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AIAA Science and technology Forum and Exposition, AIAA SciTech Forum 2025

作者： Al Hadi, Z. Basnet, S. Marragou, S. Sharma, P. Schuller, T. Guiberti, T.F. Magnotti, G. Thuwal23955-6900 Saudi Arabia Mechanical Engineering Program Physical Science and Engineering Division King Abdullah University of Science and Technology Thuwal23955-6900 Saudi Arabia Institut de Mécanique des Fluides de T95T Université de Toulouse CNRS Toulouse France France

ISBN: (纸本)9781624107238

The global push toward decarbonization has positioned hydrogen as a key contender for clean energy applications. This study explores low-NOx hydrogen/air combustion in a lifted flame configuration using simultaneous 1D Raman and OH-LIF spectroscopy. High resolution measurements of temperature and species concentrations (H2, O2, and OH) provide crucial information on the structure of the flame and the stabilization mechanisms within a dual-swirl burner. The results reveal distinct inner and outer reaction fronts, each exhibiting unique combustion behaviors due to differences in gas composition, temperature, turbulence levels, and strain rates. The study focuses on the dynamics of the edge flame at the base of the outer reaction front, where air and hydrogen progressively mix along the flow axis. Detailed analysis of flow structure, flame dynamics, and properties at key locations highlights the interplay between flow and combustion processes. These findings provide a unique experimental data set for understanding the fundamental characteristics of swirled H2 flames, validating numerical models, and guiding the development of optimized low-NOx H2 combustion systems. © 2025, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Flow structure

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Response of unsteady thermocapillary convection to local heating at specific depths in a thin liquid film

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Chemical engineering Science 2025年 314卷

作者： Kudo, Masaki Igarashi, Keita Mechanical Systems Engineering Program Monozukuri Engineering Department Tokyo Metropolitan College of Industrial Technology 10-40 Higashi-oi 1-chome Tokyo Shinagawa City140-0011 Japan

A hydrothermal wave (HTW) refers to a flow pattern that arises during unsteady thermocapillary convection, negatively impacting the purity of single crystals during zone melting. This study utilized active control through localized heating to reduce HTW amplitude, akin to noise cancellation. The effectiveness of this method was evaluated both experimentally and numerically by adjusting the heating depth in a thin liquid film. Silicone oil served as the test fluid, and the liquid film was rectangular in shape. In the case of linear time-periodic heating, a line-shaped heater applied a constant maximum heat input, synchronized with the HTW's period. Experimental results indicated that HTW amplitude significantly depends on the heating depth of the liquid film. Downstream of the HTW, temperature amplitude could be reduced by up to 60%, whereas upstream, it could be amplified. In numerical simulations, HTW reduction and amplification were linked to substantial changes in the streamwise temperature gradient on the free surface, rather than to local cancellation of the temperature disturbance. Unlike the results from single-pulse heating control, the amplitude ratio showed a strong dependence on whether the heat input significantly affected the streamwise thermal and flow fields. © 2025 Elsevier Ltd

关键词： Liquid films

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Improving mechanical Durability of SLA-Printed Components for Load-Bearing 154th

Improving Mechanical Durability of SLA-Printed Components fo...

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154th Annual Meeting and Exhibition of The Minerals, Metals and Materials Society, TMS 2025

作者： Fani, Niloofar Monfared, Armaghan Hashemi Sadeghzade, Sorour Tavangarian, Fariborz Mechanical Engineering Program School of Science Engineering and Technology Pennsylvania State University Harrisburg MiddletownPA17057 United States Department of Biomedical Engineering Pennsylvania State University State College University ParkPA16802 United States School of Engineering Westlake University Hangzhou310024 China

ISBN: (纸本)9783031807473

This study explored the impact of post-printing parameters in stereolithography (SLA) technology, particularly focusing on how photopolymerization affected the mechanical properties of samples. Building on previous research, the investigation revealed that different curing temperatures significantly influenced the rigidity and stiffness of the printed samples. The mechanical properties of the samples were evaluated through three-point bending tests. Curing at 60 °C left some polymer chains uncured, resulting in less rigid samples but increased load capacity (up to 30 ± 2.4 N) and deflection (2.9 ± 0.6 mm). On the other hand, curing at 70 °C enhanced the rigidity and stiffness, especially for larger samples. The results demonstrated that photopolymerization and the resulting polymer chain cross-linking are crucial for achieving the desired mechanical properties. Notably, as the diameter of the samples decreased, the difference in stiffness between the 60 and 70 °C cured samples also reduced. The findings highlight the importance of optimizing curing temperatures to tailor the mechanical performance of SLA-printed components for specific applications. © The Minerals, Metals & Materials Society 2025.

关键词： Bending tests

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Operational Efficiency of Synchronous Reluctance Generator Systems using Vector Control

Operational Efficiency of Synchronous Reluctance Generator S...

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International Electrical engineering Congress (iEECON)

作者： Ryunosuke Hayashi Wataru Kitagawa Takaharu Takeshita Azusa Takahashi Tatsuya Higashi Creative Engineering Education Program Nagoya Institute of Technology Nagoya Japan Department of Electrical and Mechanical Engineering Nagoya Institute of Technology Nagoya Japan Departmnt of Electrical and Mechanical Engineering Nagoya Institute of Technology Nagoya Japan Mobility Development Group DAIHATSU MOTOR CO. LTD. Osaka Japan

ISBN: (数字)9798331543952

ISBN: (纸本)9798331543969

This study aims to verify the operation of a system that combines a generator, an inverter to control it, and a power conditioner, as well as to observe the system efficiency at the theoretical MTPA (Maximum Torque Per Ampere) point. The generator is driven by vector control with a rated output of 12 kW, and the inverter has a capacity of 47 kW.

关键词： Electrical engineering Torque Inverters Generators Reluctance generators

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Corrigendum to "Effect of cell imprinting on viability and drug susceptibility of breast cancer cells to doxorubicin" [Acta Biomaterialia, 2020, 113, 119-129] (Acta Biomaterialia (2020) 113 (119–129), (S1742706120303287), (10.1016/***.2020.06.007))

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Acta Biomaterialia 2025年 198卷 571-572页

作者： Shahriyari, Fatemeh Janmaleki, Mohsen Sharifi, Shahriar Hesar, Milad Eyvazi Hoshian, Sasha Taghiabadi, Reza Razaghian, Ahmad Ghadiri, Majid Peirovi, Afshin Mahmoudi, Morteza Nezhad, Amir Sanati Khademhosseini, Ali Division of Engineering in Medicine Department of Medicine Brigham and Women's Hospital Harvard Medical School CambridgeMA United States Division of Health Sciences & Technology Harvard-Massachusetts Institute of Technology Massachusetts Institute of Technology CambridgeMA United States Department of Materials Engineering Faculty of Engineering Imam Khomeini International University Qazvin Iran Biomedical Engineering Graduate Program University of Calgary Canada Precision Health Program and Department of Radiology Michigan State University East LansingMI48824 United States RWTH Aachen University Templergraben 55 Aachen52062 Germany Department of Chemistry and Materials Science Aalto University School of Chemical Engineering Espoo Finland Department of Mechanical Engineering Faculty of Engineering Imam Khomeini International University Qazvin Iran Nano-Biotechnology Department Pasteur Institute of Iran Tehran Iran Departments of Bioengineering Chemical and Biomolecular Engineering and Radiological Sciences Center for Minimally Invasive Therapeutics California NanoSystems Institute University of California – Los Angeles Los AngelesCA United States Terasaki Institute for Biomedical Innovation Los AngelesCA United States

The authors regret to report that the images for panels h (Plain PDMS) and I (MCF7-imprinted PDMS) in Fig. 3 were mistakenly taken from the same dataset, resulting in the omission of the correct image in panel h for the Plain PDMS day 7 image. We sincerely apologize for this error. For an accurate representation, please see the corrected Fig. 3 provided here along with its original figure caption. This does not affect the validity of the statistical analyses or the overall conclusions drawn from the study. © 2025

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Optimization of biomass-fueled vertical corn drying: Efficiency, energy balance, and sustainability

Results in Engineering

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Results in engineering 2025年 26卷

作者： Sukmawaty, Sukmawaty Syahrul, Syahrul Amuddin, Amuddin Rahmi, Sri Helmayana Syahrul, Ahmad Ibrahim Agricultural Engineering Study Program Faculty of Food Technology and Agroindustry University of Mataram Mataram 83125 Indonesia Mechanical Engineering Department Engineering Faculty University of Mataram Mataram 83125 Indonesia

This study investigates the thermal performance and energy efficiency of a biomass-fueled vertical dryer utilizing candlenut shell biomass for corn drying. The objective is to evaluate drying behavior under continuous and discontinuous operation modes at different temperature settings. A custom-built dryer was developed and tested at 45 °C, 50 °C, and 55 °C, and energy input, drying time, and efficiency were recorded. Statistical analyses, including paired t-tests, were conducted to examine the significance of operational differences. Results show that continuous drying at 50 °C and 55 °C significantly improves drying efficiency, reaching above 66 %, and reduces drying time compared to discontinuous modes. Candlenut shells performed well as a renewable fuel, offering stable combustion and minimal ash production, outperforming traditional fuels such as rice husks and corn cobs in similar drying conditions. Energy analyses indicated balanced energy use, while future work should address post-drying quality characteristics and automation. These findings suggest that candlenut shells are a viable, sustainable alternative for efficient post-harvest thermal processing, particularly in rural agro-industrial settings. © 2025 The Authors

关键词： Agricultural sustainability Biomass-fueled drying Corn drying efficiency Energy optimization Renewable energy

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Toward Carnot efficient high output power heat engines using bubbly two-phase flow

arXiv

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arXiv 2025年

作者： Miron, Dror Neumann, Yuval Cassell, Joseph Feintuch, Nir Shinkarenko, Alexey Rotschild, Carmel The Nancy and Stephen Grand Technion Energy Program Technion – Israel Institute of Technology Haifa3200003 Israel Faculty of Mechanical Engineering Technion – Israel Institute of Technology Haifa3200003 Israel Lava Energy LTD

Thermodynamic gas power cycles achieving Carnot efficiency require isothermal expansion, which is associated with slow processes and results in negligible power output. This study proposes a practical method for rapid near-isothermal gas expansion, facilitating efficient heat engines without sacrificing power. The method involves bubble expansion in a heat transfer liquid, ensuring efficient and near-isothermal heat exchange. The mixture is accelerated through a converging-diverging nozzle, converting thermal energy into kinetic energy, thereby rotating a reaction turbine for electricity generation. Nozzle experiments with air and water yielded a polytropic index © 2025, CC BY.

关键词： Nozzles

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Sintering-based lithography metal additive manufacturing of chiral mechanical metamaterials with a twist

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Procedia CIRP 2025年 132卷 104-109页

作者： Ruslan Melentiev Ahmed Wagih Bram van der Heijden Gilles Lubineau Carlos A. Grande Advanced Membranes & Porous Materials Center. King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia KAUST Catalysis Center. King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia Mechanical Engineering Program Physical Sciences and Engineering Division King Abdullah University of Science and Technology (KAUST) Saudi Arabia Mechanics of Composites for Energy and Mobility Lab King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia Chemical Engineering Program. Physical Science and Engineering Division King Abdullah University of Science and Technology

Metamaterials are a class of materials with extraordinary capabilities derived from their engineered structure. In 2017, Frenzel et al. (Science 358, 2017) conceptualized “three-dimensional mechanical metamaterials with a twist,” which convert linear deformation into rotational motion—a mechanical response that surpasses the bounds of Cauchy continuum mechanics. However, the lack of suitable manufacturing technologies for producing metallic twist metamaterials has precluded their experimental validation and potential applications to date. Herein, 316L-stainless-steel twist metamaterials are fabricated at various scales using an emerging sintering-based technology—lithography metal manufacturing (LMM) —and their mechanical responses are tested using stereo digital image correlation. Results provide the first empirical evidence of compression-induced rotation in steel twist metamaterials and highlight their sensitivity to manufacturing defects. Download: Download video (753KB) Download: Download video (2MB) Download: Download video (4MB)

关键词： Additive manufacturing sintering stainless steel metamaterials mechanical properties

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Lithography-based additive manufacturing of steel metamaterials: effect of sintering temperature on shape distortion, microstructure and mechanical properties

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Procedia CIRP 2025年 132卷 80-85页

作者： Ruslan Melentiev Ahmed Wagih Gilles Lubineau Carlos A. Grande Advanced Membranes & Porous Materials (AMPM) Center. King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia KAUST Catalysis Center (KCC). King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia Mechanical Engineering Program Physical Sciences and Engineering Division King Abdullah University of Science and Technology (KAUST) Saudi Arabia Mechanics of Composites for Energy and Mobility Lab King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia Chemical Engineering Program. Physical Science and Engineering (PSE) Division King Abdullah University of Science and Technology

Lithography metal manufacturing (LMM) is an emerging sinter-based additive manufacturing (AM) technology for support-free 3D printing of extremely complex parts with micrometric resolution on a decimeter scale. Although the printing phase of LMM is well-established, the sintering stage is challenging due to either high porosity or melting-induced deformation, particularly in thin-walled lattices and metamaterials. This study investigates the effects of sintering temperature on shape distortion, surface morphology, chemistry, porosity, microstructure, and mechanical properties of 316L stainless steel auxetic metamaterials 3D printed using LMM and sintered in a furnace customized for precise temperature control. Our results show that the fully dense grain microstructure with high plasticity can be sintering within 1300 – 1325 °C range. Going beyond this temperature results in shape distortion and embrittlement of the steel metamaterials. The previously recommended range of sintering temperatures for 316L steel, 1360 - 1380 °C need revision.

关键词： Additive manufacturing (AM) Debinding Sintering Metal Metamaterials mechanical properties

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A comprehensive evaluation of the use of graphene enriched cutting fluids on the surface integrity of very poor-grindability materials

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Wear 2025年

作者： de Oliveira, Déborah de Paiva, Raphael Lima de Souza Ruzzi, Rodrigo Jackson, Mark James Gelamo, Rogério Valentim Machado, Alisson Rocha da Silva, Rosemar Batista University of Brasília Department of Mechanical Engineering DF Brasília Brazil Federal University of Piauí School of Mechanical Engineering PI Teresina Brazil Federal University of Uberlandia School of Mechanical Engineering MG Uberlandia Brazil Kansas State University College of Technology and Aviation SalinaKS United States Federal University of Triângulo Mineiro Institute of Technological and Exact Sciences MG Uberaba Brazil Pontifícia Universidade Católica do Paraná Mechanical Engineering Graduate Program PR Curitiba Brazil

The use of graphene has stood out in recent years in different fields due to the wide applicability based on its properties. Specifically, multilayer graphene can be highlighted as a good lubricant, it possesses low shear resistance between layers and has good thermal conductivity. Those characteristics are well suitable for cutting fluids, especially considering the grinding process which presents high friction, elastic and plastic deformations, and the intense occurrence of plowing, thereby resulting in high specific cutting energy. However, studies have shown the use of graphene on cutting fluids can be influenced by many factors, including delivery methods, particle concentrations and even the workpiece material. Thus, a comprehension of how graphene particles added to the cutting fluid interact at the abrasive-chip interface is important for its correct use and the achievement of high-quality surfaces. In this sense, this work aims to investigate the use of multilayer graphene enhanced cutting fluids delivered during the grinding process for three different very poor-grindability materials: Inconel 625, Inconel 718 and SAE 52100 hardened steel. Different multilayer graphene concentrations (0.05–0.1 wt%) were added in the same base fluid and tested under different flow rates. The influence of graphene was assessed in terms of grinding power, surface roughness and morphology (SEM images). The experimental results showed that for the lower hardness material (Inconel 625), graphene promoted intense plowing and adhered material on the ground surface, while for the SAE 52100 steel, minor effects were generated on the surface affecting its integrity. For Inconel 718, that possesses both high hardness and ductile responses, the presence of graphene in the cutting fluid provides a great improvement in cutting, resulting in 15 % and 27 % reduction in surface roughness values and grinding power, respectively, even for a low cutting fluid flow rate. © 2025 Elsevier B.V.

关键词： Grinding (machining)

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