Article
Chemistry, Physical
A. Hamrang, M. Abdollahzadeh, A. Moradi Bilondi, F. Bagherighajari, S. M. Rahgoshay, J. C. Pascoa
Summary: This study compares the performance of a PEMFC with conventional parallel serpentine flow fields and parallel serpentine-baffled flow fields. The results show that the PSBFF design can significantly improve cell performance, especially at higher pressure, temperature, and stoichiometric ratio.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Energy & Fuels
Jie Sun, Baichen Liu, Menglian Zheng, Yansong Luo, Zitao Yu
Summary: The study proposes modified serpentine flow field designs to improve the uniformity of electrolyte penetration. Experimental results show that the modified designs can significantly improve the current density. Simulation results indicate that the effectiveness of the modified designs is more significant in large-scale flow cells and depends on the magnitude of the under-the-rib hydraulic resistance and the applied flow rate.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Chemistry, Physical
Mingxin Liu, Wenxuan Fan, Guolong Lu
Summary: A three-dimensional numerical model is established to compare different types of locally improved structures in PEM fuel cells. The new variable diameter structure improves oxygen uniformity, while the block structure enhances local mass transfer. The presence of locally improved structures in the middle of the flow field achieves the best performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Yaw Dwamena Akenteng, Xinglin Yang, Yuan Zhao, Anatoly Lysyakov, Anton Matveev, Daifen Chen
Summary: Proton ceramic fuel cell (PCFC) has gained attention due to its advantages in the mid-temperature range. This study compares and analyzes a new inter-parallel flow field design with traditional flow fields, and finds that the design has the potential to be a suitable flow field for the cathode side of PCFC.
Article
Chemistry, Physical
Ravendra Gundlapalli, Sreenivas Jayanti
Summary: A new flip-flop directional split serpentine flow field is proposed to reduce pressure drop and improve electrochemical performance in industrial flow battery stacks. Experimental studies and computational fluid dynamics simulations confirm the effectiveness of the new flow field, showing improvements in discharge energy and efficiency compared to traditional serpentine flow fields. Scalability of the new flow field to large cell sizes has also been demonstrated.
JOURNAL OF POWER SOURCES
(2021)
Article
Energy & Fuels
Xi Chen, Qinxiao Liu, Ye Fang, Lingxuan He, Taiming Huang, Yan Zhang, Zhongmin Wan, Xiaodong Wang
Summary: The study introduces a novel multi-input and multi-output (MIMO) cooling flow field design and investigates the performance of U-shaped and Z-shaped cooling flow fields with different channel configurations using computational fluid dynamics methods. The results show that the Z-shaped design provides better temperature distribution compared to the U-shaped cooling flow field, aiding in reducing the maximum temperature value.
Article
Chemistry, Physical
Chunhua Min, Fei Li, Xiaomeng Gao, Kun Wang, Zhonghao Rao
Summary: A numerical model of a PEMFC with serpentine flow field was set up in this study. Rectangular or triangular blocks were arranged in the cathode channel to improve cell performance. The results showed that the arranged blocks effectively enhanced reactant mass transfer and the triangular blocks performed better than the rectangular blocks. The blocks arranged in the rear of the turn exhibited the best cell performance, which was attributed to the combined effect of under-rib flow and secondary flow generated by the blocks.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Fang-Bor Weng, Mangaliso Menzi Dlamini, Jenn-Jiang Hwang
Summary: Fluid distribution, conduction, and heat control are crucial for fuel cell performance. Metal foam and fine mesh can solve the challenges with straight and serpentine channels. In this study, different flow field designs are compared to improve PEMFC performance. Two foam designs are studied to solve the drawbacks of metal foam caused by high water retention. The fine wire mesh performs best under specific stoichiometry while the metal foam and fine mesh have the potential to drain water droplets and show symmetric fluid flow compared to serpentine design.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Energy & Fuels
Mehrdad Ghasabehi, Moosa Ashrafi, Mehrzad Shams
Summary: The study introduces a novel parallel flow field design to enhance the electrochemical performance and reduce the parasitic power loss of proton exchange membrane fuel cells. By comparing different structures and utilizing techniques such as tapered main channels and manipulating manifolds, the best flow field design is determined, with increasing cathode stoichiometry identified as the most effective factor in enhancing power density.
Article
Thermodynamics
Rong Guo, Lu Li
Summary: This paper discusses the application of serpentine channel cooling plates in thermal management systems. Numerical analysis and orthogonal experiments reveal that the parallel-spiral serpentine channel has the best comprehensive performance. The flow rate is the main factor affecting the maximum temperature and temperature distribution, while the channel height influences the pressure drop.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Seyed Ali Atyabi, Ebrahim Afshari, Elnaz Zohravi, Chinonyelum M. Udemu
Summary: A suitable cooling flow field design for proton exchange membrane fuel cell (PEMFC) can improve the cell's net generated power and achieve steady performance and longer lifespan. Among the different flow field designs, Case D demonstrated the best temperature uniformity and the lowest maximum temperature, albeit with the highest pressure drop. Taking into account the effect of high pressure drop, Case D achieved the highest power density.
Article
Energy & Fuels
Jiangnan Song, Ying Huang, Jing Zeng, Lunjun Chen, Yanli Wu
Summary: In order to improve the cooling performance of proton exchange membrane fuel cells, four new types of cooling plate flow field distribution were designed, and the temperature and pressure drop under different working conditions were analyzed by numerical simulation. The results show that the multi-channel design can effectively enhance the heat transfer effect and reduce the pressure drop of the cooling plate, and the local serpentine channel design can make the temperature distribution more uniform and avoid local overheating.
Article
Green & Sustainable Science & Technology
Jonghyun Son, Sukkee Um, Young-Beom Kim
Summary: Many efforts have been made to improve the performance of polymer electrolyte membrane fuel cells (PEMFCs) by enhancing mass transport properties. This study focused on the use of various baffle patterns in parallel channels to improve mass transfer in PEMFCs. The results showed that all analyzed baffle patterns improved PEMFC performance, with the staggered pattern located near the outlet and with a wide gap between baffles showing the best performance and lower pressure drop in the cathode flow field.
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING-GREEN TECHNOLOGY
(2023)
Article
Electrochemistry
Mahmut Caner Acar
Summary: In this study, the cooling performance of different channel designs based on serpentine flow field with varying channel to rib width ratios (CR) was investigated numerically. The results showed that increasing the CR led to a more uniform temperature distribution, better cooling performance, and lower pressure drop in the polymer electrolyte membrane fuel cell stack.
Article
Thermodynamics
Christian Suarez, Alfredo Iranzo, Baltasar Toharias, Felipe Rosa
Summary: This article presents an experimental analysis of a novel bioinspired design of the channels of a PEMFC, which shows improved water management capability at high humidity and increased peak power.
Article
Electrochemistry
Dongwoo Shin, Jin Hyun Nam
ELECTROCHIMICA ACTA
(2015)
Article
Chemistry, Physical
Jin Hyun Nam
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2015)
Article
Chemistry, Physical
Kwang Nam Kim, Jung Ho Kang, Sang Gun Lee, Jin Hyun Nam, Charn-Jung Kim
JOURNAL OF POWER SOURCES
(2015)
Article
Computer Science, Interdisciplinary Applications
Dongwoo Shin, Seung Man Baek, Jin Hyun Nam, Charn-Jung Kim
COMPUTERS & CHEMICAL ENGINEERING
(2016)
Article
Electrochemistry
Jin Hyun Nam
ELECTROCHIMICA ACTA
(2016)
Article
Electrochemistry
S. M. Baek, D. Shin, S. Sohn, J. H. Nam
Article
Chemistry, Physical
Sangho Sohn, Seung Man Baek, Jin Hyun Nam, Charn-Jung Kim
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2016)
Article
Chemistry, Multidisciplinary
Jin Hyun Nam
BULLETIN OF THE KOREAN CHEMICAL SOCIETY
(2017)
Article
Chemistry, Physical
Areum Jeong, Dongwoo Shin, Seung Man Baek, Jin Hyun Nam
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2018)
Article
Chemistry, Physical
Seung Man Baek, Jung Ho Kang, Kyu-Jin Lee, Jin Hyun Nam
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2014)
Article
Chemistry, Physical
Kyu-Jin Lee, Jung Ho Kong, Jin Hyun Nam
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2014)
Article
Chemistry, Physical
Seung Man Baek, Areum Jeong, Jin Hyun Nam, Charn-Jung Kim
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2019)
Article
Chemistry, Physical
Yun Seok Oh, Jin Hyun Nam
Summary: This study numerically determined the active reaction thickness of nickel catalyst layers and investigated the small-scale steam methane reforming conditions. The results showed that the active thickness did not exceed 0.15 mm under certain pressure, and the effects of volume-specific nickel surface area and diffusion properties were studied.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Seung-Hun Lee, Jin Hyun Nam, Charn-Jung Kim, Hyung Min Kim
Summary: The lattice Boltzmann method was used to simulate the three-dimensional intrusion process of liquid water in the gas diffusion layer of a polymer electrolyte membrane fuel cell in this study. It was found that fiber orientation significantly influences the transport of liquid water in the GDL, and the stochastically reconstructed GDL incorporating fiber orientation better demonstrates the mass transport properties of the GDL.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Electrochemistry
Jin Hyun Nam
JOURNAL OF ELECTROCHEMICAL SCIENCE AND TECHNOLOGY
(2017)
Article
Thermodynamics
Hai Zhao, Puzhen Gao, Xiaochang Li, Ruifeng Tian, Hongyang Wei, Sichao Tan
Summary: This study numerically investigates the interaction between flow-induced vibration and forced convection heat transfer in a tube bundle. The results show that the impact of flow-induced vibration on heat transfer varies in different flow velocity regions.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Rohit Chintala, Jon Winkler, Sugirdhalakshmi Ramaraj, Xin Jin
Summary: The current state of fault detection and diagnosis for residential air-conditioning systems is expensive and not suitable for widespread implementation. This paper proposes a cost-effective solution by introducing an automated fault detection algorithm as a screening step before more expensive tests can be conducted. The algorithm uses home thermostats and local weather information to identify thermodynamic parameters and detect high-impact air-conditioning faults.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
A. Azimi, N. Basiri, M. Eslami
Summary: This paper presents a novel optimization algorithm for improving the water-film cooling system of photovoltaic panels, resulting in a significant increase in net energy generation.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Duc-Thuan Phung, Chin-Hsiang Cheng
Summary: In this study, a novel CFDMD model is used to analyze and investigate the behavior of thermal-lag engines (TLE). The study shows that the CFDMD model effectively captures the thermodynamic behavior of the working gas and the dynamic behavior of the engine mechanism. Additionally, the study explores the temporal evolution of engine speed and the influence of various parameters on shaft power and brake thermal efficiency. The research also reveals the existence of a thermal-lag phenomenon in TLE.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Haiying Yang, Yinjie Shen, Lin Li, Yichen Pan, Ping Yang
Summary: The purpose of this article is to find a measure to improve the interfacial thermal transfer of graphene/silicon heterojunction. Through molecular dynamics simulation, it is found that surface modification can significantly reduce the thermal resistance, thereby improving the thermal conductivity of the graphene/silicon interface.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Qiong Wu, Yancheng Wang, Haonan Zhou, Xingye Qiu, Deqing Mei
Summary: This article introduces a visible methanol steam reforming microreactor, which uses an optical crystal as an observation window and measures the reaction temperature in real-time using infrared thermography. The results show that under lower oxygen to carbon ratio conditions, the microreactor has a higher heating rate and a stable gradient in temperature distribution.
APPLIED THERMAL ENGINEERING
(2024)
Review
Thermodynamics
Giulia Manco, Umberto Tesio, Elisa Guelpa, Vittorio Verda
Summary: In the past decade, there has been a growing interest in studying energy systems for the combined management of power vectors. Most of the published works focus on finding the optimal design and operations of Multi Energy Systems (MES). However, for newcomers to this field, understanding how to achieve the desired optimization details while controlling computational expenses can be challenging and time-consuming. This paper presents a novel approach to analyzing the existing literature on MES, with the aim of guiding practical development of MES optimization. Through the discussion of six case studies, the authors provide a mathematical formulation as a reference for building the model and emphasize the impact of different aspects on the problem nature and solver selection. In addition, the paper also discusses the different approaches used in the literature for incorporating thermal networks and storage in the optimization of multi-energy systems.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xuepeng Yuan, Caiman Yan, Yunxian Huang, Yong Tang, Shiwei Zhang, Gong Chen
Summary: In this study, a multi-scale microgroove wick (MSMGW) was developed by laser irradiation, which demonstrated superior capillary performance. The surface morphology and performance of the wick were affected by laser scan pitch, laser power, repetition frequency, and scanning speed. The MSMGW showed optimal capillary performance in alumina material and DI water as the working fluid.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Maofei Mei, Feng Hu, Chong Han
Summary: This paper proposes an effective local search method based on detection of droplet boundaries for understanding the dynamic process of droplet growth during dropwise condensation. The method is validated by comparing with experimental data. The present simulation provides an effective approach to more accurately predict the nucleation site density in future studies.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Rahul Kumar Sharma, Ashish Kumar, Dibakar Rakshit
Summary: The study explores the use of phase change materials (PCM) as a retrofit with Heating Ventilation and Air-conditioning systems (HVAC) to reduce energy consumption and improve air quality. By incorporating PCM with specific thickness and fin configurations, significant energy savings can be achieved in comparison to standard HVAC systems utilizing R134a. This research provides policymakers with energy-efficient and sustainable solutions for HVAC systems to combat climate change.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Zhenhua Ren, Xiangjin Meng, Xingang Qi, Hui Jin, Yunan Chen, Bin Chen, Liejin Guo
Summary: This paper investigates the heat transfer mechanism and factors influencing thermal radiation in the process of supercritical water gasification (SCWG) of coal, and proposes a comprehensive numerical model to simulate the process. Experimental validation results show that thermal radiation accounts for a significant proportion of the total heat exchange in the reactor and a large amount of radiant energy exists in the important spectral range of supercritical water. Enhancing radiative heat transfer can effectively increase the temperature of the reaction medium and the gasification rate.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Mauro Abela, Mauro Mameli, Sauro Filippeschi, Brent S. Taft
Summary: Pulsating Heat Pipes (PHP) are passive two-phase heat transfer devices with a simple structure and high heat transfer capabilities. The actual unpredictability of their dynamic behavior during startup and thermal crisis hinders their large-scale application. An experimental apparatus is designed to investigate these phenomena systematically. The results show that increasing the number of evaporator sections and condenser temperature improves the performance of PHP. The condenser temperature also affects the initial liquid phase distribution and startup time.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Ke Gan, Ruilian Li, Yi Zheng, Hui Xu, Ying Gao, Jiajie Qian, Ziming Wei, Bin Kong, Hong Zhang
Summary: A 3-dimensional enhanced heat pipe radiator has been developed to improve heat dissipation and temperature uniformity in cooling high-power electronic components. Experimental results show that the radiator has superior heat transfer performance compared to a conventional aluminum fin radiator under different heating powers and wind speed conditions.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xinyi Zhang, Shuzhong Wang, Daihui Jiang, Zhiqiang Wu
Summary: This study focuses on recovering waste heat from blast furnace slag using dry centrifugal pelletizing technology. A comprehensive two-dimensional model was developed to analyze heat transfer dynamics and investigate factors influencing heat exchange efficiency. The findings have important implications for optimizing waste heat recovery and ensuring safe operations.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xincheng Wu, An Zou, Qiang Zhang, Zhaoguang Wang
Summary: The boosting heat generation rate of high-performance processors is challenging traditional cooling techniques. This study proposes a combined design of active jet intermittency and passive surface modification to enhance heat transfer.
APPLIED THERMAL ENGINEERING
(2024)