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A comprehensive 3D-CFD analysis of operational and geometric effects on hydrogen absorption in MH reactor equipped with finned and tubular heat exchangers

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International Journal of Hydrogen energy 2025年 135卷 553-570页

作者： Bammoune, Abdelaziz Laouedj, Samir Dadda, Bachir Boukhari, Ali Bouali, Belkacem Laboratory of Materials and Reactive Systems Faculty of Technology Djillali Liabes University of Sidi Bel-Abbés Algeria Applied Research Unit for Renewable Energies URAER Renwable Energy Development Center CDER Ghardaïa47133 Algeria Mechanical Engineering Department Faculty of Technology El-Oued University Algeria Process Engineering Laboratory Laghouat University Laghouat Algeria

The chemisorption storage of hydrogen within metal hydride (MH) reactors is considered as the promising method for the successful emergence of hydrogen energy in mobility sector. However, there are two major areas that require attention for this process to be optimized: thermal management and gravimetric storage capacity of MH reactors system. In order to address these challenges, we propose a new cylindrical MH reactor tank design that is filled with 1.58 Kg of LaNi5 powder. To optimize heat and mass transfer during the exothermic hydrogen absorption reaction, we integrate two new heat exchangers containing heat transfer fluid (HTF), which have minor impacts on the reactor volume and weight. The first is a copper-finned heat exchanger, consisting of four rectangular pipes with six stages of circular fins, with occupied ratio of 17.3 % and 14.7 % in total mass and volume of reactor system, respectively. The second is a tubular heat exchanger jacket with a spiral tube on stainless steel SS316, welded to the peripheral wall of the reactor with ratio of 16.3 % and 15.7 % in total mass and volume of reactor. We conducted a three-dimensional numerical study using CFD code of ANSYS FLUENT software to analyse heat and mass transfers during the hydrogen absorption process. The aim of this study is to assess how operational parameters and the geometric design of the two integrated heat exchangers affect the efficiency of solid hydrogen storage, with a focus on identifying optimization possibilities. The results of our simulation procedure were validated with numerical and experimental data published in the literature, showing good agreement. The obtained results indicate that the absorption reaction kinetics exhibit a greater responsiveness to hydrogen injection pressure in comparison to the effect of temperature and the velocity of HTF. Inserting fins through the cooling fluid medium has a dual impact on the heat absorbed by the HTF, increasing its amount and accelerating i

关键词： Fins (heat exchange)

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Unveiling Feedstock Variability: Insights into Corn Stover Conversion - Part I: Physicochemical Properties and Self-Degradation

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ACS Sustainable Chemistry and Engineering 2025年第20期13卷 7406-7417页

作者： Kang, Xihui Dou, Chang Sale, Kenneth L. Ding, Ling Zeng, Yining Goliman, Kennedy A. Donohoe, Bryon S. Sun, Ning Advanced Biofuels and Bioproducts Process Development Unit Biological Systems and Engineering Division Lawrence Berkeley National Laboratory Emeryville 94608 CA United States Deconstruction Division Joint BioEnergy Institute 5885 Hollis Street Emeryville 94608 CA United States Department of Biosecurity and Bioassurance Sandia National Laboratories 7011 East Avenue Livermore 94551 CA United States Energy and Environment Science & Technology Idaho National Laboratory 1955 N Fremont Ave Idaho Falls 83415 ID United States Renewable Resources and Enabling Sciences Center National Renewable Energy Laboratory Golden 80401 CO United States College of Computing Data Science and Society University of California Berkeley 94720 CA United States Biosciences Center National Renewable Energy Laboratory Golden 80401 CO United States

Transforming agricultural waste into biofuels and bioproducts is crucial to advancing a low-carbon bioeconomy. However, the inherent variability in the composition and quality introduces uncertainties in the conversion efficiency and poses challenges in process development. Through integrating a high-throughput conversion system, material characterization techniques, and advanced data analysis tools, this study investigates the variability of corn stover and its subsequent impacts on carbohydrate conversion. The findings reveal that indoor storage substantially reduces the moisture and ash content and soil contamination, while other properties remain largely unchanged. Self-degradation due to microbial activity during storage decreases the carbohydrate content of corn stover but enhances glucose and xylose yields. A negative correlation is observed between sugar yields and lignin content across samples with varying ash and moisture content. The inhibitory effect of lignin diminishes in self-degraded samples likely due to the disrupted cell wall structure. Although self-degradation slightly increases cellulose crystallinity, no strong correlation was observed between the crystallinity and sugar yield. Hot water pretreatment under mild conditions effectively mitigates inherent variability, consistently improving the sugar yield from corn stover by up to 50%. By elucidating the feedstock variability and its impact on convertibility, these findings offer valuable insights into appropriate feedstock handling and management, highlighting potential strategies to address variability challenges. © 2025 American Chemical Society.

关键词： corn stover enzymatic hydrolysis feedstock characterization pretreatment self-heating

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Electret patterning technologies for microsystems

Electret patterning technologies for microsystems

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systems Integration 2010 - 4th European Conference and Exhibition on Integration Issues of Miniaturized systems - MEMS, MOEMS, ICs and Electronic Components

作者： Leonov, Vladimir Van Hoof, Chris Altena, Geert Goedbloed, Martijn Van Schaijk, Rob IMEC Smart Systems and Energy Technology Unit Leuven Belgium Holst Centre IMEC Smart Systems and Energy Technology Unit Eindhoven Netherlands

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energy impact in the design space exploration of loop buffer schemes in embedded systems

Energy impact in the design space exploration of loop buffer...

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2013 IFIP/IEEE 21st International Conference on Very Large Scale Integration, VLSI-SoC 2013

作者： Artes, Antonio Ayala, Jose L. Fasthuber, Robert Raghavan, Praveen Catthoor, Francky Computer Architecture and Automation Department Complutense University of Madrid Madrid Spain Smart Systems and Energy Technology Unit IMEC Leuven Belgium

ISBN: (纸本)9781479905249

The reduction of the energy consumption in the domain of the embedded systems is becoming the most important design goal due to the increasing use of battery powered consumer devices. Previous research has pointed out the instruction memory organisation as one of the major sources of energy consumption of the embedded systems. Due to this fact, the introduction of any enhancement in this component of the system becomes crucial in order to decrease this energy bottleneck. The purpose of this paper is to present a highlevel energy analysis of the loop buffer schemes that exist in the embedded systems. The crucial energy analysis that is presented in this paper not only proposes a method to evaluate different loop buffer schemes for a certain application, but also guides embedded systems designers to make the correct decision in the trade-offs that exist between the energy budget, the required performance, and the area cost of the embedded system. Experimental results used in this analysis show that, the search of energy savings (up to 76%) has to take into account the performance penalty, the area cost, and the impact of the implementation technology in order to choose the most suitable enhancement that has to be introduced in the instruction memory organisation from the point of view of the energy consumption. © 2013 IEEE.

关键词： Embedded systems

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Materials considerations for MEG (mono ethylene glycol) reclamation systems

Materials considerations for MEG (mono ethylene glycol) recl...

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Corrosion 2007

作者： Joosten, Michael W. Tier, Benjamin Seiersten, Marion Wintermark, Christian ConocoPhillips Company Bartlesville Technology Center Oklahoma United States North Sea Business Unit Aberdeen United Kingdom Institute for Energy Technology Kjeller Norway Aker Kvaemer Process Systems AS Lysaker Norway

This paper compares the suitability of 22 Cr duplex stainless steel (UNS S31803), low alloy steel, and Alloy 625 (UNS N06625) for MEG reclamation systems. Oxygen is of particular interest. Corrosion of duplex stainless steel in the presence of high oxygen concentrations under MEG reclamation conditions is manifested as preferential ferrite dissolution and/or localized corrosion at crevices. Oxygen entry must be minimized to prevent corrosion of duplex stainless steel. Corrosion most likely occurs where salts deposit. Low alloy steels pit at low oxygen concentrations. Duplex stainless steel (with oxygen restrictions) and Alloy 625 are suitable for the MEG reclamation service conditions. © 2007 by NACE International.

关键词： Steel corrosion

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Multilayer electrets for vibration energy harvesting at extremely high temperatures

Multilayer electrets for vibration energy harvesting at extr...

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smart systems Integration Conference 2011, SSI 2011

作者： Leonov, Vladimir Van Hoof, Chris Goedbloed, Martijn Van Schaijk, Rob IMEC Smart Systems and Energy Technology Unit Heterogeneous Integrated Microsystems Dept. Leuven Belgium IMEC Holst Centre Wireless Autonomous Transducer Solutions Dept. Eindhoven Netherlands

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Wearable energy harvester of human body heat with a bulk-micromachined poly-Si thermopile

Wearable energy harvester of human body heat with a bulk-mic...

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smart systems Integration Conference 2011, SSI 2011

作者： Leonov, Vladimir Van Hoof, Chris Van Andel, Yvonne Wang, Ziyang Jambunathan, Madhusudhanan Elfrink, René Vullers, Ruud J.M. IMEC Smart Systems and Energy Technology Unit Heterogeneous Integrated Microsystems Dept. Leuven Belgium IMEC Holst Centre Wireless Autonomous Transducer Solutions Dept. Eindhoven Netherlands

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Fine Patterning of Electrets for Sensors and energy Harvesters

Fine Patterning of Electrets for Sensors and Energy Harveste...

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IEEE Sensors Conference

作者： Vladimir Leonov Martijn Goedbloed Christine de Nooijer Rob van Schaijk Heterogeneous Integrated Microsystems Department Smart Systems and Energy Technology Unit Imec Leuven Belgium Ultra Low Power Components Department Smart Systems and Energy Technology Unit Holst Centre / Imec Eindhoven The Netherlands

ISBN: (纸本)9781457717666

Charge patterning on 1.3 μm-wide electret lines has successfully been demonstrated with a voltage of 80 V between charged Si_3N_4 lines and discharged unpatterned underlying SiO_2. The fabrication technology and charge patterning methods were developed. A nine-month aging test on open air confirms that there is seemingly no dependence of charge retention time on line width within the 1 mm to 1.3 μm range. Accounting for the decay of surface potential during 9 months of aging, the charge lifetime in 1.3 μm-wide electret lines is about 40 years.

关键词： Electrets Annealing Electric potential Discharges (electric) Fabrication Temperature dependence Temperature measurement

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Investigating the uptake of brilliant blue FCF and orange II dyes from aqueous solution onto a porous Al-based MOF sorbent (CAU-10-H)

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Inorganic Chemistry Communications 2025年 178卷

作者： Bopda, Aurelien Fotsop, Cyrille Ghislain Kenda, Georges Teikam Tchuifon, Donald Raoul Tchuifon Mache, Floriane Fotsing Nguena, Kora Lucresse Tiomo Doungmo, Giscard Ndifor-Angwafor, Nche George Ghosh, Kalyan Sundar Hosseini-Bandegharaei, Ahmad Advanced School of Mines Processing and Energy Resources University of Bertoua P.O. Box 416 Bertoua Cameroon Institute of Chemistry Faculty of Process and Systems Engineering Universität Platz 2 Magdeburg 39106 Germany Department of Chemistry Research Unit of Noxious Chemistry and Environmental Engineering Faculty of Science University of Dschang P.O. Box 67 Dschang Cameroon Laboratory of Chemical Engineering and Industrial Bio-Processes (LCEIBP) National Higher Polytechnic School of Douala University of Douala P.O. Box 2701 Douala Cameroon Africa Center of Excellence in Future and Electrochemical Systems Federal University of Technology Owerri Nigeria Institut für Anorganische Chemie Christian-Albrechts-Universität zu Kiel Max-Eyth-Str. 2 Kiel 24118 Germany Department of Chemistry National Institute of Technology Hamirpur Hamirpur India Faculty of Chemistry Semnan University Semnan Iran Department of Sustainable Engineering Saveetha School of Engineering SIMATS Tamil Nadu Chennai 602105 India Centre of Research Impact and Outcome Chitkara University Punjab Rajpura 140417 India

Water pollution by dyes has become a serious problem worldwide. In this work, a porous CAU-10-H MOF sorbent was synthesized from Al2(SO4)3·18H2O and BDC and used for the adsorptive removal of BBF and orange II fr... 详细信息

Water pollution by dyes has become a serious problem worldwide. In this work, a porous CAU-10-H MOF sorbent was synthesized from Al₂(SO₄)₃·18H₂O and BDC and used for the adsorptive removal of BBF and orange II from solutions. FT-IR and EDX spectroscopy;SEM, XRD, TGA, N₂ adsorption–desorption studies, pH and pH_PZC were used to study the physico-chemical features of the MOF. The adsorption was carried out in batch mode following an experimental design matrix of RSM (response surface methodology) generated using Statgraphics Plus 18 software. The factors taken into account are the pH and initial concentration of the dye solutions, the contact time and the mass of CAU-10-H adsorbent. The study of the kinetics and non-linear adsorption isotherms was done with Excel solver. Two-, three-, and four-parameter isotherm models were considered. Results from characterization techniques confirmed the reaction between Al³⁺ and the BDC ligand to yield the MOF. From optimization studies, the values of each factor for which the adsorption turned out to be optimal are: dye concentration of 50 mg/L and adsorbent mass of 25 mg for both dyes;pH = 9.33 and 2.00 respectively for BBF and orange II;time of 90 and 10 min respectively for BBF and orange II. Under these conditions, adsorbed quantities of 19.002 mg/g and 7.614 mg/g for BBF and orange II respectively were obtained and CAU-10-H lost only about 9.4 % of its efficiency after five cycles of BBF adsorption. Kinetic studies revealed that the adsorption of BBF is a multilayer adsorption and that of orange II is a monolayer adsorption. Isotherms modelling showed that the adsorption of both dyes occurs on a heterogeneous surface. It emerges from this work that CAU-10-H can be used as an efficient adsorbent for the depollution of industrial wastewaters containing with BBF or orange II. © 2025 Elsevier B.V.

关键词： 3-dicarboxylic acid Adsorption Benzene-1 Brilliant blue FCF MOF Orange II

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Circuit Design for Bias Compatibility Investigation of Bulk FinFET Based Floating Body RAM

Circuit Design for Bias Compatibility Investigation of Bulk ...

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IEEE International Workshop on Memory technology, Design and Testing

作者： A. Anchlia M. Garcia Bardon P. Poliakov B. Rooseleer B. De Wachter N. Collaert K. van der Zanden M. Miranda Corbalan W. Dehaene D. Verkest Smart Systems & Energy Technology Unit and Process Technology Unit IMEC Leuven Kapeldreef Belgium Electrical Engineering Department - ESAT Katholieke Universiteit Leuven Leuven Belgium Interuniversitair Micro-Elektronica Centrum Leuven Vlaams-Brabant BE

Single transistor Floating Body Random Access Memories (FB-RAMs) are foreseen to bring size and speed benefits and have the potential to replace existing DRAMs. However, the implementation in matrix is complex because the voltages applied to access one cell can disturb the state of other cells. We propose an approach at circuit level to provide compatible bias conditions and to explore further on the optimization of the biasing voltages for improved write and read operations and improved retention. To do so we use synchronized bitline and wordline drivers providing different voltages to selected and unselected lines during the different operations. In addition, a robust sensing scheme is described that can be implemented in the same process technology as the array. The full circuit has been validated by simulations based on the experimental data of fabricated bulk FinFETs floating body cells and the design has been taped out.

关键词： Circuit synthesis FinFETs Random access memory Voltage Capacitors Circuit testing Read-write memory Robustness Scalability CMOS process

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