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  • Open Access

    ARTICLE

    THERMAL BEHAVIOR OF LITHIUM-ION BATTERIES: AGING, HEAT GENERATION, THERMAL MANAGEMENT AND FAILURE

    Daniela Galatroa,*, Maan Al-Zareera , Carlos Da Silvaa , David A. Romeroa , Cristina H. Amona

    Frontiers in Heat and Mass Transfer, Vol.14, pp. 1-18, 2020, DOI:10.5098/hmt.14.17

    Abstract This work presents a succinct review of the thermal behavior of lithium-ion batteries (LIBs) and its relationship with aging, heat generation, thermal management and thermal failure. This work focuses on the temperature effects that promote the main aging mechanisms in the anode and compare these effects among different cell chemistries for calendar and cycling aging modes. We review the strategies to mitigate aging, including the design of the battery thermal management system (BTMS), best practices of battery users to minimize the effect of stress factors, and the appropriate selection of the anode material. We discuss More >

  • Open Access

    ARTICLE

    Numerical Investigation of the Thermal Behavior of a System with a Partition Wall Incorporating a Phase Change Material

    Nisrine Hanchi*, Hamid Hamza, Jawad Lahjomri, Khalid Zniber, Abdelaziz Oubarra

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.5, pp. 1227-1236, 2023, DOI:10.32604/fdmp.2023.022530

    Abstract The work deals with the thermal behavior of a conventional partition wall incorporating a phase change material (PCM). The wall separates two environments with different thermal properties. The first one is conditioned, while the adjacent space is characterized by a temperature that changes sinusoidally in time. The effect of the PCM is assessed through a comparative analysis of the cases with and without PCM. The performances are evaluated in terms of dimensionless energy stored within the wall, comfort temperature and variations of these quantities as a function of the amount of PCM and its emplacement. More >

  • Open Access

    ARTICLE

    Preparation and Properties of Chinese Lacquer Modified by Methylolureas

    Qiang Xiao1,2, Yanjun Cao1,2, Hailu Tan1,2, Qiaoling Feng1,2, Xinyue Gu1,2, Jianhua Lyu1,2, Hui Xiao1,2, Ming Chen1,2,*, Yuzhu Chen1,2,*

    Journal of Renewable Materials, Vol.11, No.2, pp. 1003-1016, 2023, DOI:10.32604/jrm.2022.023621

    Abstract In this study, different molar of methylolureas (MMU) were used to improve the properties and drying speed of the raw lacquer (RL). The drying time, gloss, pencil hardness and impact resistance of the lacquer film were tested. The thermal behaviors and chemical structures of the lacquer membrane were also discussed by thermal gravimetric analysis (TGA), fourier infrared spectrometer (FT-IR) and nuclear magnetic resonance (NMR) analysis, respectively. The results demonstrated that lower molar ratio MMU can significantly improve the properties of lacquer. The TGA analysis showed that the modified lacquer had high thermal stability than that More > Graphic Abstract

    Preparation and Properties of Chinese Lacquer Modified by Methylolureas

  • Open Access

    ARTICLE

    Simulation of the Hygrothermal Behavior of a Building Envelope Based on Phase Change Materials and a Bio-Based Concrete

    Dongxia Wu1, Mourad Rahim1, Wendong Li1, Mohammed El Ganaoui1,*, Rachid Bennacer2

    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.5, pp. 1483-1494, 2022, DOI:10.32604/fdmp.2022.021917

    Abstract Phase Change Materials (PCMs) have high thermal inertia, and hemp concrete (HC), a bio-based concrete, has strong hygroscopic behavior. In previous studies, PCM has been extensively combined with many materials, however, most of these studies focused on thermal properties while neglecting hygroscopic aspects. In this study, the two materials have been combined into a building envelope and the related hygrothermal properties have been studied. In particular, numerical studies have been performed to investigate the temperature and relative humidity behavior inside the HC, and the effect of adding PCM on the hygrothermal behavior of the HC.… More >

  • Open Access

    ARTICLE

    Cellulose Nanocrystal from Washingtonia Fibre and Its Characterization

    Mohammad Jawaid1, Lau Kia Kian1, Hassan Fouad2, Ramzi Khiari3,4,5,*, Othman Y. Alothman6, Mohamed Hashem7

    Journal of Renewable Materials, Vol.10, No.6, pp. 1459-1470, 2022, DOI:10.32604/jrm.2022.018415

    Abstract Cellulose nanocrystal (CNC) is a biomaterial derived from plant lignocellulosic components, widely applied in various industrial fields. Concurrently, with the growth of awareness in developing green nanomaterial, the explored Washingtonia fibre could be alternative biomass for obtaining CNC products. In the present work, different acid concentrations of 5%, 15%, and 25% hydrochloric solutions were employed to produce CNCs from Washingtonia fibre. With the chemical treatments, the yield of the CNC product was successfully retained at 21.6%−25.1%. Individually separated and needle-shaped CNC particles could be observed under the microscopic viewing with the increased acid concentrations. From… More > Graphic Abstract

    Cellulose Nanocrystal from <i>Washingtonia</i> Fibre and Its Characterization

  • Open Access

    ARTICLE

    Analysis of the Thermal Behavior of a Lithium Cell Undergoing Thermal Runaway

    Qifei Du1, Zhigang Fang2,3,*

    FDMP-Fluid Dynamics & Materials Processing, Vol.17, No.5, pp. 887-898, 2021, DOI:10.32604/fdmp.2021.016265

    Abstract This study examines the thermal runaway of a lithium ion battery caused by poor heat dissipation performances. The heat transfer process is analyzed on the basis of standard theoretical concepts. Water mist additives are considered as a tool to suppress the thermal runaway process. The ensuing behaviour of the battery in terms of surface temperature and heat generation is analyzed for different charge and discharge rates. It is found that when the remaining charge is 100%, the heat generation rate of the battery is the lowest, and the surface temperature with a 2C charge rate More >

  • Open Access

    ARTICLE

    Simulating the Turbulent Hydrothermal Behavior of Oil/MWCNT Nanofluid in a Solar Channel Heat Exchanger Equipped with Vortex Generators

    Rachid Maouedj1, Younes Menni2, Mustafa Inc3,4,*, Yu-Ming Chu5,6,*, Houari Ameur7, Giulio Lorenzini8

    CMES-Computer Modeling in Engineering & Sciences, Vol.126, No.3, pp. 855-889, 2021, DOI:10.32604/cmes.2021.014524

    Abstract Re-engineering the channel heat exchangers (CHEs) is the goal of many recent studies, due to their great importance in the scope of energy transport in various industrial and environmental fields. Changing the internal geometry of the CHEs by using extended surfaces, i.e., VGs (vortex generators), is the most common technique to enhance the efficiency of heat exchangers. This work aims to develop a new design of solar collectors to improve the overall energy efficiency. The study presents a new channel design by introducing VGs. The FVM (finite volume method) was adopted as a numerical technique… More >

  • Open Access

    ABSTRACT

    Hygro-Thermal Behaviors of an ACF-typed Ultra-thin Chip-on-Flex Interconnect Technology

    Hsien-Chie Cheng, Ho-hsiang Huang, Su-Tsai Lu, Wen-Hwa Chen

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.2, pp. 57-58, 2011, DOI:10.3970/icces.2011.019.057

    Abstract Due to the strong demand of electronic products with light-weight, flexibility and portability and rollability from consumers, the development of flexible electronics with flexible interconnects is presently underway. Flexible electronics is a technology that extends electronics devices beyond the rigid form factor. It is highly recognized that it can bring a very vigorous drive toward the new flourish of economic growth in the electronics industry.
    In the study, a flexible interconnect technology based on an ultra thin chip and a very thin flexible polyimide (PI) circuited substrate is developed, as shown in Fig. 1. The… More >

  • Open Access

    ARTICLE

    Investigation in the Effects of Configuration Parameters on the Thermal Behavior of Novel Conical Friction Plate in Continuously Sliding Condition

    Yanzhong Wang1, Xiangyu Wu1,*

    CMC-Computers, Materials & Continua, Vol.56, No.3, pp. 353-363, 2018, DOI: 10.3970/cmc.2018.03714

    Abstract To investigate the effects of configuration parameters and operation condition on the thermal behavior of novel conical friction plate, a three-dimensional finite element model of conical friction plate is established for numerical simulation. The conical surface configuration and friction heat generation of novel conical friction surfaces are discussed. The results indicate that the thermal behavior of the conical friction plate during continuously sliding period is influenced by the conical surface configuration. Maximum temperature occurs in the conical friction plate with cone angle of 24°. The maximum temperature value of friction plate is increased 7.4°C, when More >

  • Open Access

    ARTICLE

    Thermal Behavior of a U-shaped Channel Subject to a Convective Air Jet and Immersed in an Isothermal Medium

    Meryem NAOUM1, Mustapha EL ALAMI2

    FDMP-Fluid Dynamics & Materials Processing, Vol.12, No.2, pp. 56-68, 2016, DOI:10.3970/fdmp.2016.012.056

    Abstract A numerical study of mixed convection from a U-shaped channel is carried out. The flow is considered two dimensionnel. The inlet opening is adjusted in the right vertical part of the channel, while the outlet one is placed on the left vertical part. Navier–Stokes equations are solved using a control volume method and the SIMPLEC algorithm is considered for the treatment of pressure–velocity coupling. Special emphasis is given to detail the effect of the Reynolds and Rayleigh numbers on the heat transfer generated by mixed convection. The results are given for the parameters of control More >

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