A coupled LBM-LES-DEM particle flow modeling for microfluidic chip and ultrasonic-based particle aggregation control method

Applied Mathematical Modelling, Journal Year: 2025, Volume and Issue: unknown, P. 116025 - 116025

Published: Feb. 1, 2025

Language: Английский

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Enhancing tungsten machinability via laser pretreatment for abrasive particles-based shear rheological polishing

Powder Technology, Journal Year: 2025, Volume and Issue: unknown, P. 120758 - 120758

Published: Feb. 1, 2025

Language: Английский

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Deposition Mechanism of Microscopic Impacting Droplets on Flexible Porous Substrates

International Journal of Mechanical Sciences, Journal Year: 2025, Volume and Issue: unknown, P. 110050 - 110050

Published: Feb. 1, 2025

Language: Английский

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Investigate on the Fluid Dynamics and Heat Transfer Behavior in an Automobile Gearbox Based on the LBM-LES Model

Lubricants, Journal Year: 2025, Volume and Issue: 13(3), P. 117 - 117

Published: March 10, 2025

With the rapid development of new energy vehicle market, demand for efficient, low-noise, low-energy consumption, high-strength, and durable gear transmission systems is continuously increasing. Therefore, it has become imperative to conduct in-depth research into fluid heat transfer lubrication dynamics within gearboxes. In systems, interaction between fluids solids leads complex nonlinear characteristics gears lubricants, making resolution gearbox thermodynamic models highly challenging. This paper proposes a model based on LBM-LES coupling study dynamic laws process. The results indicate that intense shear effects caused by high speeds generate vortices, which are particularly pronounced larger gears. mixing effect in these vortex regions better, achieving more uniform dissipation effect. Furthermore, flow lubricant closely related speed temperature. Under high-temperature conditions (such as 100 °C), diffusion range increases, forming wider oil film, but its viscosity significantly decreases, leading greater stirring losses. By optimizing selection lubricants parameters, efficiency reliability system can be further improved, extending service life. provides comprehensive analytical framework multi-stage clarifying mechanisms offering insights theoretical foundations future engineering applications this field.

Language: Английский

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Interlayer healing mechanism of multipath deposition 3D printing models and interlayer strength regulation method

Journal of Manufacturing Processes, Journal Year: 2025, Volume and Issue: 141, P. 1031 - 1047

Published: March 14, 2025

Language: Английский

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Numerical Investigations on the Effects of Inertia on the Startup Dynamics of a Multibladed Savonius Wind Turbine

Energies, Journal Year: 2025, Volume and Issue: 18(7), P. 1638 - 1638

Published: March 25, 2025

The startup dynamics of wind turbines have a direct impact on their cut-in speed and thus capacity factor, considering highly transient winds in urban environments. Due to the complex nature dynamics, published research it is severely lacking. Unless turbine are known, difficult evaluate its factor levelized cost energy (LCoE) for commercial viability. In this study, Savonius vertical-axis (VAWT) has been considered evaluated using numerical techniques. Moreover, effects inertia, arising from bearing frictional losses, generator load, etc., studied. Advanced computational fluid (CFD)-based solvers utilized purpose. flow-induced rotation blades modeled six degree freedom (6DoF) approach. Turbine inertia mass moment rotor systematically increased mimic additional losses due bearings generator. results indicate that significant VAWT. It was observed as increased, took longer reach steady or peak operational speed. Increasing by 10%, 20% 30% time taken rotational 13.3%, 16.7% 23.2%, respectively. An interesting observation obtained an increase does not change For considered, remained 122 rpm, tip ratio (TSR) 0.6 while increasing inertia.

Language: Английский

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Study on the Dynamic Characteristics of the Gear Lubrication Flow Field with Baffles and Optimization Design Strategies

Lubricants, Journal Year: 2025, Volume and Issue: 13(4), P. 143 - 143

Published: March 25, 2025

The gear transmission system occupies a core position in mechanical equipment due to its numerous advantages such as high efficiency, reliability, and long durability, making it an indispensable key component. Investigating the distribution mechanism of two-phase flow field systems optimization design strategies is crucial for enhancing efficiency reliability gearboxes. This paper couples Lattice Boltzmann Method (LBM) with Large Eddy Simulation (LES) construct dynamic modeling solution method suitable lubrication high-speed gears baffles. objective explore characteristics Based on LBM–LES coupled model, this sets up model field. By conducting detailed analysis evolution process gearbox presence baffles, study reveals changing patterns dynamics under different velocities configurations mixing components. research findings indicate that when radial speed reaches 8 m/s, stable oil film can be formed surface, which ensuring smooth operation reducing wear. Additionally, has been confirmed larger baffle diameters hole effectively increase enthalpy fluid, thereby optimizing energy transfer thermal performance. However, noted diameter not always better; exceeds certain limit, performance improvement effect gradually diminishes, indicating existence optimal value. baffle, dissipation fluid within controlled, improving management These provide valuable references high-tech fields aviation aerospace. They help relevant technicians gain deeper understanding complex mechanisms involved process, allowing more efficient reliable systems, entire system, promoting progress development related technological fields.

Language: Английский

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Abrasive Flow Material Removal Mechanism Under Multifield Coupling and the Polishing Method for Complex Titanium Alloy Surfaces

Processes, Journal Year: 2025, Volume and Issue: 13(2), P. 416 - 416

Published: Feb. 5, 2025

This study addresses the challenge of uneven surface quality on concave and convex regions during precision machining titanium alloy thin-walled complex curved components. An electrostatic field-controlled liquid metal-abrasive flow polishing method is proposed, which examined through both numerical simulations experimental investigations. Initially, a material removal model for under field control developed, with computational fluid dynamics (CFD) discrete phase models employed simulations. Subsequently, motion characteristics metal droplets varying amplitudes alternating electric fields are experimentally observed within processing channel. serves to validate effectiveness proposed in enhancing uniformity across Our results demonstrate that by controlling distribution strengths, roughness differences between surfaces workpiece reduced degrees. Specifically, group subjected 24 V field, difference minimized 58 nm, representing 44% reduction compared conventional abrasive polishing. These findings indicate significantly enhances areas

Language: Английский

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Computational Fluid Dynamics Simulation and Reaction Network Modelling for the Hydrothermal Liquefaction of Shorea Wood Sawdust

Energies, Journal Year: 2025, Volume and Issue: 18(5), P. 1145 - 1145

Published: Feb. 26, 2025

This study investigates the hydrothermal liquefaction (HTL) aqueous phase (AP) of Shorea sawdust in a semi-flow batch reactor, focusing on reaction network and computational fluid dynamics (CFD) simulation. High-performance liquid chromatography (HPLC) was used to detect lignocellulosic decomposition compounds, revealing presence glucose, galactose, xylose, furfural, ethanol, other undefined compounds due decomposition. Reaction ordinate (R0) indicates that progresses steadily as time increases, higher temperature leads greater ordinate, agreeing with Arrhenius’ assumption gained energy enables molecules overcome activation barrier. However, saccharide C6 C5 yield at 220 °C fluctuates suggesting secondary reactions. A kinetic model built based network, which developed HPLC results. Arrhenius parameters revealed is influenced by time, whereas ethanol production are dependent. In contrast, glucose formation both temperature. The prediction yields confirmed optimal for production, balancing slow reactions rapid degradation. CFD simulations show uniform pressure distribution inside chamber high localised input (1570 Pa). addition, feedstock particles tend distribute along wall because laminar flow, consistent observation experiment. findings highlight intricate relationship between conditions composition HTL product, contributing more comprehensive understanding process.

Language: Английский

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Investigation of Flow Characteristics in Rotating Distributary and Confluence Cavities

Energies, Journal Year: 2025, Volume and Issue: 18(5), P. 1287 - 1287

Published: March 6, 2025

Power generation is an important part of air vehicle energy management when developing long-endurance and reusable hypersonic aircraft. In order to utilize turbine power system on board, fuel-based rotating cooling has been researched cool the turbine’s rotor blades. For fuel-cooling turbines, each blade corresponds a separate channel. All channels cross together form distributary cavity confluence in center disk. determine flow characteristics cavities, computational fluid dynamics (CFD) simulations using shear–stress–transport turbulence model were carried out under conditions different speeds mass rates. The results showed great differences between non-rotating cavities. cavities rotational velocity, with obvious layering distribution regularity. Moreover, high-speed surface formed original structure, due combined functions centrifugal force, inertia, Coriolis force. Great pressure loss occurs passes through surface. This increases increase speed rate. Finally, four structures compared, optimal structure separated outlet channel was identified as best eliminate this loss.

Language: Английский

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