Articles techniques et présentations

The DOE BETO consortium "ChemCatBio" has developed a packed bed catalyst for use in a Catalytic Fast Pyrolysis (CFP) process for producing biofuels and chemicals from lignocellulosic biomass. Another BETO consortium known as "CCPC"  (Consortium for Computational Physics and Chemistry) is ... En savoir plus

Steam drums of a nuclear power plant separate steam from the steam water mixture and sub cooled incoming feed water returns to the reactor. The entire feed water flow is delivered to the steam drum through the feed water sparger. The feed water sparger is provided with number of ... En savoir plus

叶片复合材料层的击穿是风电机组遭受雷击后的主要故障形式。对于低电导率的GFRP类叶片铺层而言，雷电先导作用下的强背景电场造成的电击穿可能先于回击电弧的热效应产生。为了获得GFRP铺层的电击穿机理，基于COSMOL Multiphysics软件，建立了引下线-GFRP铺层的流注放电数值仿真模型。考虑了空气域与介质层内部的粒子输运，以及气-固分界面上的电荷沉积与注入作用。通过“稀物质传递物理场” 模块、“静电物理场”模块、“边界常微分和微分代数” 模块以及“稳定对流-扩散方程接口” 模块对控制方程进行求解。依据电场梯度分布进行了网格加密与时间步设置 ... En savoir plus

This paper intends to show a model of a monolithic reactor for the autothermal reforming process (ATR), a process that uses hydrocarbons to produce H2. The ATR chemical reactions take place on the surface of monolith channels coated with a catalyst. The isothermal ATR reactor is modeled ... En savoir plus

Electrochemistry is inherent a surface process, requiring the transport of reagents towards the electrode surface. In electrochemical reactors this typically results in mass transfer limitation problems, limiting the yield and efficiency of the reactor. While the academic community is ... En savoir plus

Magnesium hydride (MgH2) has been one of the most promising hydrogen storage methods that can be applied to commercial hydrogen energy systems due to magnesium’s safety, low cost, and excellent storage capacity for hydrogen, compared to other reversible metal hydrides. But hydrogen ... En savoir plus

At Oak Ridge National Laboratory (ORNL), the COMSOL Multiphysics software has become a reliable and important resource to estimate and assess thermal safety margins for several nuclear applications. This poster presentation will highlight some of the ongoing activities in the following ... En savoir plus

Design of the Pressurized Water Reactors (PWRs) involves extensive calculations to verify the reactor safety criteria such as power peaking factor during the reactor lifetime. Coupling of neutronic calculations, thermal hydraulic calculations and other reactor phenomena requires a ... En savoir plus

A power supply is generally used in many electrical devices. In order to deliver uniform power irrespective of time variation, most plasma equipment also uses a power source. Therefore, the power condition in plasma simulations is essential. In time-dependent models using a current ... 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