Study on the Bubble Collapse Characteristics and Heat Transfer Mechanism of the Microchannel Reactor

Processes, Journal Year: 2025, Volume and Issue: 13(1), P. 281 - 281

Published: Jan. 20, 2025

Microreactors have the advantages of high heat and mass transfer efficiency, strict control reaction parameters, easy amplification, good safety performance, been widely used in various fields such as chip manufacturing, fine chemicals, biomanufacturing. However, narrow microchannels microreactors often become filled with catalyst particles, leading to blockages. To address this challenge, study proposes a multiphase flow model based on lattice Boltzmann method (LBM) investigate dynamic changes during bubble collapse process temperature distribution regularities. Based developed three-phase dynamics model, delves into shock evolution analyzes Then, patterns under different particle density conditions are explored. The found that action wave, stable structure liquid film is destroyed, deforms collapses. At moment collapse, energy rapidly transferred from potential kinetic field. Subsequently, converted pressure waves. This results rapid generation extremely field, creating high-velocity jets intense turbulent vortices, which can enhance effects flows. certain phenomenon will be formed at region relatively chaotic random. waves generated significant impact motion trajectories while influence high-density particles small. offer theoretical basis for understanding mechanisms flow. Moreover, these findings practical implications advancing technologies industrial applications, including manufacturing chemical transport.

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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Fully Self-Healing Dual-Mode Tactile Sensing Strategy for Object's Dimension and Surface Morphology Recognition

Nano Energy, Journal Year: 2025, Volume and Issue: unknown, P. 110757 - 110757

Published: Feb. 1, 2025

Language: Английский

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Surface Engineered Zno Nanorods Array for Multidirectional Force Detection

Published: Jan. 1, 2025

Tactile sensors are the cornerstone of modern technology development by mimicking human tactile perception and providing precise diverse mechanical feedback for cutting-edge fields such as robotics, medical equipment, virtual reality. However, current research predominantly concentrates on monitoring normal forces. How to accurately recognize decouple multidirectional force pairs remains a challenge. To this end, we design sensor modifying cuprous oxide (Cu2O) surface zinc nanorods (ZnO NRs) arrays integrating it with transverse force-to-vertical conversion structure. As result, modification boosts piezoelectric output ZnO sensitivity 17.25 nA MPa-1, which is about 3 times higher that pure ZnO. The mechanism underlying enhancement illustrated from perspective surface-engineered heterojunction. On basis, ability detect forces verified prototype, can monitor in 12 directions over 360° range. This work provides new strategy designing sensors, showing broad application prospect human-machine interaction beyond.

Language: Английский

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Impact of geometric design and mechanical strain on the electrocaloric effect of nanoscale BaTiO3/SrTiO3 composites

Acta Mechanica, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 8, 2025

Language: Английский

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Highly polarized piezoelectret embedded versatile haptic devices for immersive human-robot interactions

Nano Energy, Journal Year: 2025, Volume and Issue: unknown, P. 110775 - 110775

Published: Feb. 1, 2025

Language: Английский

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Optimized Magnetization Distribution in Body-Centered Cubic Lattice-Structured Magnetoelastomer for High-Performance 3D Force–Tactile Sensors

Sensors, Journal Year: 2025, Volume and Issue: 25(7), P. 2312 - 2312

Published: April 5, 2025

Flexible magnetic tactile sensors hold transformative potential in robotics and human-computer interactions by enabling precise force detection. However, existing face challenges balancing sensitivity, detection range, structural adaptability for sensing force. This study proposed a pre-compressed magnetization method to address these limitations amplifying the magnetoelastic effect through optimized direction distribution of elastomer. A body-centered cubic lattice-structured magnetoelastomer featuring regular deformation under compression was fabricated via digital light processing (DLP) validate this method. Finite element simulations experimental analyses revealed that magnetizing material 60% strain distribution, enhancing force-magnetic coupling. Integrating elastomer with hall sensor, prepared sensor demonstrated low limit (1 mN), wide range (0.001-10 N), rapid response/recovery times (40 ms/50 ms), durability (>1500 cycles). By using machine learning, enabled accurate 3D prediction.

Language: Английский

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Piezoelectric-induced piezo ionic effect enabling high-performance flexible sensors and batteries for intelligent target shooting training

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 162523 - 162523

Published: April 1, 2025

Language: Английский

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Multiscale Interconnected and Anisotropic Morphology Genetic Piezoceramic Skeleton Based Flexible Self‐Powered 3D Force Sensor

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 15, 2025

Abstract Inner‐wall fibers of natural loofah exhibit a macroscopic anisotropic network and microscopic 3D interconnected porous structure. Such unique multiscale structure is highly desired for enhancing the sensing capacities piezoelectric sensors under multi‐modal stress, big challenge existing devices but crucial next‐generation wearable electronics human‐machine interaction. Herein, morphology genetic piezoceramic skeleton composite sensor featuring presented, demonstrating excellent capability multidirectional stress. Simulation results indicate that improves stress transfer efficiency fully filled polymer prevents skeletons from collapsing high thereby endowing device with low detection limit (0.2 kPa), broad range ‐ 325.6 sensitivity (241.12 mV kPa −1 ) in compression mode. Meanwhile, displays anisotropy exceptional stretchability (≈45% strain), enabling simultaneous deformation magnitude direction bending The symmetrical integrated design ensures stable output over 300 000 cycles both modes. Furthermore, novel successfully employed comprehensive assessment cardiovascular health quantitative identification elastic modulus objects, enormous potential monitoring robotic intelligent perception.

Language: Английский

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Wireless Passive Flexible Radio Frequency Tactile Sensor for Material Recognition

Nano Letters, Journal Year: 2025, Volume and Issue: unknown

Published: April 30, 2025

Developing intelligent tactile systems for perceiving the real world is significant electronic skin and wearable devices. However, avoiding complex circuitry achieving lightweight wireless devices remain challenging. This study presents a biomimetic, ultrasensitive, multifunctional radio frequency sensor (WiRFTS), which comprises porous polyaniline-polydimethylsiloxane (PANI-PDMS) sponge, pressure electrodes, communication coil. Benefiting from synergistic effect of microstructure high dielectric PANI particles, WiRFTS exhibits an ultrahigh sensitivity 1.394 MHz/kPa (<10 kPa), linear 0.319 (10-200 resolution 0.28%. Especially, electromagnetic field at surface endows it with exceptional spatial perception. A noncontact material cognition system established by combining artificial intelligence algorithms, 100% recognition accuracy eight materials. Extensive RF-based properties ensures surpasses other technologies in identification diversity.

Language: Английский

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