Article
Engineering, Multidisciplinary
Younghwan Joo, Jaeho Jung, Minho Yoon
Summary: This study develops a two-dimensional design sensitivity analysis and topology optimization method for multi-objective problems considering both thermal insulation and structural stiffness. The obtained designs are both structurally reliable and thermally insulative, outperforming existing designs.
ENGINEERING OPTIMIZATION
(2023)
Article
Thermodynamics
Sihao Qian, Shunxi Lou, Chaoliu Ge, Wei Wang, Xiwei Tian, Yanzhao Cai
Summary: This study investigates the influence of temperature dependent fluid properties on the topology optimization of conjugate heat transfer. The coupling between fluid flow and heat transfer caused by non-isothermal flow is demonstrated by introducing functions of material TD properties. The results show that TD fluid properties will cause different topology optimization results and affect heat dissipation capacity, which cannot be neglected in topology optimization studies.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Engineering, Multidisciplinary
Jing Zheng, Xuanpei Rong, Chao Jiang
Summary: This paper proposes a thermoelastic topology optimization method that takes into account the temperature-dependent material properties. It formulates a mathematical model and algorithm to optimize the structure design considering these properties. Numerical examples are provided to demonstrate the effectiveness of the method and illustrate the significant influence of temperature-dependent material properties.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2023)
Article
Computer Science, Interdisciplinary Applications
Meisam Takalloozadeh, Gil Ho Yoon
Summary: This study investigates the optimal topology of structures under body forces, using a level-set-based topology optimization method. Instability during the optimization process is addressed, and a heuristic solution is proposed to overcome the challenge.
ENGINEERING COMPUTATIONS
(2021)
Article
Engineering, Multidisciplinary
Yuan Chen, Lin Ye, Y. X. Zhang, Chunhui Yang
Summary: This study investigates a novel multi-material topology optimization scheme considering temperature-dependent thermoelastic properties for engineering structure design. Results show that the temperature-dependent elastic modulus dominantly influences design outcomes, while the temperature-dependent thermal expansion coefficient plays a crucial role in material distribution and structural geometry.
ENGINEERING OPTIMIZATION
(2022)
Article
Thermodynamics
Joshua Palumbo, Omri Tayyara, Cristina H. Amon, Sanjeev Chandra
Summary: To achieve uniform flow distribution and improve heat transfer across a heat sink, researchers developed a liquid-cooled heat sink with a nontraditional internal geometry generated by density-based topology optimization. This topologically optimized heat sink, made through a novel thermal spray additive manufacturing method, demonstrated lower surface temperatures and reduced temperature non-uniformity compared to a heat sink with parallel channels.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Forestry
Susete Marques, Vladimir Bushenkov, Alexander Lotov, Jose G. Borges
Summary: This research introduces an innovative approach using integer programming to generate Pareto frontiers in order to address multiple objectives, locational specificity requirements, and product even-flow constraints in forest management planning. The method may enhance tradeoff analysis between ecosystem services in large-scale problems and help forest managers effectively balance demand for forest products in participatory management planning processes.
Article
Environmental Sciences
Adriano Mazziotta, Paulo Borges, Annika Kangas, Panu Halme, Kyle Eyvindson
Summary: Economically-oriented forestry aims to sustain timber harvest revenues, while ecologically-oriented management supplies suitable habitat for deadwood-dependent species. Planning for economic and ecological sustainability involves compromise and trade-offs. This study analyzes the spatial trade-offs between economic value from timber harvesting and volume of deadwood in boreal forests, considering landscape characteristics, forest management, and uncertainty in inventory errors.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Engineering, Multidisciplinary
Lei Tang, Tong Gao, Weitao Zhang, Jun Zeng, Weihong Zhang
Summary: This work addresses high temperature and large temperature gradient in the topology optimization of thermo-elastic structures for the first time. It breaks through the conventional assumption of constant material properties (CMPs) by considering temperature-dependent material properties (TDMPs) including thermal conductivity, elastic tensor, and coefficient of thermal expansion. Nonlinear heat conduction is implemented to provide varying temperature fields in thermoelasticity. The proposed approach is validated through numerical examples, showing that it produces optimized structures with high fidelity.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2023)
Article
Computer Science, Interdisciplinary Applications
Shuai Li, Yongcun Zhang, Shutian Liu, Shuhao Wu
Summary: This study presents a topology optimization method for thermoelastic structures under transient thermal loads, considering thermal stress constraints. The method can realize accurate optimization and effective stress control of transient thermoelastic structures. The temperature field and elastic responses are obtained by solving the transient thermal conductive equations and thermoelastic equations. The adjoint method is used to derive the sensitivity expressions. Three numerical examples are provided to illustrate the effectiveness and necessity of the proposed method. The results show that the adopted design method needs to accurately reflect the influence of transient effects on the structural response, which can be achieved by the method proposed in this paper.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2023)
Article
Ecology
Viktor Thunell, Anna Gardmark, Magnus Huss, Yngvild Vindenes
Summary: Body size-dependent physiological effects of temperature influence individual growth, reproduction, and survival, which govern animal population responses to global warming. In this study, a dynamic energy budget integral projection model (DEB-IPM) was developed to investigate how warming affects the optimal energy allocation and adaptation of size-structured organisms. The results show that increasing temperature leads to a decrease in optimal energy allocation to growth and induces changes in body size and population structure.
Article
Mathematics, Interdisciplinary Applications
Bram A. Siebert, James P. Gleeson, Malbor Asllani
Summary: This paper presents a targeted model of optimal social distancing on metapopulation networks, which can effectively reduce disease spreading while minimizing the impact on human mobility and related costs.
CHAOS SOLITONS & FRACTALS
(2022)
Article
Computer Science, Information Systems
Takumi Aotani, Taisuke Kobayashi, Kenji Sugimoto
Summary: The paper introduces a new loss function and multi-objective optimization problem to address the bias-variance trade-off in model learning. By adjusting hyperparameters, the bias-variance trade-off can be balanced to improve long-term prediction ability.
Article
Health Care Sciences & Services
Andrea J. Elhajj, Donna M. Rizzo, Gary C. An, Jaideep J. Pandit, Mitchell H. Tsai
Summary: The Acute Care Surgery model has been widely adopted in the United States, with this analysis evaluating its impact on General Surgery at the University of Vermont Medical Center. Utilizing three metrics and Pareto optimality, the study found that the post-tactical allocation front represented more optimal solutions for productivity and under-utilized time. Additionally, the post-tactical allocation front showed lower productivity but closer to the origin in terms of productivity and spillover time.
JOURNAL OF MEDICAL SYSTEMS
(2021)
Article
Materials Science, Multidisciplinary
Benjamin Vial, Yang Hao
Summary: The systematic design and analysis of electromagnetic metamaterials composed of dielectric inclusions in a ferroelectric matrix allow for enhanced effective tunability. Factors such as volume fraction, losses, and biasing field are investigated to understand the homogenized properties, while the photonic band diagram analysis provides insight into the frequency dependence of the anisotropic effective index and tunability. These metaceramics can be utilized in microwave antennas and components for increased reconfigurability and reduced power consumption in Electromagnetics and Photonics applications.
OPTICAL MATERIALS EXPRESS
(2021)
Article
Thermodynamics
Huilong Yan, Wenyao Zhang, Fang Qian, Panpan Guo, Qiuwang Wang, Cunlu Zhao
Summary: The study investigated the thermal interface material Ga62.5In21.5Sn16 sandwiched between filmed Cu substrates, revealing that decreasing surface roughness leads to improved wettability and thermal performance of the material. The thermal performance was found to be highly dependent on surface composition, with significant variations observed with changes in film thickness.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Chemistry, Analytical
Zhantao Wang, Xiaojuan Liu, Li Wang, Cunlu Zhao, Danfeng Zhou, Jiazheng Wei
Summary: This study reports for the first time the phenomenon of droplet trampolining using electrowetting and provides consistent results through experiments and simulations. The findings are important for applications that require vertical transportation of droplets or detachment of droplets from solid surfaces.
Article
Chemistry, Physical
Wenyao Zhang, Muhammad Farhan, Kai Jiao, Fang Qian, Panpan Guo, Qiuwang Wang, Charles Chun Yang, Cunlu Zhao
Summary: Nanofluidic systems show potential for thermoelectric conversion and fluid pumping using low-grade heat energy. This study investigates the effects of the structures and properties of nanofluidic systems on thermoelectric and thermoosmotic responses. The findings highlight the significance of these factors in enhancing performance.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Energy & Fuels
Syed Muhammad Ali Haider, Bagh Ali, Qiuwang Wang, Cunlu Zhao
Summary: This study numerically simulated the rotational flow of nanofluids containing SWCNT and SWCNT-MWCNT over a stretching sheet, finding that enhancing the rotational parameter and magnetic field can improve thermal transport efficiency. The hybrid nanofluid showed higher velocities, temperatures, and microorganism concentrations compared to the mono nanofluid.
Article
Engineering, Chemical
Huilong Yan, Wenyao Zhang, Yonghe Cui, Fang Qian, Dongmin Wei, Panpan Guo, Kai Jiao, Jin Huang, Qiuwang Wang, Cunlu Zhao
Summary: This study proposes a method for fabricating lubricant infused surfaces (LIS) on the inner walls of metal capillaries to achieve sustainable drag reduction and anti-corrosion properties. The experimental results show that LIS metal capillaries exhibit durable drag reduction and anti-corrosion characteristics, and the drag reduction performance can be effectively tuned by varying the viscosity of infusion lubricants.
CHEMICAL ENGINEERING SCIENCE
(2023)
Review
Energy & Fuels
Boudia Mohamed El Amine, Yi Zhou, Hongying Li, Qiuwang Wang, Jun Xi, Cunlu Zhao
Summary: Single-junction organic solar cells have achieved a power conversion efficiency of 20% through the use of narrow bandgap non-fullerene electron acceptor materials and large band gap electron donor materials. This efficiency improvement is due to efficient light harvesting in the near-infrared range and reduced energy losses with the most promising active layer layout, Bulk-Heterojunction. Ternary blending is currently the most advanced strategy for constructing Bulk-Heterojunction structures in organic solar cells.
Article
Chemistry, Physical
Kai Jiao, Huilong Yan, Fang Qian, Wenyao Zhang, Hongying Li, Qiuwang Wang, Cunlu Zhao
Summary: The use of ambient evaporation for power generation is a new concept of renewable energy harvesting. However, its development is hindered by the low output level, high cost of raw materials, and complex preparation. In this study, carbonized freeze-dried carrot pieces are proposed as a micro-scale porous network to generate electricity via evaporation-induced water flow. A single carrot piece can output stable voltage and current, and a commercial calculator can be powered by a series of four carrot pieces. This research provides a new perspective on renewable energy harvesting and promotes the use of biomass materials for energy generation.
JOURNAL OF POWER SOURCES
(2023)
Article
Physics, Applied
Syed Muhammad Ali Haider, Bagh Ali, Qiuwang Wang, Cunlu Zhao
Summary: This study examines the nanofluid flow with heat transfer on a stretching sheet using the Cattaneo-Christov heat flux. The influences of thermal and solutal buoyancy, activation energy, thermal radiation, and microorganism concentration are considered. The model of Buongiorno nanofluid is suggested to incorporate thermophoresis and Brownian motion effects. The 2D boundary layer PDEs are converted into 1D nonlinear ODEs and numerically analyzed using the RK-4 method. The results provide a reasonable assessment of the existing counterparts.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2023)
Article
Chemistry, Multidisciplinary
Wenyao Zhang, Xinxi Liu, Kai Jiao, Qiuwang Wang, Chun Yang, Cunlu Zhao
Summary: This study reveals a new thermoelectric mechanism that significantly enhances the thermoelectric response in nanoconfined electrolytes by coupling the ion steric effect and ion thermodiffusion in electric double layers.
Article
Thermodynamics
Chun Hu, Yonghe Cui, Wenyao Zhang, Fang Qian, Haiyan Wang, Qiuwang Wang, Cunlu Zhao
Summary: Physics-informed neural network (PINN) has gained attention for solving scientific computing problems. This paper proposes a PINN framework for solving conservative-form transport equations (PINNforCTE). PINNforCTE features accelerated back-propagation in the NN training due to low-order derivatives in the governing equations. The application of PINNforCTE in simulating lid-driven cavity flow and heat transfer is demonstrated, and it shows potential for significant acceleration in training and shortening of solution time compared to traditional PINN and finite element CFD method.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Chemistry, Physical
Kai Jiao, Wenyao Zhang, Rui Chuan, Huilong Yan, Anqi Zou, Qiuwang Wang, Chun Yang, Cunlu Zhao
Summary: An electric double layer (EDL) in a polyelectrolyte solution has distinct characteristics compared to those in simple electrolyte solutions. The EDL structures have different characteristic length scales for positively and negatively charged surfaces. The scaling law for the electrostatic energy stored in polyelectrolyte EDLs is different from that in electrolyte EDLs.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(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)