Article
Mechanics
Long Chen, Alban Potherat, Ming-Jiu Ni, Rene Moreau
Summary: High-resolution direct numerical simulations were conducted to study turbulent shear flow of liquid metal in a cylindrical container driven by an azimuthal Lorentz force. The simulations accurately reproduced experimental findings and revealed a transition to small scale turbulence at certain Reynolds numbers. The study also confirmed theoretical laws for cutoff scale and characteristics of sheared magnetohydrodynamics (MHD) turbulence.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Energy & Fuels
Ossama Abou Saima, Ahmed A. Abdel-Rehim
Summary: Phase Change Materials (PCMs) are used in thermal energy storage to address the lack of heat gain during night hours in solar thermal collectors. This study focuses on evaluating the charging and discharging period of PCM in water storage and determining the optimum size for efficient system performance.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Construction & Building Technology
Nessrine Essid, Anissa Eddhahak, Jamel Neji
Summary: This paper investigates the energy efficiency of PCM-concrete wallboards through experimental and numerical methods. The results show that PCMs play a key role in reducing indoor temperature and thermal fluctuations of different PCM-wallboards, with delayed temperature peaks emphasizing the enhanced energy efficiency of PCM-wallboards compared to traditional concrete, especially for bilayer wallboards.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Astronomy & Astrophysics
David Martinez-Gomez, Roberto Soler, Jaume Terradas, Elena Khomenko
Summary: This study investigates the effects of density inhomogeneities on the periods and damping times of kink oscillations in flux tubes. The results show that the period ratio of the fundamental mode to the first harmonic increases with an increase in the central-to-footpoint density ratio or a decrease in the average density.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Engineering, Chemical
Jianqing Wang, Jiajun Wang, Lian-Fang Feng
Summary: An integrated model combining computational fluid dynamics (CFD) with polymerization kinetics was developed for investigating the industrial styrene thermal polymerization process. The CFD model coupled with the comprehensive kinetic model provided more accurate and reliable predictions compared to the ideal reactor model. Optimization suggestions for operation conditions were also proposed.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Engineering, Aerospace
Deming Zhao, Zhisheng Cheng, Weiwei Zhang, Jinsheng Cui, He Wang
Summary: This paper presents a detailed thermal simulation analysis of the drilling process for icy soil in the lunar polar region. A multi-level particle size simulation model with a thermal sieve was developed to evaluate the temperature changes. The results show that the thermal conductivity of the sieve ranges from 100 to 400 W/m, and the addition of the thermal sieve significantly reduces the calculation time by 86%.
Article
Nuclear Science & Technology
Zhipeng Wang, Hong Xu, Chong Chen, Gang Hong, Zhenguo Song, Yaoli Zhang
Summary: This paper investigates the phenomenon of PRB convection in non-Boussinesq fluid-supercritical carbon dioxide using computational fluid dynamics simulation. The study finds that the inlet Reynolds number of the horizontal incoming flow significantly affects the PRB convection.
NUCLEAR ENGINEERING AND TECHNOLOGY
(2022)
Article
Thermodynamics
Xuebo Dong, Wei Chen, Qian Cheng, Yi Liu, Hao Dai
Summary: In this study, the thermal-hydraulic characteristics of steam-air in vertical corrugated tubes were numerically investigated under different conditions. It was found that the thermal-hydraulic performance is better in corrugated tubes with longer wavelength and higher amplitude waveform condensing walls under low inlet velocity. The study also identified the optimal geometric parameters for corrugated tubes in different velocity ranges.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Automation & Control Systems
Michael Storchak, Thomas Stehle, Hans-Christian Moehring
Summary: The study focused on the impact of thermal properties of machined materials on thermal machining characteristics, developing a methodology based on the determination of tangential stress. Thermal properties of the materials were calculated based on this stress and cutting temperature, with the developed FE cutting model achieving a deviation between experimental and simulated temperature values ranging from approximately 7.5% to 14.4%.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Green & Sustainable Science & Technology
Milad Teymori-omran, Ali Motevali, Seyed Reza Mousavi Seyedi, Mehdi Montazeri
Summary: The study utilized ANSYS Fluent for numerical simulation to improve energy consumption in greenhouse systems. The photovoltaic/thermal system was simulated under various parameters and compared for performance in indoor and outdoor conditions. The optimal design was identified as longitudinal 14 mm tubes with a flow rate of 3 lit/min, showing good agreement between experimental and simulation data.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2021)
Article
Thermodynamics
Xiaodong Ni, Chunsheng Weng, Han Xu, Qiaodong Bai
Summary: In this study, a symmetric two-phase detonation model and a cylinder heat conduction model were used to analyze the features of transient heat transfer in the detonation tube of a pulse detonation engine (PDE). The effects of tube material and size on heat transfer were investigated, with numerical results showing significant impact of inner flow and tube material on PDE wall temperature.
APPLIED THERMAL ENGINEERING
(2021)
Article
Energy & Fuels
Mahdi Momeni, Amir Fartaj
Summary: This paper introduces a novel PCM-to-air and liquid heat exchanger for thermal energy storage, which can provide a hybrid heat source and improve thermal system performance. Numerical simulations are used to analyze the heat transfer characteristics and phase change process, and the effect of airflow variation on the thermal response is studied. Experimental results demonstrate that the PCM can store and release excess heat during charging and discharging processes, providing extra heating time for the airside.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Thermodynamics
Amnart Boonloi, Withada Jedsadaratanachai
Summary: This study simulates laminar air flow and thermal configurations through a heat exchanger tube equipped with X-V baffles. The Reynolds number ranges from 100 to 2000 and a numerical method (finite volume analysis) is used. The effects of X-V baffle sizes, distances, and flow directions on flow and thermal profiles are discussed.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
M. Chatelain, M. Albaric, D. Pelletier, J. Veirman, E. Letty
Summary: This study improved a numerical method combining thermo-hydraulic simulations and a kinetic thermal donor (TD) formation model. By investigating different Cz growth processes, a more appropriate TD formation model was identified and its reliability was validated, providing insights for process optimization and furnace design to reduce TD concentrations.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2021)
Article
Energy & Fuels
Mohammad Saleh Barghi Jahromi, Vali Kalantar, Hadi Samimi Akhijahani, Hadi Kargarsharifabad, Shahin Shoeibi
Summary: In this study, an innovative solar air ventilator with phase change material has been used to increase the air outlet temperature of the system, showing great potential for wide application.
JOURNAL OF ENERGY STORAGE
(2023)