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120 results on '"Zhan, Zhigang"'

1. Pore-Scale Modeling of Microporous Layer for Proton Exchange Membrane Fuel Cell: Effective Transport Properties

Author

Zhang, Heng, Shao, Xuanyu, Zhan, Zhigang, Sarker, Mrittunjoy, Sui, Pang-Chieh, Chuang, Po-Ya Abel, and Pan, Mu

Subjects
Engineering, Materials Engineering, microporous layer, stochastic numerical method, transport properties, pore scale model, Lattice Boltzmann method, compression strain, Chemical Engineering, Civil Engineering, Environmental Engineering, Chemical engineering, Environmental engineering
Abstract

A microporous layer (MPL) is a transition layer with a porous material structure, located between the gas diffusion layer (GDL) and catalyst layer (CL) in a proton exchange membrane fuel cell (PEMFC). It not only significantly improves electron transfer and heat conduction in membrane electrode assembly, but also effectively manages liquid water transport to enhance the fuel cell performance. The MPL is usually coated on one side of the GDL. The fragile nature of MPL makes it challenging to characterize the effective transport properties using experimental methods. In this study, a stochastic numerical method is implemented to reconstruct the three-dimensional microstructure of an MPL consisting of carbon particles and PTFE. The reliability of the MPL reconstructed model is validated using experimental data. The relationship between the effective transport properties and the compression strain is obtained using the Pore Scale Model (PSM), while the relationship between the liquid water saturation and capillary pressure is solved by Lattice Boltzmann Method (LBM). The effective transport properties in the MPL are then imported into the two-phase flow fuel cell model. It is found that the effective transport parameters in MPL obtained by PSM and LBM can improve the accuracy of the model calculation. This study provides an effective method to reconstruct the microstructure of MPL that can generate precise MPL transport parameters for utilization in various PEMFC performance prediction models.

Published
2023

11. Modeling branching effects on source-sink relationships of the cotton plant

Author

Li, Dong, Letort, Véronique, Guo, Yan, De Reffye, P., and Zhan, Zhigang

Subjects
Mathematics - Dynamical Systems, Quantitative Biology - Tissues and Organs
Abstract

Compared with classical process-based models, the functional-structural plant models provide more efficient tools to explore the impact of changes in plant structures on plant functioning. In this paper we investigated the effects of branches on the sourcesink interaction for the cotton plant (Gossypium hirsutum L.) based on a two-treatment experiment conducted on cotton grown in the field: the singlestem plants and the plants with only two vegetative branches. It was observed that the branched cotton had more organs for the whole plant but the organs on the trunk were smaller than those on the single-stem cotton. The phytomer production of the branches was four or five growth cycles delayed compared with the main stem. The organs on the trunk had similar dynamics of expansion for both treatments. Effects of branches were evaluated by using the functionalstructural model GREENLAB. It allowed estimating the coefficients of sink strength to differentiate the biomass acquisition abilities of organs between different physiological ages. We found that the presence of the two vegetative branches increased the ground projection area of plant leaves and had led to slight changes on the directly measured parameters; the potential relative sink strengths of organs were found similar for the two treatments.

Published
2010

16. Study on Self-Humidification in PEMFC with Crossed Flow Channels and an Ultra-Thin Membrane.

Author

Wang, Chenlong, Chen, Xiaosong, Xiang, Xin, Zhang, Heng, Huang, Zhiping, Huang, Xinhao, and Zhan, Zhigang

Subjects
CHANNEL flow, PROTON exchange membrane fuel cells, ELECTRODIALYSIS, WATER distribution, RIVER channels
Abstract

In this study, a 3D model of a proton exchange membrane fuel cell (PEMFC) with crossed channels and an ultra-thin membrane is developed to investigate the feasibility of self-humidification; experiments utilizing a PEMFC stack with identical configurations are conducted to validate the simulation results and further investigate the effects of various operating conditions (OCs) on self-humidification. The results indicate that the crossed flow channel leads to enhanced uniformity of water distribution, resulting in improved cell performance under low/no humidification conditions. External humidifiers for the anode can be removed since the performance difference is negligible (≤3%) between RHa = 0% and 100%. Self-humidification can be achieved in the stack at 90 °C or below with an appropriate back pressure among 100–200 kPa. As the current density increases, there is a gradual convergence and crossing of the voltage at low RH with that at high RH, and the crossover points are observed at 60–80 °C with suitable pressure when successful self-humidification is achieved. Below the current density of the point, the stack's performance is inferior at lower RH due to membrane unsaturation, and conversely, the performance is inferior at higher RH due to flooding; this current density decreases with higher pressure and lower temperature. [ABSTRACT FROM AUTHOR]

Published
2023
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17. Investigation of Ship Vibration Effects on the Gas Distribution and Output Voltage of a Proton Exchange Membrane Fuel Cell

Author

Wen Xiaofei, Qiu Yang, Zhan Zhigang, and Xiao Liusheng

Subjects
General Chemical Engineering, General Chemistry
Abstract

The effects of ship vibrations on the mass transfer and performance of proton exchange membrane fuel cells (PEMFCs) have many vague aspects. Hence, the method of loading ship vibrations with the sliding mesh is first proposed in this paper. Furthermore, this method is adopted to form the solution of the simulation study of PEMFC performance under ship vibrations. In the framework of computational fluid dynamics, the ship vibration is loaded into the three-dimensional PEMFC model and successfully solved. Then, a series of special cases are performed to explore the gas distribution and output features of PEMFCs in ship environments with different vibrations. Finally, the results show that the ship vibrations have vectorial effects on the gas transfer in the PEMFC. Additionally, vibrations perpendicular to the channel evidently affect the gas transfer. Moreover, while the vibrations are parallel to the channel, they remain nearly normal. Relatively, a more significant influence on the output voltage of the PEMFC will occur under smaller frequencies and/or greater amplitudes of ship vibrations.

Published
2022

43. A stochastic, functional-structural model for cotton plants

Author

Li, Dong, Letort, Veronique, Kang, Meng Zhen, Wang, Feng, Guo, Yan, Li, Baoguo, De Reffye, P., Zhan, Zhigang, Key Laboratory of Plant-Soil Interactions - College of Resources and Environmental Sciences (PSI), China Agricultural University (CAU), Mathématiques Appliquées aux Systèmes - EA 4037 (MAS), Ecole Centrale Paris, Eco-informatics (LIAMA), Institut National de la Recherche Agronomique (INRA)-Chinese Academy of Sciences [Changchun Branch] (CAS)-Institut National de Recherche en Informatique et en Automatique (Inria)-Institute of Automation - Chinese Academy of Sciences-Centre National de la Recherche Scientifique (CNRS)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad), Botanique et Modélisation de l'Architecture des Plantes et des Végétations (UMR AMAP), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut de Recherche pour le Développement (IRD [France-Sud]), Theodore DeJong and David Da Silva, Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Chinese Academy of Sciences [Changchun Branch] (CAS)-Institut National de Recherche en Informatique et en Automatique (Inria)-Institute of Automation - Chinese Academy of Sciences-Centre National de la Recherche Scientifique (CNRS), and Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud])

Subjects
U10 - Méthodes mathématiques et statistiques, [SDV]Life Sciences [q-bio], stochastic GREENLAB model, [MATH.MATH-DS]Mathematics [math]/Dynamical Systems [math.DS], Gossypium hirsutum, F50 - Anatomie et morphologie des plantes, F62 - Physiologie végétale : croissance et développement, Anatomie végétale, structure development, Biomasse, biomass production, Croissance, Modèle mathématique, ComputingMilieux_MISCELLANEOUS, Développement biologique, cotton plant
Abstract

International audience

Published
2010

48. Architectural modeling of wheat growth and validation study

Author

Zhan, Zhigang, Wang, Yiming, De Reffye, Philippe, Wang, Bingbing, Xiong, Yanwen, Eco-informatics (LIAMA), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Chinese Academy of Sciences [Changchun Branch] (CAS)-Institut National de Recherche en Informatique et en Automatique (Inria)-Institute of Automation - Chinese Academy of Sciences-Centre National de la Recherche Scientifique (CNRS), Modélisation de la croissance et de l'architecture des plantes (DIGIPLANTE), Mathématiques Appliquées aux Systèmes - EA 4037 (MAS), Ecole Centrale Paris-Ecole Centrale Paris-Inria Saclay - Ile de France, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Ecole Centrale Paris-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad), Ecole Centrale Paris-Ecole Centrale Paris-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Inria Saclay - Ile de France, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria), Institut National de la Recherche Agronomique (INRA)-Chinese Academy of Sciences [Changchun Branch] (CAS)-Institut National de Recherche en Informatique et en Automatique (Inria)-Institute of Automation - Chinese Academy of Sciences-Centre National de la Recherche Scientifique (CNRS)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Inria Saclay - Ile de France, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Mathématiques Appliquées aux Systèmes - EA 4037 (MAS), and Ecole Centrale Paris-Ecole Centrale Paris

Subjects
[INFO.INFO-MO]Computer Science [cs]/Modeling and Simulation
Published
2000

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