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  • Open Access

    ARTICLE

    Thermal Properties Reconstruction and Temperature Fields in Asphalt Pavements: Inverse Problem and Optimisation Algorithms

    Zhonghai Jiang1, Qian Wang1, Liangbing Zhou2,*, Chun Xiao3
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2023.025270
    (This article belongs to this Special Issue: Computational Mechanics and Fluid Dynamics in Intelligent Manufacturing and Material Processing)
    Abstract A two-layer implicit difference scheme is employed in the present study to determine the temperature distribution in an asphalt pavement. The calculation of each layer only needs four iterations to achieve convergence. Furthermore, in order to improve the calculation accuracy a swarm intelligence optimization algorithm is also exploited to inversely analyze the laws by which the thermal physical parameters of the asphalt pavement materials change with temperature. Using the basic cuckoo and the gray wolf algorithms, an adaptive hybrid optimization algorithm is obtained and used to determine the relationship between the thermal diffusivity of two types of asphalt pavement materials… More >

  • Open Access

    ARTICLE

    Analysis of a Water-Cooled Unit under Different Loads

    Daoming Shen1,*, Jinhong Xia1, Chao Gui1, Songtao Xue2
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2023.024925
    (This article belongs to this Special Issue: Computational Mechanics and Fluid Dynamics in Intelligent Manufacturing and Material Processing)
    Abstract In order to ensure the safe operation of the compressors used in water chillers, in the present study some interlock protections have been added to the related design. These include a low pressure protection, a high pressure protection, an exhaust temperature protection and a differential pressure protection. Some tests have been conducted by tuning the saturation suction and exhaust temperatures of the compressor through adjustment of the cold source outlet temperature and the ambient temperature. The results show that the ambient temperature increases with decreasing device load and increasing fan speed under the same saturated suction temperature; the device refrigerating… More >

  • Open Access

    ARTICLE

    Theoretical and Experimental Analysis of Heat Transfer and Condensation in Micro-Ribbed Tubes

    Daoming Shen1,*, Jinhong Xia1, Chao Gui1, Songtao Xue2
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2023.024924
    (This article belongs to this Special Issue: Computational Mechanics and Fluid Dynamics in Intelligent Manufacturing and Material Processing)
    Abstract The thermal transmission coefficient for a micro-ribbed tube has been determined using theoretical relationships and the outcomes of such calculations have been compared with experiments conducted using a R1234yf refrigerant undergoing condensation. In particular four theoretical single-phase flow and three multi-phase flow models have been used in this regard. The experimental results show that: the Oliver et al. criterion equation overestimates the experimental results as its accuracy is significantly affected by the specific conditions realized inside micro-fin tubes; the Miyara et al. criterion equation prediction error is less than 15%; the Cavallini et al. approach gives the highest prediction accuracy;… More >

  • Open Access

    ARTICLE

    Analysis and Optimization of Flow-Guided Structure Based on Fluid-Structure Interaction

    Yue Cui1,*, Liyuan Wang2, Jixing Ru3, Jian Wu1
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2023.024873
    (This article belongs to this Special Issue: Computational Mechanics and Fluid Dynamics in Intelligent Manufacturing and Material Processing)
    Abstract Gases containing sulfur oxides can cause corrosion and failure of bellows used as furnace blowers in high-temperature environments. In order to mitigate this issue, the behavior of an effective blast furnace blower has been examined in detail. Firstly, the Sereda corrosion model has been introduced to simulate the corrosion rate of the related bellows taking into account the effects of temperature and SO2 gas; such results have been compared with effective measurements; then, the average gas velocity in the pipeline and the von Mises stress distribution of the inner draft tube have been analyzed using a Fluid-Structure Interaction model. Finally,… More >

  • Open Access

    ARTICLE

    Modeling Date Palm Trunk Fibers (DPTF) Packed Bed Adsorption Performances for Cadmium Removal from Aqueous Wastewater

    Ahmad S. Awad1.*, Banan Hudaib2, Waid Omar2
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2023.024300
    Abstract In this study, the potential of a low-cost bio-adsorbent, taken directly from Date Palm Trunk Fibers (DPTF) agricultural wastes, for cadmium ions removal from wastewaters is examined. The performances of this adsorbent are evaluated by building breakthrough curves at different bed heights and flow rates while keeping other parameters, such as the initial feed concentration, pH, and particle size, constant. The results indicate that the maximum cadmium adsorption capacity of DTPF can be obtained from the Thomas model as 51.5 mg/g with the most extended mass transfer zone of 83 min at the lowest flow rate at 5 ml/min. The… More >

  • Open Access

    ARTICLE

    Numerical Analysis of Cavity-Based Control of Base Pressure Variations at Supersonic Mach Numbers

    Ridwan1, Sher Afghan Khan1,*, Jaffar Syed Mohamed Ali1, Mohd. Azan Mohammed Sapardi1, Abdul Aabid2
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2023.025230
    (This article belongs to this Special Issue: Materials, Energy, and Fluid Dynamics)
    Abstract In the present study, the base pressure variations induced by the presence of a cavity, known to have a strong influence of the behaviour of supersonic projectiles, are investigated through numerical solution of the balance equations for mass, momentum, and energy. An area ratio of four is considered and numerical simulations are carried out at Mach M = 1.2, 1.4, 1.6, and 1.8 assuming no cavity or cavity locations 0.5D, 1D, 1.5D, and 2D. The inlet pressure of the nozzle is considered as a flow variable. The Taguchi method is also used, and the considered cases are then analyzed using… More >

  • Open Access

    ARTICLE

    Optimization of Anti-Collapse Drilling Fluid Systems with High Potassium Content

    Yu Xia1, Jian Guan4, Yong Gao5, Shanfa Tang1,2,3,*, Jialuo Rong1
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2023.025263
    Abstract The ash mudstone in some oil formations is highly water-sensitive. The oil formation is fractured, and the risk of well leakage and collapse is not negligible. This study presents a countermeasure for well collapse prevention, based on a “force-chemistry synergistic balance” approach and the utilization of environmentally friendly and efficient hydration inhibitors. The relevance of this approach is demonstrated considering a drilling fluid system with the high potassium content. The analysis shows that the system can maintain good rheological properties, filtration loss and suspension stability even after aging at 130°C for 16 h. The primary roll recovery of rock chips… More >