Results 51 to 60 of about 93,113 (262)

Investigation of Water and Heat Transfer Mechanism in PEMFCs Based on a Two-Phase Non-Isothermal Model

Energies, 2023
In a proton exchange membrane fuel cell (PEMFC) system, proper management of water and heat transport is essential to improve its overall performance and durability.
Dapeng Gong, Sichuan Xu, Yuan Gao
doaj   +1 more source

Formation of the diffusion layer in gas boring

IOP Conference Series: Materials Science and Engineering, 2018
© Published under licence by IOP Publishing Ltd. Boriding in powder media is successfully used to increase the life of parts. To increase the depth of the diffusion layer and improve its properties, a method for activating the surface of a saturable part by means of electromechanical processing is proposed. The results on the structure of the resulting
Ilyin V., Sabitov L., Khaibullina A., Ilyin O.   +3 more
openaire   +2 more sources

Impact of MgO Additions on the Oxidation Resistance and Compression Behavior of Vanadium Alloys

Advanced Engineering Materials, EarlyView.
An increase in oxidation resistance at 600 °C is achieved for alloys containing more than 2.5 wt.% MgO. It has been established that, along with V2O5, MgO6V2, and Mg2O7V2 are formed, which are presumed to enhance oxidative stability. Furthermore, the possible transformation of Mg‐vanadates through reaction with CO2, which presumably occurs in this ...
Ievgen Solodkyi, Mathias Galetz, Georg Hasemann, Fabian Lanoy, Emma White, Manja Krüger   +5 more
wiley   +1 more source

Microstructure Modification of Additively Manufactured Mo–9Si–8B by Annealing and Its Effects on High‐Temperature Mechanical Properties

Advanced Engineering Materials, EarlyView.
Postbuild annealing systematically modifies the phase fractions and morphology of EB‐PBF processed Mo–9Si–8B. Quantitative microstructure–property correlations reveal how controlled phase evolution enhances high‐temperature compressive strength and creep resistance.
Christopher Schmidt, Yong Chen, Georg Hasemann, Benjamin Wahlmann, Carolin Körner, Manja Krüger   +5 more
wiley   +1 more source

Modeling and Experimental Researches on Redox Reactions of Iron Ore Oxygen Carriers in Chemical Looping

Engineering Reports
Developing a reliable kinetic model for these redox reactions is crucial for understanding and improving oxygen carriers practical in chemical looping applications.
Wang Hui, Lei Liu, Kexin Li, Di Zhong
doaj   +1 more source

Two-Phase Flow Simulation of Multi-Droplet Motion Relevant for Polymer Electrolyte Fuel Cell Gas Channel Using the Volume of Fluid Approach

Energies
This study develops a 3D computational fluid dynamics model of a polymer electrolyte fuel cell cathode gas channel with seven discrete liquid breakthrough inlets, one gas inlet, and a two-phase outlet.
Dunke Liu, Dieter Froning, Ralf Peters
doaj   +1 more source

Applications of the Atmospheric Transport and Diffusion of LES Modeling to the Spread and Dissipation of COVID-19 Aerosol Particles inside and outside the Japan National Stadium (Tokyo Olympic Stadium)

Modelling and Simulation in Engineering, 2021
In this paper, we use an analysis function for gas diffusion known as the Research Institute for Applied Mechanics, Kyushu University, Computational Prediction of Airflow over Complex Terrain (RIAM-COMPACT), which was developed for complex terrain, in ...
Takanori Uchida, Ryo Araya
doaj   +1 more source

Gas Diffusivity in the Forest Humus Layer

Soil Science, 2019
While several diffusivity models have been developed for mineral soils, there are few data for the forest humus layers that overlie, and are distinct from, the mineral soil. We measured soil gas diffusivity of the organic layer of spruce and beech stands.
Maier, Martin, Lang, Verena
openaire   +2 more sources

Adaptive Foam 3D Printing of Ultralight and Multifunctional Materials

Advanced Engineering Materials, EarlyView.
Adaptive foam 3D printing, enabled by expandable microspheres, imparts cellular structures to thermoplastic and thermosetting polymers, manufactured through a variety of processes including fused filament fabrication, direct ink writing, digital light processing, and inkjet printing.
Nariman Rajabifar, Amir Ameli
wiley   +1 more source

A Transient Model for Fuel Cell Cathode-Water Propagation Behavior inside a Cathode after a Step Potential

Energies, 2010
Most of the voltage losses of proton exchange membrane fuel cells (PEMFC) are due to the sluggish kinetics of oxygen reduction on the cathode and the low oxygen diffusion rate inside the flooded cathode.
Der-Sheng Chan, Kan-Lin Hsueh
doaj   +1 more source