Article
Engineering, Chemical
Raviraju Vysyaraju, Arjun Kumar Pukkella, Sivakumar Subramanian
Summary: A newly introduced compact enhanced gravity Closed Spiral Classifier (CSC) is tested experimentally for the classification of slurries containing silica or iron ore fines. The device exploits the differential settling experienced by the particles that are carried by a fluid flowing through a closed rectangular spiral channel. The experimental observations are used to build regression models for key performance characteristics, aiding in scale-up and design studies.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Ji Qian, Qiongyu Chen, Min Hong, Weiqi Xie, Shuangshuang Jing, Yinhua Bao, Gang Chen, Zhenqian Pang, Liangbing Hu, Teng Li
Summary: The demand for stretchable batteries is increasing with the emergence of wearable and epidermal electronics. However, the development of stretchable batteries is a major challenge due to the brittle nature of battery components. This study presents a simple and effective strategy to fabricate stretchable electrodes and separator for Li-ion batteries using 3D printing technology. The resulting components exhibit 50% reversible stretchability and excellent mechanical and electrical performance.
Article
Chemistry, Multidisciplinary
Mario Palacios-Corella, Kalyan Ghosh, Edurne Redondo, Martin Pumera
Summary: To address the contemporary energy crisis, it is crucial to prepare supercapacitors quickly and cost-effectively to replace traditional batteries. This study demonstrates that carbon-based 3D-printed carbon electrodes combined with two polyoxometalates can enhance the capacitance by utilizing the exceptional properties of these polyoxometalates. Furthermore, the difference in the nature of the counter ions affects the capacitance and resistance of the materials, highlighting the importance of considering these factors during preparation.
Article
Thermodynamics
Haifeng Zhao, Hong Li, Xingang Li, Xin Gao
Summary: Microwave-assisted reactions have high reaction rates and selectivity compared to conventional reactions, but face challenges such as temperature non-uniformity and low utilization efficiency. By optimizing equipment parameters and introducing bubbles, temperature uniformity can be improved.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Y. K. Chong, Y. Y. Liang, W. J. Lau, G. A. Fimbres Weihs
Summary: This study investigates the impact of spacer geometry on the performance of reverse osmosis membrane modules. It finds that column nodes provide better mass transfer efficiency compared to spherical nodes, and increasing the size of column nodes can further enhance the mass transfer and wall shear, albeit at the expense of higher global friction factor. Full-scale analysis shows that column nodes yield higher average flux in sea water reverse osmosis systems at high feed inlet velocity.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Engineering, Chemical
Morteza Eyvazi, Farzaneh Asaadi, Sepideh Akhbarifar, Mohammad Reza Yousefi, Mansour Shirvani, Seyed Hassan Hashemabadi, Arash Khalaf Rezaei
Summary: This study experimentally and numerically investigated the efficiency and pressure drop of a spiral-channel dust separator. The results showed that this separator has a high separation efficiency for high concentrations of black powder, reaching up to 86% for the finest particles. The simulations also demonstrated that adjusting the swirling angle of the channels can reduce the pressure drop with minimal impact on the separation efficiency.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2023)
Article
Engineering, Chemical
Y. K. Chong, Y. Y. Liang, G. A. Fimbres Weihs
Summary: 3D-CFD simulations are conducted on a membrane channel with different twisted feed spacer geometries. The results show that twisted spacers enhance vortex generation and reduce stagnant zones, resulting in a higher Sherwood number and lower friction factor compared to conventional ladder-type spacers. The RR-twisted spacer outperforms the LL- and LR-twisted spacer types due to the alignment of concave surfaces towards the channel center, creating stronger vortices downstream. The study also reveals that the number of twists and attack angle have an impact on the performance of the membrane channel.
Article
Chemistry, Multidisciplinary
Ting Jiang, Bo Yan, Minzheng Jiang, Buguang Xu, Yi Xu, Yueqiang Yu, Tingang Ma, Hao Wang
Summary: A novel forming method of enhanced adhesion-efficient demolding integration is proposed and experimentally verified, showing superior performance in enhancing adhesion and improving demolding efficiency.
APPLIED SCIENCES-BASEL
(2022)
Article
Nanoscience & Nanotechnology
Raul A. Marquez, Kenta Kawashima, Yoon Jun Son, Roger Rose, Lettie A. Smith, Nathaniel Miller, Omar Ali Carrasco Jaim, Hugo Celio, C. Buddie Mullins
Summary: This study investigates the impact of electrode and surface design on the performance of water electrolysis by modifying extrinsic electrode properties and studying bubble release effects. Robust and cost-effective electrodes are fabricated through 3D printing and metal deposition. The results demonstrate that modifying electrode geometry, size, and electrolyte flow rate can decrease overpotential and result in different bubble diameters and lifetimes. The suitability and stability of ordered, Ni-coated 3D porous structures are also confirmed. Additionally, this study demonstrates the effectiveness of 3D-printed electrodes for testing electrocatalytic materials while extrinsic properties are controlled.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Engineering, Chemical
Chuanjun Han, Yang Hu, Wenying Li, Qin Bie
Summary: In this study, a 3D printed guide vane cyclone separator was designed to investigate the separation efficiency, turbulent kinetic energy, and particle movement. The results revealed that the tangential velocity played a major role in the separation process, and the bottom of the exhaust pipe was the main region for gas-solid separation and pressure drop. The separation efficiency and pressure drop were positively correlated with the inlet velocity and the particle radius of the fluid.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Engineering, Chemical
Debanik Bose, Indradev Kumar, Abhiram Hens
Summary: In this study, the performance analysis of methanol steam reforming with different miniature-scale reformer geometries was investigated. It was found that the spiral and serpentine-type reactors exhibited higher methanol conversion due to the bending in the tubular reactor, which enhanced the mixing and led to higher conversion.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2023)
Article
Engineering, Biomedical
Vincent Fitzpatrick, Zaira Martin-Moldes, Anna Deck, Ruben Torres-Sanchez, Anne Valat, Dana Cairns, Chunmei Li, David L. Kaplan
Summary: The study aimed to use functionalized 3D-printed scaffolds for bone regeneration, incorporating silk-hydroxyapatite bone cements and various growth factors. Functionalities were assessed through cellular differentiation, migration, and proliferation, identifying synergistic effects among the growth factors.
Article
Engineering, Manufacturing
Qiaolei Li, Xiantian Meng, Xuechun Zhang, Jingjing Liang, Chaowei Zhang, Jinguo Li, Yizhou Zhou, Xiaofeng Sun
Summary: This study successfully prepared Al2O3-based ceramic cores with mullite reinforcement using 3D printing technology. By adjusting the sintering temperature and doping amount of fused silica, the in-situ synthesis of mullite was achieved. The resulting cores exhibited improved properties, such as higher open porosity, suitable bending strength, and reduced sintering shrinkage.
ADDITIVE MANUFACTURING
(2022)
Article
Energy & Fuels
Biao Sun, Tejas Bhatelia, Ranjeet P. Utikar, Geoffrey M. Evans, Vishnu K. Pareek
Summary: The hydrodynamic performance of a 3D printed structured packing SpiroPak was investigated, showing higher surface area and lower pressure drop compared to commercial packing. Experimental results demonstrated that SpiroPak can reduce dry pressure drop by approximately 50%, with key design parameters including reducing corrugation size to increase surface area and increasing the gap size to reduce the pressure drop.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2021)
Article
Mathematics, Applied
Marco Frego
Summary: This article presents the extension of the clothoid curve (Euler spiral) from the planar case to three dimensions. The curve is parametrized by arc length and its curvature and torsion are linear functions of the arc length. The problem is modeled as a linear time variant system and its stability is studied using Lyapunov techniques. Closed form solutions using Fresnel integrals are introduced for the first time and are applicable to a wide range of clothoids. For other cases, numerical methods based on Lie algebra, Magnus expansions, and Commutator-Free expansions are provided. These geometric integrators are optimized for efficient implementation and significantly impact real-time applications, particularly in trajectory design for flying vehicles.
APPLIED MATHEMATICS AND COMPUTATION
(2022)