Senchun Miao^1,*, Wenkai Hu¹, Jiangbo Wu¹, Zhengjing Shen¹, Xiaoze Du^1,2,*

FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.7, pp. 1711-1735, 2025, DOI:10.32604/fdmp.2025.062239 - 31 July 2025

Abstract In Brayton cycle energy storage systems powered by supercritical carbon dioxide (sCO₂), compressors are among the most critical components. Understanding their internal flow loss characteristics is, therefore, essential for enhancing the performance of such systems. This study examines the main sCO₂ compressor from Sandia Laboratory, utilizing entropy production theory to elucidate the sources and distribution of energy losses both across the entire machine and within its key flow components. The findings reveal that turbulent viscous dissipation is the predominant contributor to total entropy production. Interestingly, while the relative importance of the entropy produced by various sources More >

Sergio Cassese¹, Riccardo Guida^2,3,*, Daniele Trincone¹, Stefano Mungiguerra¹, Raffaele Savino¹

FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.6, pp. 1299-1337, 2025, DOI:10.32604/fdmp.2025.065605 - 30 June 2025

Abstract Robust numerical tools are essential for enabling the use of hybrid rocket engines (HREs) in future space applications. In this context, Computational Fluid Dynamics (CFD) transient simulations can be employed to analyse and predict relevant fluid dynamics phenomena within the thrust chamber of small-scale HREs. This work applies such techniques to investigate two unexpected behaviours observed in a 10 N-class hydrogen peroxide-based hybrid thruster: an uneven regression rate during High-Density Polyethylene (HDPE) and Acrylonitrile Butadiene Styrene (ABS) fuel tests, and non-negligible axial consumption in the ABS test case. The present study seeks to identify their… More >

Mahmoud Bady¹, Fitrian Imaduddin^1,2, Iskander Tlili^1,*

FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.6, pp. 1339-1352, 2025, DOI:10.32604/fdmp.2025.065295 - 30 June 2025

Abstract This study explores the bioconvective behavior of a Reiner-Rivlin nanofluid, accounting for spatially varying thermal properties. The flow is considered over a porous, stretching surface with mass suction effects incorporated into the transport analysis. The Reiner-Rivlin nanofluid model includes variable thermal conductivity, mass diffusivity, and motile microorganism density to accurately reflect realistic biological conditions. Radiative heat transfer and internal heat generation are considered in the thermal energy equation, while the Cattaneo-Christov theory is employed to model non-Fourier heat and mass fluxes. The governing equations are non-dimensionalized to reduce complexity, and a numerical solution is obtained More >

Xiao Sun¹, Huifan Huang¹, Yanjuan Zhao^2,*, Lianghuai Tong^3,*, Haibin Lin³, Yuliang Zhang⁴

FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.6, pp. 1261-1298, 2025, DOI:10.32604/fdmp.2025.064329 - 30 June 2025

Abstract The reverse operation of existing centrifugal pumps, commonly referred to as “Pump as Turbine” (PAT), is a key approach for recovering liquid pressure energy. As a type of hydraulic machinery characterized by a simple structure and user-friendly operation, PAT holds significant promise for application in industrial waste energy recovery systems. This paper reviews recent advancements in this field, with a focus on pump type selection, performance prediction, and optimization design. First, the advantages of various prototype pumps, including centrifugal, axial-flow, mixed-flow, screw, and plunger pumps, are examined in specific application scenarios while analyzing their suitability… More >

Zhiqiang Jiang¹, Zili Li¹, Bin Liang², Miao He¹, Weishou Hu³, Jun Tang³, Chao Song⁴, Nanxin Zheng^5,*

FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.6, pp. 1397-1416, 2025, DOI:10.32604/fdmp.2025.062737 - 30 June 2025

Abstract Microbial polysaccharides, due to their unique physicochemical properties, have been shown to effectively enhance the stability of foam fracturing fluids. However, the combined application of microbial polysaccharides and surfactants under high-temperature and high-salinity conditions remain poorly understood. In this study, we innovatively investigate this problem with a particular focus on foam stabilization mechanisms. By employing the Waring blender method, the optimal surfactant-microbial polysaccharide blends are identified, and the foam stability, rheological properties, and decay behavior in different systems under varying conditions are systematically analyzed for the first time. The results reveal that microbial polysaccharides significantly More >

Li Niu¹, Yang Wang^1,*, Nan Lin², Yaoying Yue¹, Wenbin Fu¹, Elzat Tuhanjiang¹

FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.6, pp. 1473-1487, 2025, DOI:10.32604/fdmp.2025.062623 - 30 June 2025

Abstract With the widespread use of polyethylene (PE) materials in gas pipelines, the problem related to the aging of these pipes has attracted increasing attention. Especially under complex environmental conditions involving temperature, humidity, and pressure changes, PE pipes are prone to oxidative degradation, which adversely affects their performance and service life. This study investigates the aging behavior of PE pipes used for gas transport under the combined effects of temperature (ranging from 80°C to 110°C) and pressure (0, 0.1, 0.2, and 0.3 MPa). By assessing the characteristics and thermal stability of the aged pipes, relevant efforts… More >

Shourui Wang, Yibo Wang^*, Kun Yang, Yu Li, Xin Su

FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.6, pp. 1439-1457, 2025, DOI:10.32604/fdmp.2025.062295 - 30 June 2025

Abstract Hydrocolloids are widely used in meat products and pureed foods as they offer thickening and viscosity-enhancing effects that facilitate shaping and improve stability. In this study, the static shear rheological and dynamic viscoelastic properties of pumpkin puree (S) and pork mince (P) with the addition of various hydrocolloids were considered. Dedicated material printing experiments were conducted by means of a three-dimensional printing platform by using a coaxial dual-nozzle for sandwich composite printing of four different materials. In particular, the impact of different process parameters (printing speed 10~30 mm/s, filling density 10%~50%) was assessed in terms… More >

Manqing Qian^*, Xiyu Chen, Yongming Li

FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.6, pp. 1353-1377, 2025, DOI:10.32604/fdmp.2025.061652 - 30 June 2025

Abstract Shale reservoirs are characterized by numerous geological discontinuities, such as bedding planes, and exhibit pronounced heterogeneity across rock layers separated by these planes. Bedding planes often possess distinct mechanical properties compared to the surrounding rock matrix, particularly in terms of damage and fracture behavior. Consequently, vertical propagation of hydraulic fractures is influenced by both bedding planes and the heterogeneity. In this study, a numerical investigation into the height growth of hydraulic fractures was conducted using the finite element method, incorporating zero-thickness cohesive elements. The analysis explored the effects of bedding planes, toughness contrasts between layers,… More >

Xiaozong Song^*, Jiangbin Liu, Longhua Fei, Wencong Zhang

FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.6, pp. 1379-1396, 2025, DOI:10.32604/fdmp.2025.061222 - 30 June 2025

Abstract Ultra-precision components have been widely used to produce advanced optoelectronic equipment. The so-called Electric field enhanced UltraViolet-Induced Jet Machining (EUV-INCJM) is an ultra-precision method that can achieve sub-nanometer level surface quality polishing. This study focuses on the application of the EUV-INCJM with different nozzle structures to a single-crystal of silicon. Two kinds of electro-optic-liquid coupling nozzles with single-jet and multi-jet focusing structures are proposed accordingly. Simulations and experiments have been conducted to verify the material removal performance of these nozzles. The simulation results show that, under the same condition, the flow velocity of the single-jet… 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 >