Carbon-Free H2 Production from Ammonia Decomposition over 3D-Printed Ni-Alloy Structures Activated with a Ru/Al2O3 Catalyst DOI Open Access
Cristina Italiano,

Gennaro G. Marino,

Minju Thomas

et al.

Processes, Journal Year: 2024, Volume and Issue: 12(12), P. 2663 - 2663

Published: Nov. 26, 2024

Hydrogen, with its high energy density and zero greenhouse gas emissions, is an exceptional vector, pivotal for a sustainable future. Ammonia, serving as practical cost-effective hydrogen carrier, offers secure method storage transport. The decomposition of ammonia into crucial process producing green hydrogen, enabling use in applications ranging from clean generation to fueling hydrogen-powered vehicles, thereby advancing the transition carbon-free economy. This study investigates catalytic performance various 3D-printed porous supports based on periodic open cellular structures (POCS) triply minimal surface (TPMS) architecture manufactured IN625 nickel alloy powder using laser bed fusion (LPBF) technique. POCS TPMS, featuring geometries including BCC, Kelvin, Gyroid, were analyzed cell size, strut/sheet diameter, porosity, specific area. Pressure drop analyses demonstrated correlations between structural parameters fluid dynamics, BCC exhibiting lower pressure drops due their higher porosity channel network. dip/spin coating was successfully applied activate commercial Ru/Al2O3 catalyst, achieving uniform coverage performance. Among tested geometries, Gyroid structure showed superior activity towards decomposition, attributed efficient mass transfer pathways. highlights importance design optimizing processes suggests promising candidate improving reactor efficiency compactness production systems.

Language: Английский

Topology optimization of the IWP triply periodic minimal surfaces (TPMS) heat sink based on porous media effective model DOI

Zhichao Men,

Wenjiong Chen,

Quhao Li

et al.

International Journal of Heat and Mass Transfer, Journal Year: 2025, Volume and Issue: 240, P. 126657 - 126657

Published: Jan. 4, 2025

Language: Английский

Citations

1
Evaluation of Sinusoidal Wave Energy Dissipation over a Gyroid Triply Periodic Minimal Surface-based Porous Breakwater DOI Open Access

Khanh Le Thanh Duy,

Khuong D. Nguyen

Journal of Physics Conference Series, Journal Year: 2025, Volume and Issue: 2949(1), P. 012002 - 012002

Published: Feb. 1, 2025

Abstract Breakwaters with porosity have been considered one of the most prospective keys to wave’s energy reduction issues in shoreline engineering area. In this project, specimen test would be a permeable porous breakwater design relied on structural Triply Periodic Minimal Surface (TPMS) unit cells-Gyroid. The paper’s primary purpose is utilize numerical method Finite Volume Method (FVM) evaluate approximately dissipation before and after crashing against structures. To detailed, experiment has two stages: validation verification. For first stage, validate accuracy mathematical sinusoidal wave model, computational fluid dynamics software (CFD) Ansys Fluent was utilized approximate characteristics compared empirical experiment, which generated by plunger-type wavemaker controlled three different rounds per minute(RPM), separately 22(r/min), 44(r/min) 66(r/min) flume without breakwater. characteristics, such as period T , height H wavelength L process. Next, those set-ups are reapplied for tank containing Gyroid effective performance regarding prevention proficiency, based transmission coefficient ( C t ). conclusion, proposed model validated, there strong agreement between experimental results. Finally, exhibited outstanding efficacy reduction.

Language: Английский

Citations

0
Enhanced Regenerative Cooling Performance with Conformal TPMS Channels DOI
Chao Gao,

Wenjun Xu,

Xinning Zhu

et al.

Energy, Journal Year: 2025, Volume and Issue: unknown, P. 135530 - 135530

Published: March 1, 2025

Language: Английский

Citations

0
Multi-objective optimization of double-layer microchannel heat sink with trapezoidal cross-sections based on computational fluid dynamics DOI
Rafat Mohammadi,

Vahid Dadras

International Journal of Thermal Sciences, Journal Year: 2025, Volume and Issue: 214, P. 109879 - 109879

Published: March 18, 2025

Language: Английский

Citations

0
Fluid Flow and Heat Transfer Performances of Aluminum Alloy Lattices with Triply Periodic Minimal Surfaces DOI Open Access

Zhensen Liu,

Ziyang Gao, Mingqiu Dai

et al.

Materials, Journal Year: 2025, Volume and Issue: 18(7), P. 1407 - 1407

Published: March 22, 2025

Thermal protection systems play a pivotal role in astronautical engineering fields. However, traditional rectangular fin (RF) structures exhibit low thermo-fluid properties. Inspired by the minimal surfaces nature, this study develops three types of triply periodic surface (TPMS) lattices, namely, sheet primitive (SP), network I-WP (NW), and (SW) using mathematical formulae. The TPMS lattices are fabricated laser powder bed fusion AlSi10Mg powder. A convective heat transfer simulation model is established validated through experiments. fluid flow characteristics, overall performance comprehensively investigated based on model. Results show that relationship between pressure loss velocity satisfies Darcy–Forchheimer law. Compared to RF structures, more uniform temperature distribution at same rate, highest coefficient increased approximately 96.62%. This due complex internal which enhance disturbance further improve coefficient. thermal index (α) higher than with an order αSP>αSW>αNW>αRF, confirms potential applications systems.

Language: Английский

Citations

0
Numerical Comparison of TPMS Structures for the Design of an Automotive Engine Oil Cooler DOI
Federico Torri, Fabio Berni, Lorenzo Martoccia

et al.

SAE technical papers on CD-ROM/SAE technical paper series, Journal Year: 2025, Volume and Issue: 1

Published: April 1, 2025

<div class="section abstract"><div class="htmlview paragraph">Triply Periodic Minimal Surface (TPMS) structures offer the possibility of reinventing structural parts and heat exchangers to obtain higher efficiency lighter or even multi-functional components. The crescent global climate concern has led increasingly stringent emissions regulations adoption TPMS represents a resourceful tool for OEMs downsize lighten mechanical parts, thereby reducing overall vehicle weight fuel consumption. In particular, are gaining growing interest in exchanger field as their morphology allows them naturally house two separate fluids, thus ensuring transfer without mixing. Moreover, TPMS-based can countless possible design configurations. These obtained by periodic repetitions three spatial dimensions specific unit cell with defined wall thickness. By tuning characteristic parameters, structure be tailored desired weight, surface-to-volume ratio strength. light this, paper provides numerical comparison between different types four identify most suitable parameter combination water-engine oil exploiting structure. Based on previous work, Gyroid Diamond considered promising structures, while 5, 6, 8 12 mm. For fair comparison, specimens share same volume thickness, which is chosen minimize thermal conductive resistance concurrently minimum value required technological requirements. tested at mass flow rate combinations engine water, representative an automotive cooler. Finally, compared terms computed pressure drops transfer. addition, plate-fin turbulators added discuss potentials this innovative respect conventional solutions.</div></div>

Language: Английский

Citations

0
Numerical Investigation of Sheet-Gyroid Structure Modifications for Mixing Application in Renewable Energy Technologies DOI Creative Commons
Martin Beer, Radim Rybár

Energies, Journal Year: 2025, Volume and Issue: 18(9), P. 2265 - 2265

Published: April 29, 2025

The presented study focuses on evaluating the mixing properties of structures derived from so-called sheet-gyroid geometry and their modifications as advanced elements in renewable energy technologies. Using numerical simulations based computational fluid dynamics (CFD), hydrodynamic characteristics basic structure five geometric were analyzed under laminar flow conditions simulating water ethylene glycol. evaluation was conducted using parameters index performance index, which express efficiency homogenization its associated demands. results show that all tested geometries significantly improve degree compared to an empty channel. highest concentration homogeneity best achieved by twisted structure. This modification exhibits value confirming ability achieve excellent with minimal pressure losses. demonstrated that, despite similar hydraulic losses among some structures, differs, highlights importance targeted design structures. These findings are essential for efficient mixers technological applications where intensive combined consumption is a critical factor.

Language: Английский

Citations

0
Pore-Scale multi-objective shape optimization of triply periodic minimal surface cellular architectures: Volumetric Nusselt number versus friction factor DOI Creative Commons

Alessandro V. Anacreonte,

Marcello Iasiello, Gerardo Maria Mauro

et al.

International Journal of Heat and Mass Transfer, Journal Year: 2024, Volume and Issue: 236, P. 126318 - 126318

Published: Oct. 20, 2024

Language: Английский

Citations

3
Hierarchical sheet triply periodic minimal surface lattices: Design, performance and optimization DOI
Hong Xu, Yu Zhang, Yang Mei

et al.

Applied Thermal Engineering, Journal Year: 2024, Volume and Issue: unknown, P. 125187 - 125187

Published: Dec. 1, 2024

Language: Английский

Citations

1
Effect of nickel and copper shells on mechanical properties of advanced lightweight TPU metamaterials during uniaxial compression DOI Creative Commons
Salar Rohani Nejad,

Sania Hesari,

S.M.H. Mirbagheri

et al.

Scientific Reports, Journal Year: 2024, Volume and Issue: 14(1)

Published: Dec. 28, 2024

This study explores the impact of metallic shells by electroforming method on mechanical behavior thermoplastic polyurethane (TPU)-based lattice structures. First, TPU structures were printed additive manufacturing technique. Then layers Ni and Cu as a thin shell dressed in baths solutions. Finally, uniaxial compression tests achieved samples. Results demonstrated substantial enhancements performance attributable to these coatings. Notably, Ni-coated structure (Ni-LS) exhibited peak yield strength 4.55 MPa, marking 1.08-fold improvement over Ni-Cu-LS 1.35-fold increase relative Ni-Cu-Ni-LS variant. Furthermore, energy absorption density coated was elevated nearly sixfold compared uncoated lattice, with multi-layer coatings providing additional gains. These results underscore potential Cu-coated lattices deliver exceptional strength-to-weight ratios enhanced capabilities.

Language: Английский

Citations

1