Article
Energy & Fuels
Chi Zhang, Siwei Zhu, Du Wang, Cheng Lei, Yan Zhao
Summary: In this study, the non-uniform lithium deposition in porous lithium metal anodes was simulated using an electrochemical phase field model. Four factors were investigated to enhance homogeneous lithium deposition and increase the capacity for inside-pore lithium deposition. It was found that increasing the diffusion coefficient of lithium ion and designing a structured lithium metal anode with gradient reaction constants and porosity can improve inside-pore lithium deposition.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Crystallography
Muhammed Ali Shaikh Abdul, Ahmad Zubair Yahaya, Mustafa Anwar, Mun Teng Soo, Andanastuti Muchtar, Vadim M. Kovrugin
Summary: The study investigates microstructural changes in Ni-SDC cermet anodes using EBSD, highlighting the impact of grain size, distribution, and synthesis methods on performance. Results show that Ni-SDC from GNP outperforms ball-milled samples due to differences in TPB density and phase connectivity, affecting mechanical and electrical conductivity. The presence of sufficient porosity in GNP-made samples eliminates the need for a pore former, emphasizing the importance of TPB length and distribution in optimizing performance. A single cell using GNP-prepared Ni-SDC exhibited a maximum power density of 227 mW/cm(2) in H-2 and 121 mW/cm(2) in CH4 at 800 degrees C.
Article
Engineering, Chemical
Xuan Nan, Zhihao Shen, Jingming Hou, Guodong Li
Summary: A new coupling model, which combines FD/IBM, VOF and DEM, has been proposed for simulating gas-liquid flow and irregular-shaped particulate flows. Various computing cases were used for validation and the results showed good consistency with experimental data. The model has been proven reliable for simulating particulate flows with Reynolds numbers up to 420,000, and it demonstrates strong capability in capturing solid-fluid motions, especially for irregular-shaped objects at different scales from 0.00167 to 0.3 m, which has potential applications in industrial engineering.
Article
Chemistry, Physical
Yu Xiang, Qingping Li, Xijun Wei, Xiaoyan Li, Qiaoji Zheng, Yu Huo, Dunmin Lin
Summary: The NiS2/NiSe2 heteroboxes as anodes for SIBs exhibit advantages of exposing more active sites at phase boundaries, accelerating sodium storage kinetics, and maintaining ultralong reversible capacity and good rate capability. This rational construction of phase boundary with unique structure provides guidance for the development of advanced SIBs anode materials.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Physical
Shaoping Wu, Guoyao Li, Hezhou Liu, Huanan Duan
Summary: A porous PVDF-PAMPSLi polymer membrane prepared by a one-step phase separation method is able to stabilize the lithium metal anode, provide a facile lithium-ion transport pathway, and improve the lithium-ion diffusion kinetics, leading to enhanced cycling stability and performance of batteries.
JOURNAL OF POWER SOURCES
(2022)
Article
Construction & Building Technology
Yanzhen Zhu, Honglei Sun, Shanlin Xu, Lingkai Hu, Hongtao Cao, Yuanqiang Cai, Junwei Liu
Summary: This study used computational fluid dynamics and discrete element method (CFD-DEM) to investigate the penetration and filtration behaviors of cement grout in porous media. The validity of a model for the interaction forces of cement particles was confirmed by comparing simulation and experimental results. The size ratio of pore openings to cement particles was found to be a critical factor influencing cement grouting, and grouting pressures had little effect on penetration distance and cement distribution in filtration-prone soil. This study provides new insights into the mechanics of cement grouting in porous media.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Engineering, Geological
M. Krzaczek, M. Nitka, J. Tejchman
Summary: In this study, a novel DEM-based pore-scale thermal-hydro-mechanical model was developed to simulate fracture propagation in non-saturated porous materials. The model successfully integrated discrete mechanics with fluid mechanics and heat transfer, and investigated the effects of advection on cooling as well as the impact of a macro-crack on fluid parameters distribution.
Article
Engineering, Environmental
Shaotong Fu, Limin Wang
Summary: A new algorithm called unresolved LBM-DEM is proposed for discrete particle simulation. It combines lattice Boltzmann method (LBM) for fluid phase and discrete element method (DEM) for particle phase, with immersed moving boundary (IMB) used for gas-solid coupling. The method has advantages in resolving Geldart A particles and computational efficiency, with GPU parallel computation implemented. Validation tests showed good agreement with experimental data and one to two orders of magnitude speed up compared to traditional algorithms. This suggests unresolved LBM-DEM as a promising strategy for fluidization and multiphase flows.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Geological
Pengfei Liu, Meng Sun, Zejian Chen, Shuai Zhang, Feng-Shou Zhang, Yunmin Chen, Weiqiu Chen, Bate Bate
Summary: The combination of computational fluid dynamic and discrete element method was used to study fines migration. Three criteria for particle deposition conditions were identified using a particle-scale mechanical analysis method. The results showed that the deposition efficiency increased from 8.5% to 37.8% as the surface energy density increased. Clogging occurred when the electrical force was more than ten times the drag force.
Article
Engineering, Environmental
Yuki Mori, Mikio Sakai
Summary: This study investigates the stability issue in the DEM-CFD method, proposes a new implicit algorithm to address the instability problem of the drag force term, and conducts verification tests to demonstrate its accuracy and stability.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Multidisciplinary
Zhengshou Lai, Jidong Zhao, Shiwei Zhao, Linchong Huang
Summary: This paper presents an improved framework of the immersed boundary method (IBM)-based fully resolved computational fluid dynamics (CFD) and discrete element method (DEM), emphasizing on irregular-shaped particles and their implications to particle-fluid interactions. The proposed SDF-CFD-DEM framework leverages signed distance field (SDF) as a generic interface for universal modeling of arbitrarily shaped particles interacting with multiphase fluids. It is validated and demonstrated with examples including particle settling, drafting-kissing-tumbling, immersed granular collapse, and mudflow, showing good accuracy, robustness, and potential for efficient computational modeling of granular flows with arbitrary-shaped particles.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Engineering, Electrical & Electronic
Yinhang Zhang, Xiuhua Men, Shuai Wang, Xiuli Fu, Liwen Chen
Summary: The pneumatic conveying process of fine particles through filters was studied using the CFD-DEM simulation method. The effects of particle feed rates and initial particle velocities on the plugging rate and settling velocity in pleated filters were analyzed, as well as the effect of particle deposition height on the fluid zone.
Review
Chemistry, Multidisciplinary
Jianyu Chen, Yizhou Wang, Sijia Li, Huanran Chen, Xin Qiao, Jin Zhao, Yanwen Ma, Husam N. Alshareef
Summary: Alkali metals are promising anode materials for next-generation high-energy-density batteries, but uneven current and ion distribution may cause undesirable dendrite growth. This article introduces a smart and versatile strategy to incorporate alkali metals into porous metal current collectors, addressing these issues and promoting the practical application of alkali metal anodes.
Article
Engineering, Environmental
Pengfei Liu, Shaokai Nie, Wenyuan Wang, Shuai Zhang, Bate Bate, Yunmin Chen
Summary: Transportation process of nano scale zero valent iron (nZVI) in clay-rich soils is complicated and crucial for in-situ remediation of contaminated sites. A coupled computational fluid dynamic and discrete element method (CFD-DEM) was used to investigate the interplays of repulsive and attractive forces and the injection velocity of this process.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Article
Engineering, Chemical
Steven R. Dahl, Peiyuan Liu, William D. Fullmer, Christine M. Hrenya
Summary: The performance of two conceptually simple uncertainty quantification techniques are compared with the rigorous nested-loop sampling technique. The results demonstrate that these simplified techniques have significant computational advantages and yield uncertainties in model outputs that are consistent with the full-sampling method.
Article
Automation & Control Systems
Sang Wook Han, Young Yun Woo, Taekyung Lee, Jeong Kim, Ji Hwan Jeong, Young Hoon Moon
Summary: This study developed and implemented a customized hydroforming process to fabricate double-layered tubes with circumferentially corrugated pattern, providing a useful solution for manufacturing high-performance compact heat exchangers with enhanced reliability and applicability, aiming to improve energy efficiency and sustainability.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Thermodynamics
Seongkwan Ham, Siyoung Choi, Ji Hwan Jeong
Summary: The study found that in VRF systems, the distribution characteristics of air-water two-phase flow are significantly influenced by void fraction, with void fraction changes having a larger impact on distribution than changes in mass flow rate. The distribution in the header is minimally affected by variations in downstream flow resistance. Previous empirical correlations were ineffective in predicting two-phase flow distribution accurately, while the use of R410A as a working fluid appeared to mitigate refrigerant mal-distribution compared to air-water flow.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2021)
Article
Materials Science, Multidisciplinary
Ji Hwan Jeong, Ji Young Park, Young Tae Park, Bo-Hye Kim
Summary: Silole-derived porous carbon nanofibers (Si-CNFs) containing oxygen-functional groups show improved electrode performance due to well-developed pores and more heteroatoms. The presence of polar oxygen groups leads to denser electrolyte ion adsorption on the surface, resulting in high specific capacitance and energy density in an aqueous electrolyte.
Article
Chemistry, Physical
Hee-Jo Lee, Ji Hwan Jeong, Bo-Hye Kim
Summary: This study experimentally investigated the microwave transmission characteristics of carbon nanofiber (CNF) with different micrometer-scale thicknesses. The results showed that the thickness of CNF film significantly affected signal transmission level and electromagnetic properties in the microwave regime, with changes in electrical permittivity and microwave conductivity observed as thickness increased.
Article
Energy & Fuels
Jaehoon Sim, Hyoin Lee, Ji Hwan Jeong
Summary: A variable-path heat exchanger (VPHE) was proposed for optimizing the heat exchanger of an outdoor unit in a heat pump system. Numerical analysis and experimental measurements showed that the VPHE significantly improved heat transfer capacity and coefficient of performance, demonstrating potential for enhancing overall system performance.
Article
Engineering, Mechanical
Md Sarwar Alam, Ji Hwan Jeong
Summary: Molecular dynamics simulations were used to investigate the condensation process of the HFO refrigerant R1123 and its blends with R134a. The condensation rate was found to be higher at lower temperatures, with vapor molecules transitioning rapidly to a subcooled liquid state. The process involved the formation of molecular clusters followed by aggregation into condensate droplets, with predictions made for liquid density and isobaric heat capacity over a temperature range of 273.15 K to 298.15 K.
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2021)
Article
Nuclear Science & Technology
Sung-Ho Park, Won Tae Kim, Ji Hwan Jeong
Summary: By analyzing the demand characteristics of nuclear power plant component parts, it was found that most of the demand for key components occurs during planned maintenance periods, and the maintenance parts required vary according to different reactor types.
ANNALS OF NUCLEAR ENERGY
(2021)
Article
Thermodynamics
Danish Ansari, Ji Hwan Jeong
Summary: The study introduced a novel microchannel heat sink design based on the different thermal conductivities of materials, using silicon for low-heat-flux zones and diamond for high-heat-flux zones. The composite design showed significant performance enhancement in thermal management without increasing pressure drop or pumping power. Numerical analysis demonstrated the effectiveness of the composite heat sink in mitigating die-level hotspots in electronic cooling applications.
APPLIED THERMAL ENGINEERING
(2021)
Article
Engineering, Chemical
Hyun Mo Ku, Sung-Ho Park, Ji Hwan Jeong
Summary: The thermal and hydraulic characteristics of single-phase flow through porous media have been studied extensively, while knowledge of two-phase flow is limited. Experimental measurements of pressure drops in metal foams revealed discrepancies between empirical correlations and data for two-phase flows. A new correlation incorporating slip between phases accurately predicted pressure drops in two-phase flow through porous media.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Thermodynamics
Mehdi Rasti, Ji Hwan Jeong
Summary: Recent research focused on the presence of vapor bubbles of R600a in the capillary tube of refrigerators under subcooled conditions. The study aimed to investigate the effects of ambient temperature and R600a charge amount on refrigerant state and mass flow rate, revealing a significant decrease in mass flow rate under a non-equilibrium two-phase state. A new empirical parameter was introduced to improve predictions under such conditions.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2021)
Article
Nuclear Science & Technology
Vikrant Siddharudh Chalgeri, Ji Hwan Jeong
Summary: This study investigates the flow regime transition criteria in co-current air-water two-phase flow inside narrow rectangular channels and proposes a model that shows good agreement with experimental data.
NUCLEAR ENGINEERING AND TECHNOLOGY
(2022)
Article
Chemistry, Physical
Ji Hwan Jeong, Hee-Jo Lee, Myung Hwa Kim, Bo-Hye Kim
Summary: This study aims to enhance the surface redox reactions of MnO2 by designing hollow carbon nanofibers, leading to optimized electrochemical performance. The PPMMn symmetrical supercapacitors demonstrate excellent capacitive behavior, long-term cycling stability, and potential for energy storage applications.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Thermodynamics
Sung -Ho Park, Ji Hwan Jeong
Summary: This paper investigates the heat transfer efficiency of open-cell porous metal fins and derives an analytical model for fin efficiency based on the Kelvin cell. The proposed model is compared to computational fluid dynamics analysis and shows good agreement. It provides a simplified approach to analyzing heat transfer in porous metals used in engineering applications.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Min Kyu Kim, Hyoin Lee, Ji Hwan Jeong
Summary: This study measured the mass flow rate of R32 through EEVs under real operating conditions. Previous empirical correlations showed poor agreement with the experimental data. Therefore, a new empirical correlation was developed, which showed good agreement with the measured data.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2023)
Review
Thermodynamics
Mehdi Rasti, Ji Hwan Jeong
Summary: Previous studies on predicting the moisture evaporation rate inside the drum of clothes dryers have utilized various methods, but have shown limitations in generality or accuracy. Therefore, the development of a new accurate prediction model is crucial for this process.
INTERNATIONAL JOURNAL OF AIR-CONDITIONING AND REFRIGERATION
(2021)
