Junying Wei¹, Guangxian Yin², Jihao Zhang², Wenwen Chang², Chenrui Zhang², Zhengyi Li¹, Long Chang¹, Minghan Peng^3,*

Frontiers in Heat and Mass Transfer, Vol.23, No.4, pp. 1185-1201, 2025, DOI:10.32604/fhmt.2025.067244 - 29 August 2025

Abstract The scroll expander, as the core component of the micro-compressed air energy storage and power generation system, directly affects the output efficiency of the system. Meanwhile, the scroll profile plays a central role in determining the output performance of the scroll expander. In this study, in order to investigate the output characteristics of a variable cross-section scroll expander, numerical simulation and experimental studies were conducted by using Computational Fluid Dynamics (CFD) methods and dynamic mesh techniques. The impact of critical parameters on the output performance of the scroll expander was analyzed through the utilization of… More >

Haifeng Zhu^1,*, Zhenyu Chen^1,*, Teng Lu¹, Xiaoqin Zhi²

Frontiers in Heat and Mass Transfer, Vol.23, No.4, pp. 1303-1321, 2025, DOI:10.32604/fhmt.2025.065830 - 29 August 2025

Abstract To meet the demand for miniaturized, compact, high-reliability, and long-life cryocoolers in small satellite platforms, the development of a linear Stirling cryocooler has been undertaken. Computational Fluid Dynamics (CFD) numerical simulation software was used to conduct simulation analyses, verifying the impact of porous media channel layout, eccentricity, viscous resistance coefficient of the porous media, and piston position on the designed aerostatic bearing piston employing self-supplied gas bearing technology. The calculation results indicate that both the aerostatic force and leakage increase synchronously with eccentricity, while the two designed gas lift channel layouts are capable of providing… More >

Wei Shi^1,2, Shusheng Xiong^1,2,3,*, Wei Li^2,3, Kai Meng⁴, Qingsheng Liu⁴

Energy Engineering, Vol.122, No.9, pp. 3507-3523, 2025, DOI:10.32604/ee.2025.065579 - 26 August 2025

Abstract In the realm of all-electric aircraft research, the integration of cathode-open proton exchange membrane fuel cells (PEMFC) with lithium batteries as a hybrid power source for small to medium-sized unmanned aerial vehicles (UAVs) has garnered significant attention. The PEMFC, serving as the primary energy supply, markedly extends the UAV’s operational endurance. However, due to payload limitations and spatial constraints in the airframe layout of UAVs, the stack requires customized adaptation. Moreover, the implementation of auxiliary systems to facilitate cold starts of the PEMFC under low-temperature conditions is not feasible. Relying solely on thermal insulation measures… More >

Jingao Wu^1,2, Yong Fan^1,2,*, Zhendong Leng^1,3, Guangdong Yang^1,2

CMES-Computer Modeling in Engineering & Sciences, Vol.144, No.1, pp. 811-839, 2025, DOI:10.32604/cmes.2025.065632 - 31 July 2025

Abstract The formation process of blasting craters and blasting fragments is simulated using the continuum-discontinuum element method (CDEM), providing a reference for blasting engineering design. The calculation model of the blasting funnel is established, and the formation and fragmentation effect of the blasting crater under different explosive burial depths and different explosive package masses are numerically simulated. The propagation law of the explosion stress wave and the formation mechanism of the blasting crater are studied, and the relationship between the rock-crushing effect and blasting design parameters is quantitatively evaluated. Comparing the results of numerical simulation with… More >

Xin Wan¹, Shuyi Li^2,3, Tiankui Guo^2,3,*, Ming Chen^2,3, Xing Yang^2,3, Guchang Zhang^2,3, Zi’ang Wang^2,3

Energy Engineering, Vol.122, No.8, pp. 3013-3039, 2025, DOI:10.32604/ee.2025.066033 - 24 July 2025

Abstract Hydraulic fracturing is a key technology for the efficient development of deep oil and gas reservoirs. However, fracture propagation behavior is influenced by rock elastoplasticity and thermal stress, making it difficult for traditional linear elastic models to accurately describe its dynamic response. To address this, this study employs the Continuum-Discontinuum Element Method (CDEM), incorporating an elastoplastic constitutive model, thermo-hydro-mechanical (THM) coupling effects, and cohesive zone characteristics at the fracture tip to establish a numerical model for hydraulic fracture propagation in deep elastoplastic reservoirs. A systematic investigation was conducted into the effects of fluid viscosity, reservoir… More > Graphic Abstract

Liqiong Chen¹, Jie Pang¹, Kai Zhang^1,*, Juemei Pang², Haonan Liu³, Quan Fang¹

Structural Durability & Health Monitoring, Vol.19, No.4, pp. 937-952, 2025, DOI:10.32604/sdhm.2025.063177 - 30 June 2025

Abstract In order to reduce the ecological environmental pollution and economic losses caused by oil spill accidents from cross-river oil pipelines, this paper studies the structures of oil containment booms used for intercepting oil spills in rapid rivers and proposes a new type of double-layer hole oil containment boom. By establishing a solid mechanics model, the geometric deformation and stress-strain distribution patterns of the double-layer hole oil containment boom under rapid flow velocities were analyzed. Additionally, the impact of the skirt angle, hole size, and porosity on the mechanical properties of the new oil containment boom More >

Li-Li Wang^*, Hong-Xing Qin, Nan Dong

FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.6, pp. 1489-1503, 2025, DOI:10.32604/fdmp.2025.061154 - 30 June 2025

Abstract The so-called close-coupled gas atomization process involves melting a metal and using a high-pressure gas jet positioned close to the melt stream to rapidly break it into fine, spherical powder particles. This technique, adapted for blast furnace slag granulation using a circular seam nozzle, typically aims to produce solid slag particles sized 30–140 µm, thereby allowing the utilization of slag as a resource. This study explores the atomization dynamics of liquid blast furnace slag, focusing on the effects of atomization pressure. Primary atomization is simulated using a combination of the Volume of Fluid (VOF) method… More >

Yongsheng Wang^1,2, Xiangwu Lu¹, Wei Yuan^1,*, Lei Zhang¹

FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.6, pp. 1505-1528, 2025, DOI:10.32604/fdmp.2025.061052 - 30 June 2025

Abstract This study explores the influence of rotor blade angle on stall inception in an axial fan by means of numerical simulations grounded in the Reynolds-Averaged Navier-Stokes (RANS) equations and the Realizable k-ε turbulence model. By analyzing the temporal behavior of the outlet static pressure, along with the propagation velocity of stall inception, the research identifies distinct patterns in the development of stall. The results reveal that stall inception originates in the second rotor impeller. At a blade angle of 27°, the stall inception follows a modal wave pattern, while in all other cases, it assumes the More >

Hongen Li, Hongjuan Ren^*, Cong Li, Yecui Yan

Frontiers in Heat and Mass Transfer, Vol.23, No.3, pp. 921-941, 2025, DOI:10.32604/fhmt.2025.066512 - 30 June 2025

Abstract The flow field architecture of the proton exchange membrane fuel cell (PEMFC) cathode critically determines its performance. To enhance PEMFC operation through structural optimization, trapezoidal obstacles were implemented in the cathode flow channels. The height dependence of these obstacles was systematically investigated, revealing that a 0.7 mm obstacle height enhanced mass transfer from channels to the gas diffusion layer (GDL) compared to conventional triple-serpentine designs. This configuration achieved a 12.08% increase in limiting current density alongside improved water management. Subsequent studies on obstacle distribution density identified 75% density as optimal, delivering maximum net power density More >

Zerui Chen^*, Xin Wu, Houpeng Hu, Yang Zhou, Shang Yang

Frontiers in Heat and Mass Transfer, Vol.23, No.3, pp. 991-1011, 2025, DOI:10.32604/fhmt.2025.065936 - 30 June 2025

Abstract As the integration of electronic components in high-performance servers increases, heat generation significantly impacts performance and raises failure rates. Therefore, heat dissipation has become a critical concern in electronic circuit design. This study uses numerical simulations to investigate the heat dissipation characteristics of electronic components in air-cooled servers. By adjusting airflow speed, heat sink configurations, and the arrangement of straight-fin heat sinks, we optimize heat dissipation performance and analyze the mechanisms at different airflow speeds. The results show that, at the same airflow speed, the temperature of the heat sink is lower than that of… More >