Article
Physics, Fluids & Plasmas
Taylor Hanson, Marek Stastna, Aaron Coutino
Summary: Shear instability in the cabbeling regime results in increased efficiency of three-dimensional fluid mixing, caused by the creation of denser fluid through mixing of parcels with the same density but different temperature.
PHYSICAL REVIEW FLUIDS
(2021)
Article
Metallurgy & Metallurgical Engineering
Xiao-yan Zhang, Min Zhao, Lang Liu, Chao Huan, Ki-il Song, Mu-yan Xu, De Wen
Summary: The study investigates the thermal accumulation process of cemented tailings backfill (CTB) through numerical simulation, focusing on the effects of thermal accumulation time, slurry proportions, and temperature conditions. Results show that the total thermal accumulation capacity of CTB can increase by approximately 85% within 10-90 days. Surrounding rock temperature and initial temperature have a more significant impact on thermal accumulation capacity compared to slurry proportions, with surrounding rock temperature and initial temperature changes improving the capacity more effectively. Additionally, heat conduction plays a major role in the thermal accumulation process, with the average heat conduction capacity being approximately 25 times that of heat convection capacity.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2021)
Article
Thermodynamics
Hakim Kebabsa, Mohand Said Lounici, Ahmed Daimallah
Summary: The study introduces a novel concept of annular tower solar chimney power plant to improve the performance of the divergent tower system, showing a significant increase in power output. Simulation results indicate a strong sensitivity of flow behavior, power output and thermal efficiency to the changes in exterior and interior tower radius, with the best performance observed at the exterior radius of 17m and interior radius of 13m.
Article
Construction & Building Technology
L. G. Carreto-Hernandez, S. L. Moya, C. A. Varela-Boydo, A. Francisco-Hernandez
Summary: Passive strategies, such as wind towers, are used to reduce energy consumption and improve indoor environments in buildings. This study focuses on the performance of mixed convection in a wind tower-room system and provides insights into the optimal conditions for achieving comfort inside the room. Experimental results validate the numerical findings, and the results suggest that wind towers can achieve sensation-neutral comfort when outside temperatures are between 25 and 30 degrees Celsius.
BUILDING AND ENVIRONMENT
(2023)
Article
Thermodynamics
Silken Jones, Joseph Shepherd
Summary: This study investigates the thermal ignition of laminar external natural convection flows by vertical cylinders. The ignition threshold is found to have a weak dependence on surface area, in contrast to historical data. Among the multi-component fuels tested, JI is identified as the most appropriate surrogate for POSF-4658 Jet A.
COMBUSTION AND FLAME
(2021)
Article
Energy & Fuels
S. T. Paing, T. N. Anderson, R. J. Nates
Summary: Solar water heating systems can reduce energy demand for domestic water heating by improving the thermal performance of storage tanks. This study showed that using concentric baffles can effectively suppress natural convection and reduce standing heat loss in the tank.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Engineering, Electrical & Electronic
Lucas Andrade Militao, Bruno Bertoldi, Andre Giovani Leal Furlan, Marcelo Lobo Heldwein, Jader Riso Barbosa
Summary: Thermal network models are crucial for the design and optimization of power converters by providing accurate temperature predictions. This study developed thermal network models for magnetic components and validated them experimentally, proving their suitability for predicting temperature and enabling component optimization.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Environmental Sciences
Luke A. Pangle, Jeremy E. Diem, Richard Milligan, Ellis Adams, Allison Murray
Summary: Defects in sanitary-sewer infrastructure allow for the exchange of fluids with the environment. The intrusion of rainwater and groundwater into sanitary sewers, known as inflow and infiltration (I&I), has unknown impacts on streamflow in urban watersheds. Our study quantified the effects of I&I on streamflow using measured flows in sanitary-sewer pipes in four watersheds near Atlanta, Georgia, USA. We found that I&I substantially reduces flows in urban streams, especially during dry weather.
WATER RESOURCES RESEARCH
(2022)
Article
Construction & Building Technology
J. Antonio Castillo, Ramon Tovar, Guadalupe Huelsz
Summary: The study indicates that opening vents in a room with a window and a heat source can improve indoor thermal conditions by reducing temperature, with the case of three top vents being the most effective. These results provide valuable reference for natural ventilation design in buildings located in areas with low wind speed and heat sources near the floor.
BUILDING AND ENVIRONMENT
(2021)
Article
Green & Sustainable Science & Technology
Xiaolin Wang, Una Djakovic, Huashan Bao, Juan F. Torres
Summary: This study experimentally investigated the heat transfer performance and phase change behavior of six PCM capsules of varying shapes, with the red blood cell shape found to have the most rapid freezing and melting process. The results provide insights for future studies on cold thermal energy storage and applications.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2021)
Article
Physics, Applied
Mark A. George, Noboru Takamure, David R. McKenzie
Summary: This study investigates the radiative heat transfer in the coaxial geometry of evacuated tube solar collectors through theoretical and experimental analysis. The results suggest that the effective emissivity method is applicable in certain conditions, but the spectral distribution of the emitted radiation needs to be considered at high temperatures.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Multidisciplinary
Fabian Jan Schwarzendahl, Hartmut Loewen
Summary: This study investigates the cooling and heating process of self-propelled active colloids and discovers the Mpemba effect and activity-induced overcooling phenomenon.
PHYSICAL REVIEW LETTERS
(2022)
Article
Mechanics
K. Thirumalaisamy, Sivaraj Ramachandran
Summary: The objective of this study was to investigate the energy transmission rate's features of two types of nanofluids in a tilted square porous cavity under the influence of heat source/sink. The results showed that the shape and volume fraction of nanoparticles significantly affect the heat transfer rate. Moreover, the proper combination of nanoparticles can enhance the heat transfer characteristics of base fluids.
Article
Thermodynamics
E. Martin, F. Sastre, A. Velazquez, A. Bairi
Summary: The combination of porous media and nanofluids is used to enhance heat transfer around a vertical finned cylindrical antenna, with a new Nusselt-Rayleigh correlation proposed and quantified for different ranges of Rayleigh numbers. Results show significant improvements in Nusselt number compared to the reference case, with enhancements of up to 65% observed in the upper limit region of the span of Rayleigh numbers considered.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Energy & Fuels
Orhan Kalkan, Ali Celen, Kadir Bakirci
Summary: The thermal performance of a LiFePO4 pouch type battery under different discharge rates was experimentally and numerically investigated. It was found that natural convection cooling is not sufficient for the battery at high discharge rates.
JOURNAL OF ENERGY STORAGE
(2021)
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)