Article
Energy & Fuels
Xin Yang, Hao Zhou, Hao Wu
Summary: A dynamic CFD model with conjugate heat transfer is developed to predict the effect of multiple operation conditions on ash deposition. The model considers particle sticking and erosion, and achieves stable dynamic mesh morphing using a smoothing method. The results show good agreement with experimental observations, and suggest that coarse particles reduce the deposition rate caused by smaller particles via erosion.
Article
Construction & Building Technology
Haiguo Yin, Daina Ji, Yuanyuan Wang, Yaokun Huo, Xin Deng, Jiali Wang, Zhenjun Ma, Angui Li
Summary: Column attachment ventilation mode (CAV) is a new form of air distribution that utilizes the Coanda effect to efficiently transport air from the top of a room to the lower occupied zone. This study investigated the movement and diffusion characteristics of particulate matter (PM) in CAV mode. The results showed that particles of different sizes had different behaviors, and the air supply temperature difference had a significant impact on PM distribution.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Thermodynamics
Gautham Krishnamoorthy, Nghia Duc Tin Nguyen
Summary: The lack of particle size distribution measurements for coarse fly-ash particles near the depositing surface makes it difficult to develop mechanistic models for ash deposition. However, this problem can be partially solved by measuring the deposition rate and particle size distribution of the ash deposits.
COMBUSTION SCIENCE AND TECHNOLOGY
(2023)
Article
Energy & Fuels
Gautham Krishnamoorthy, Monika E. Kuznia, KayLee M. Smith, Wayne S. Seames, Yueming Wang, Jost O. L. Wendt
Summary: Recent experiments and numerical simulations showed a significant increase in ash deposition rates in oxy-coal combustion systems, with aerodynamic effects playing a dominant role and simplistic modeling approaches leading to inaccurate predictions. The study highlights the importance of considering aerodynamics and particle size distributions in predicting deposit characteristics.
Article
Engineering, Chemical
Yibin Wang, Xiaoxiao Wang, Houzhang Tan, Xinwei Xu
Summary: The condensation rate of salt vapors near the superheater or reheater tubes greatly affects the deposition rate of SiO2 particles. The impact and adhesion behavior of solid and molten particles are mainly influenced by the condensation of salt vapors.
ASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Green & Sustainable Science & Technology
Mahdi Ahmadzadeh, Emad Farokhi, Mehrzad Shams
Summary: The study investigated the effect of indoor airflow on the distribution and transmission of droplets emitted by an infected person during speaking and coughing in a classroom. Results showed that air conditioning and opening windows near the infected person significantly reduced environmental pathogens, with a recommendation to keep windows open in indoor environments, especially next to the speaker.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Thermodynamics
Chien-Chou Tseng, Yu-Chi Wang, Ming-Ing Ho
Summary: A computational framework for DED process in a two-phase flow model has been developed. An analytical model is used to process the information of the powder stream, which is then input into the cladding model utilizing CFD technique. Scaling laws for the geometry of the final track have been developed using Buckingham pi theorem. The dimensionless laws in this study match the trends of measured data well. The dimensionless cladding width is determined by the dimensionless laser power with a positive correlation.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Energy & Fuels
Michel Rivero, Sayra Orozco, Alberto Beltran
Summary: Systems based on phase change materials rely not only on energy absorption or release capacity, but also on the rate of these processes. This study numerically investigates the time-dependent phase change process using ANSYS Fluent. The results show that small aspect ratios and positive tilting angles can modify flow dynamics and affect the melting process and Nusselt number. Additionally, partial heating reduces melting time by up to 38% compared to homogeneous heat flux distribution.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Engineering, Environmental
Menglong Bai, Linyao Zhang, Yijun Zhao, Shaozeng Sun, Shangbin Du, Penghua Qiu, Wenda Zhang, Dongdong Feng
Summary: In this study, a particle deposition model based on critical viscosity was used to predict the deposition and rebound of particles on the furnace wall. The results showed that controlling the particle size of fly ash particles within 60 μm can effectively reduce the generation of secondary MSWI fly ash and lower post-treatment costs.
Article
Engineering, Mechanical
Jan-Philipp Kueppers, Tamara Reinicke
Summary: This paper presents the development and validation of a lightweight fluid solver based on the Navier-Stokes equations coupled to a special blade element method (BEM) for vertical axis turbines. The Actuator Surface Model (ASM) offers a medium fidelity tool that bridges the gap between expensive blade resolving computational fluid dynamics (CFD) calculations and simple momentum models, providing a fast and precise alternative for initial design of vertical axis turbines.
JOURNAL OF FLUIDS AND STRUCTURES
(2021)
Article
Engineering, Chemical
Hongjie Yan, Zhengzong Huang, Ming Hu, Jingwei Qi, Liu Liu
Summary: The plasma melting furnace is widely used in the harmless treatment of waste incineration due to its low leaching rate of heavy metals and high energy utilization. This paper numerically models the gas-solid flow in the furnace and studies the behavior of slag particles. The results show that pelletizing the raw fly ash is necessary for successful melting reaction and to prevent erosion with the graphite cathode. The velocity and temperature fields in the furnace are asymmetric due to the interaction between flue gas and slag particles. The study also analyzes the distribution of slag particles on the bath surface and discusses the collisional erosion effect on the graphite cathode.
Article
Environmental Sciences
Frances Beckett, Eduardo Rossi, Benjamin Devenish, Claire Witham, Costanza Bonadonna
Summary: An aggregation scheme has been developed for the Lagrangian atmospheric transport and dispersion model NAME, which is used by the London Volcanic Ash Advisory Centre (VAAC) for predicting volcanic ash clouds. The scheme uses the fixed pivot technique to simulate aggregation processes in an eruption column. A parametric study and scaling analysis were conducted to understand the sensitivity of the output aggregated grain size distribution (GSD) to the model parameters. It was found that the modelled GSD is sensitive to the density distribution and grain size distribution of the non-aggregated particles at the source.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
Article
Engineering, Chemical
Wei Liu, Daoyin Liu, Yingjuan Zhang, Bo Li
Summary: In this study, the Eulerian-Eulerian model with Population Balance Model (PBM) is used to predict the particle size distribution (PSD) of SiO2 particles in the MCVD process, and the Discrete Particle Model (DPM) is used to investigate the trajectories and deposition locations of the particles. The results show that the deposition distance and flight time of the particles increase with the increase of particle size and wall temperature.
Article
Energy & Fuels
Fanfei Lin, Zhongjie Shen, Qinfeng Liang, Zhenghua Dai, Jianliang Xu, Haifeng Liu
Summary: In this study, a comprehensive model for the adhesion of coal ash or char particles was established. The model takes into account the physical properties of the particles and the slag layer, and includes a sub-model for adhesion probability based on particle surface properties. The model was validated through particle deposition experiments and the results showed that the particle adhesion is influenced by the surface characteristics.
Article
Green & Sustainable Science & Technology
Joachim Toftegaard Hansen, Mahak Mahak, Iakovos Tzanakis
Summary: This study investigates the performance enhancement of vertical axis wind turbine (VAWT) pairs through CFD simulations, finding that optimized layouts can increase power output of wind turbine farms. Results show that mesh size, domain size, and azimuth increment have the biggest impact on the converged results. Pairs of VAWTs and three turbines in series exhibited higher power output compared to operating in isolation.
Article
Engineering, Chemical
Qinggang Qiu, Xiaojing Zhu, Lin Mu, Shengqiang Shen
DESALINATION AND WATER TREATMENT
(2016)
Article
Agricultural Engineering
Lin Mu, Jianbiao Chen, Pikai Yao, Dapeng Zhou, Liang Zhao, Hongchao Yin
BIORESOURCE TECHNOLOGY
(2016)
Article
Energy & Fuels
Lin Mu, Chen Zhao, Liang Zhao, Bowen Chen, Zhiling Xu, Zhuqiang Yang, Yan Shang, Hongchao Yin
Article
Engineering, Chemical
Lin Mu, Hongchao Miao, Chen Zhao, Zhende Zhai, Yan Shang, Hongchao Yin
Summary: A comprehensive CFD model was used to investigate the deposition behaviors of ash particles with high AAEM contents, focusing on behavior models and morphology evolution of ash deposits. It was found that factors such as tube spacing, tube arrangement, and ash particle kinetic energy have significant effects on ash deposition behavior.
Article
Environmental Sciences
Jianbiao Chen, Wenhao Xu, Lin Zhu, Fang Xu, Lin Mu, Yinfeng Wang, Yuezhao Zhu
Summary: This study investigated the combustion properties, kinetics, thermodynamics, operation parameters, and gas emissions of petrochemical wastewater and its sludge. Results showed that the gas pollutants in flue gas after incineration did not exceed discharge limits, and combustion efficiency met regulatory requirements. The research provided insights into the combustion performance and environmental impact of petrochemical wastewater incineration.
JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT
(2021)
Article
Energy & Fuels
Lin Mu, Ranyu Wang, Zhende Zhai, Bin Zhang, Yan Shang, Hongchao Yin
Summary: This paper used conventional thermogravimetric analysis and a new congruent-mass thermogravimetric analysis to study the reaction mechanism and influencing factors of the co-pyrolysis process of coal and biomass. The results show that congruent-mass thermogravimetric analysis can compare the interactions in the co-pyrolysis process more intuitively and reduce the influence of initial mass on the determination of interaction relationship. The co-pyrolysis process exhibits a synergistic effect, and the heating rate and carrier gas flow rate have an effect on the process. The activation energy required in the co-pyrolysis stage is lower than that in the pyrolysis stage alone. Biomass coke has a more developed pore structure compared to coal.
BIOMASS CONVERSION AND BIOREFINERY
(2023)
Article
Chemistry, Multidisciplinary
Lin Mu, Zhaoyi Huo, Fuxing Chu, Zhen Wang, Yan Shang, Hongchao Yin, Tingting Xu
Summary: Chemical looping combustion (CLC) is a promising CCS technology that can enhance the efficiency of carbon capture by efficiently separating CO2 and H2O. The use of different types of biomass ashes to modify natural iron ore oxygen carriers has shown significant improvements in reactivity and cycle stability. Higher temperatures in the range of 800 to 950 degrees Celsius are more effective in promoting the CLC process, while higher H2O flow rates have a limited effect due to hydrogen inhibition. It is suggested that the application of biomass ash-modified iron ore oxygen carriers is an effective strategy to enhance the CLC process.
Article
Agricultural Engineering
Jianbiao Chen, Hua Fang, Fang Xu, Yi Ren, Zhiyong Wang, Yuezhao Zhu, Lin Mu
Summary: The pyrolysis characteristics and kinetics of pine wood with iron-containing petrochemical sludge ash were studied, showing that the presence of PSA promoted the conversion of PW. Thermodynamic analysis revealed a gradual loss of oxygen from Fe2O3 in PSA during co-pyrolysis. Kinetic parameters showed a decrease in activation energy with PSA addition, with the most suitable kinetic models being D-3 and D-4 for PW and its mixtures with PSA, respectively.
BIORESOURCE TECHNOLOGY
(2022)
Article
Energy & Fuels
Hongchao Miao, Hongchao Yin, Yan Shang, Xiao Chi, Lin Mu
Summary: This paper proposes a transient numerical model to predict the ash deposition propensity on a single heat transfer surface, considering four deposition mechanisms and alkali vapor condensation behavior. Various methods such as dynamic mesh technology and resistance network model are used to analyze deposition and heat transfer characteristics, effectively predicting deposition rate and heat transfer parameters in experimental tests.
Article
Engineering, Chemical
Lin Mu, Lin Zhao, Tiancai Hu, Bin Zhang, Zhende Zhai, Yan Shang, Hongchao Yin
Summary: The biomass-based chemical looping gasification-integrated power generation cycle model combined BCLG and IGCC using Aspen Plus software. Optimal operating conditions were established for pine sawdust, rice stalk, and corn stalk in the BCLG process. Solar energy was found to be more efficiently used to heat compressed air for the gas turbine in the BCLG-IGCC system.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Thermodynamics
Jianbiao Chen, Shuaifei Gao, Fang Xu, Wenhao Xu, Yuanjiang Yang, Depeng Kong, Yinfeng Wang, Huicong Yao, Haijun Chen, Yuezhao Zhu, Lin Mu
Summary: Pyrolysis tests were conducted on sludge obtained from a steel production enterprise under different conditions. The results showed that the initial weight and heating rate had an impact on the pyrolysis process, and the natural dehydration rate of wet sludge increased as pore canals and crannies formed on the surface.
Article
Energy & Fuels
Lin Mu, Zhen Wang, Di Wu, Liang Zhao, Hongchao Yin
Summary: Hydrothermal carbonization is an effective biomass pretreatment technology that converts high moisture biomass into carbon-rich hydrochar. This study used machine learning models to predict the fuel properties of hydrochar based on hydrothermal conditions and biomass characteristics. The results showed that the optimal PSO-NN model can accurately predict the properties of hydrochar, with a high R-2 value. The study also identified important factors such as carbon content, hydrothermal temperature, and nitrogen content that affect the properties of hydrochar.
Article
Energy & Fuels
Lin Mu, Shuaitan Wang, Zhende Zhai, Yan Shang, Chen Zhao, Liang Zhao, Hongchao Yin
JOURNAL OF THE ENERGY INSTITUTE
(2020)
Proceedings Paper
Energy & Fuels
Yan Shang, Ming Dong, Lin Mu, Xiaohua Liu, Xiaowan Huang, Sufen Li
INNOVATIVE SOLUTIONS FOR ENERGY TRANSITIONS
(2019)
Article
Thermodynamics
Yan Shang, Ming Dong, Sufen Li, Lin Mu
APPLIED THERMAL ENGINEERING
(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)
