Open Access

REVIEW

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 >

View

1217

Download

626

Open Access

ARTICLE

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
（This article belongs to the Special Issue: High-speed, High-enthalpy and Reacting Flows and Related Material Science)
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 >

View

641

Download

264

Open Access

ARTICLE

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 >

View

489

Download

190

Open Access

ARTICLE

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
（This article belongs to the Special Issue: Fluid and Thermal Dynamics in the Development of Unconventional Resources II)
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 >

View

802

Download

263

Open Access

ARTICLE

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 >

View

790

Download

281

Open Access

ARTICLE

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
（This article belongs to the Special Issue: Fluid and Thermal Dynamics in the Development of Unconventional Resources II)
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 >

View

852

Download

345

Open Access

ARTICLE

Weiyang Xie^1,2, Cheng Chang^1,2, Ziqin Lai^1,2,*, Sha Liu^1,2, Han Xiao^1,2
FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.6, pp. 1417-1438, 2025, DOI:10.32604/fdmp.2025.060956 - 30 June 2025
Abstract In the context of post-stimulation shale gas wells, the terms “shut-in” and “flowback” refer to two critical phases that occur after hydraulic fracturing (fracking) has been completed. These stages play a crucial role in determining both the well’s initial production performance and its long-term hydrocarbon recovery. By establishing a comprehensive big data analysis platform, the flowback dynamics of over 1000 shale gas wells were analyzed in this work, leading to the development of an index system for evaluating flowback production capacity. Additionally, a shut-in chart was created for wells with different types of post-stimulation fracture More >

View

707

Download

249

Open Access

ARTICLE

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 >

View

764

Download

274

Open Access

ARTICLE

Baoyu Chen^1,2, Meina Li³, Jicheng Zhang¹, Wenguo Ma^1,*, Yueqi Wang¹, Tianchen Pan¹, Xuan Liu¹
FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.6, pp. 1459-1471, 2025, DOI:10.32604/fdmp.2025.060255 - 30 June 2025
Abstract The relative permeability of oil and water is a key factor in assessing the production performance of a reservoir. This study analyzed the impact of injecting a viscosity reducer solution into low-viscosity crude oil to enhance fluid flow within a low-permeability reservoir. At 72°C, the oil-water dispersion solution achieved a viscosity reduction rate (f) of 92.42%, formulated with a viscosity reducer agent concentration (C_VR) of 0.1% and an oil-water ratio of 5:5. The interfacial tension between the viscosity reducer solution and the crude oil remained stable at approximately 1.0 mN/m across different concentrations, with the minimum More >

View

838

Download

245

Open Access

ARTICLE

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 >

View

960

Download

403

Open Access

ARTICLE

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 >

View

748

Download

225

Open Access

ARTICLE

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 >

View

864

Download

254