Article
Energy & Fuels
Junjie Chen, Zhiwei Pang
Summary: The study focused on investigating catalytically stabilized combustion of a methane-air mixture in a micro-scale heat-recirculating system to understand flame stabilization mechanisms and system design insights. The research identified factors for improved flame stability and combustion characteristics, highlighting the importance of catalytic action and heat-recirculating structure.
Review
Biochemistry & Molecular Biology
Long Chen, Binxin Wu
Summary: Membrane distillation (MD) is a promising water treatment technology with various applications, but further research is needed to determine appropriate industrial implementation. Computational fluid dynamics (CFD) has been widely used in analyzing MD processes and developing novel membranes, but there is still a need for more comprehensive and in-depth research in the field.
Article
Thermodynamics
Diego Alcaniz, Paolo Caccavale, Maria Valeria De Bonis, Ruth de los Reyes, Maria Dolores Ortola, Gianpaolo Ruocco
Summary: A new fluid heater based on BCET was proposed in this paper, with fully-dimensional thermo-fluid analysis implemented to achieve more uniform and effective heat transfer to temperature-sensitive working fluids. Through geometry optimization with internal baffles, the uncontrolled temperature excess was significantly reduced, while the pressure drop across the flow device was also lowered.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
Eliton Fontana, Lucas Battiston, Rosivaldo G. A. Oliveira, Claudia A. Capeletto, Luiz F. L. Luz Jr
Summary: The conversion of thermal radiation into electrical current in thermophotovoltaic devices is influenced by heat transfer, especially for micro-scale devices where heat management is crucial. A model considering wavelength-selective optical filters has been proposed to estimate cell efficiency by discretizing the radiation spectrum into bands and using average values. Results show the importance of optimal emitter/cell distance and secondary cooling mechanisms in improving cell efficiency.
Article
Thermodynamics
Ryno Laubscher, Schalk van der Merwe
Summary: This study introduces a computational fluid dynamics model of a semi-suspension fired bagasse boiler, which accurately predicts steam and gas temperatures with relative errors of less than 2%. The model is able to simulate heat transfer processes and investigate heat flux distributions in heat exchangers, providing valuable insights into boiler performance.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2021)
Article
Engineering, Environmental
Katarzyna Sindera, Mateusz Korpys, Marzena Iwaniszyn, Anna Gancarczyk, Mikolaj Suwak, Andrzej Kolodziej
Summary: The paper presents a research on a new type of catalytic carriers called streamlined structures, which are composed of short triangular channels with improved heat transfer properties and low pressure drop compared to monolithic structures. The study includes the analysis of flow resistance and heat transfer through Computational Fluid Dynamics (CFD) modeling and experiments, showing promising prospects for the development of catalytic reactors.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Energy & Fuels
Yu Zhang, Stijn Vangaever, Gilles Theis, Mike Henneke, Geraldine J. Heynderickx, Kevin M. Van Geem
Summary: This study evaluates the feasibility of biogas air-fuel combustion and natural gas oxy-fuel in steam cracking furnaces, investigating four cases experimentally and numerically. The impact of CO2 dilution on heat flux distribution is found to be minor, while discrepancies were observed in oxy-fuel combustion simulation predictions compared to experimental results. Adjusting model parameters and conducting additional experiments are necessary for further validation of the numerical model.
Article
Energy & Fuels
Jiaqiang E, Lei Cai, Jintao Li, Jiangjun Ding, Jingwei Chen, Bo Luo
Summary: The study shows that in the catalytic combustor, homogeneous reactions are significantly weakened, resulting in higher and more uniform outer wall temperatures, better fluid mixing, and reduced temperature difference at the outer wall. Additionally, the catalytic combustor exhibits lower average flow velocity and pressure loss at an inlet velocity of 10 m/s.
Article
Engineering, Chemical
Neha Yedala, Niket S. Kaisare
Summary: This study investigates the ignition and cold-start behavior of lean propane-air combustion in a U-bend catalytic microreactor through computational fluid dynamics (CFD) study. The ignition temperature is found to be 20K lower in the U-bend microreactor compared to the straight channel microreactor, but the transient ignition study revealed that the U-bend microreactor takes about 35 seconds longer to reach steady state due to heat distribution internally.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2021)
Article
Engineering, Environmental
Zirui Zhang, Chenhang Zhang, Huan Liu, Feng Bin, Xiaolin Wei, Running Kang, Shaohua Wu, Wenming Yang, Hongpeng Xu
Summary: A micro fluidized bed reactor was used to study the self-sustaining catalytic combustion of carbon monoxide (CO). Different catalysts were investigated to understand their contribution to the combustion process. The results showed that Cu1-xCexOy catalysts had lower ignition temperature and lean combustion limits compared to CuO and CeO2. The simulation using the Eulerian two-fluid model agreed with experimental measurements. The study also suggested that the fluidized-bed catalytic combustion technique can expand the range of CO-containing exhaust gas purification.
FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING
(2023)
Article
Engineering, Chemical
Alexander Van-Brunt, Patrick E. Farrell, Charles W. Monroe
Summary: This article presents the Onsager-Stefan-Maxwell thermodiffusion equations, which explain the Soret and Dufour effects in multicomponent fluids. This framework preserves the structure of the isothermal Stefan-Maxwell equations and separates the forces driving diffusion and heat flow. The authors demonstrate the feasibility of this method through numerical simulations.
Article
Thermodynamics
Jianqing Wang, Tianqi Liu, Chaozhong Xu, Jiajun Wang, Lian-Fang Feng
Summary: Computational fluid dynamics was used to study the laminar hydrodynamics and heat transfer characteristics of highly viscous fluid in a Sulzer mixer reactor (SMR), which showed better performance in terms of mixing and heat transfer compared to a straight tube heat exchanger (STHE) and a straight tube heat exchanger with segmental baffles (STHE-SG). SMR exhibited more uniform velocity and temperature distributions, as well as a narrower residence time distribution. The regularly arranged heat exchange tubes in SMR helped to continuously twist and split the highly viscous fluid, leading to radial mixing and improved heat transfer efficiency.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Engineering, Chemical
Yongshuai Li, Gaoyang Li, Tao Zhang, Yi Zheng, Yichao Shen, Hui Pan, Hao Ling
Summary: In this study, a coupled two-fluid CFD-CT model was used to investigate the mass transfer behavior and distribution of component concentration fields on trays within the two-staggered wall regions of a DPDWC. The model was validated by comparing the simulation results with the height-dependent calculation of the clear-liquid layer, and its effect on mass transfer in different zones of the tower under varying gas velocity conditions was analyzed. The results showed an initial increase and then decrease in mass-transfer efficiency with increasing gas velocity, and temperature variations across different regions of the tower due to the evaporative condensation effect of component mass transfer.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Thermodynamics
Yefferson Lopez, Julian Obando, Camilo Echeverri-Uribe, Andres A. Amell
Summary: The effect of water injection on the stability and emissions of flameless combustion was evaluated. Self-regeneration and combustion air oxygen enrichment were found to improve the stability of flameless combustion.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
D. Sanchez, J. A. Almendros-Ibanez, A. Molina, F. Bozzoli, L. Cattani, J. I. Corcoles
Summary: This study presents the results of a numerical simulation on the heat transfer performance of Newtonian and non-Newtonian fluids in a helical coiled tube under laminar regime. The rheological properties of the non-Newtonian fluids significantly influence the heat transfer rate, with higher heat transfer occurring in the helical section compared to the straight section. Furthermore, the mixing of the non-Newtonian fluids is improved in the coil section, leading to enhanced heat transfer.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
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)