024
为了探究新型环保气体中流注的产生机理和发展过程，为局部放电的光学检测和可靠诊断提供理论基础，通过 COMSOL 仿真直流电压下 C4F7N/CO2 混合气体中针板模型一次流注到 二次流注的放电过程，将电子和离子的产生与运动通过连续性方程进行表示，获得流注发展过程中电场的变化规律和光通量的密度分布。仿真结果表明，当一次流注头部靠近阴极时，光通量将呈指数增长；随后空间电荷将迅速地重新分配，阴极处的电子将通过流注通道进入阳极，一次流注的等离子体鞘层被破坏，流注体内部的电场上升；随着通道的导电性降低，电荷重新分配结束，二次流注开始向阴极发展。二次流注与一次流注相比 ... En savoir plus
Increased concentrations of greenhouse gases in the atmosphere are known to be the main cause of global warming. Among the various decarbonisation strategies proposed, geological storage of CO2 is one of the most interesting options for reducing net carbon emissions to the atmosphere. ... En savoir plus
With the anticipated effects of global climate change upon us, induced by egregious CO2 emissions, it is imperative to implement technologies to close the carbon cycle. One potential technique to do this is storing the energy from intermittent sources (e.g. solar, wind, hydro) in the ... En savoir plus
Electrochemical reduction of CO2 to value added chemicals is a promising strategy to mitigate its emission from atmosphere and close the carbon cycle. Although the knowledge on designing electrocatalysts for CO2 electroreduction exists, challenges are associated with developing CO2 ... En savoir plus
The storage of CO2 in the sub-surface is seen as a technology that can contribute to the generally accepted goal of a de-carbonized society. As real field experiments are hardly feasible, many current studies utilize the capabilities of numerical modelling. Concerning the practical ... En savoir plus
The current general context for green production and decarbonation prompts considering alternative solutions to produce high added value byproducts from gas decomposition without producing CO2. Steam Reforming or Combustion processes, widely applied in Industry, need H2O or O2 to ... En savoir plus
In the context of climate change mitigation, hydrogen represents a promising and versatile energy vector. Water electrolysis powered by renewable energy offers a sustainable method for hydrogen production, with efficiency gains achievable at the higher operating temperatures of Solid ... En savoir plus
Problem set up: The present study models fluid flow (CO2) in a closed system in context to CO2 sequestration in deep saline aquifers using the Sub surface flow module. A 2 dimensional heterogeneous porous reservoir (Fig. 1) 300 m x 910 m was fabricated using COMSOL Multiphysics® ... En savoir plus
Model calibration and validation were implemented using experimental data from literature. We utilized a microfluidic electrochemical cell that was configured with parallel, rectangular, and multi-layered channels, which is operating in a co-flow mode. CO2 gas stream enters the cathode ... En savoir plus
A model for CO2 storage is presented. It is shown that the system is highly dynamic, i.e. results depend strongly on parameter disturbances and numerical features. However, a series of scenario calculations shows that there are invariants, most important: the duration of the early ... En savoir plus