Article
Engineering, Chemical
Qiang Zhao, Duanxu Hou, Baoyu Cui, Dezhou Wei, Tao Song, Yuqing Feng
Summary: The study developed an integrated multichannel inlet design for hydrocyclones, which significantly improves flow field symmetry, reduces short-circuit flow and circulation flow, and provides strong particle separation effects. Compared to traditional designs, the novel spiral inlet exhibits superior classification performance, including smaller cut-size, higher cut sharpness, and higher capacity.
ADVANCED POWDER TECHNOLOGY
(2021)
Article
Engineering, Chemical
Peikun Liu, Wenxiu Fu, Lanyue Jiang, Yuekan Zhang, Xiaoyu Li, Xinghua Yang, Bo Chen
Summary: This study uses numerical simulation to investigate the effect of overflow back pressure on the internal flow field and separation performance of hydrocyclones. The results indicate that increasing the overflow back pressure leads to higher energy consumption, increased solid phase yield, higher content of fine particles, lower content of coarse particles, and reduced separation accuracy of the hydrocyclones.
Article
Mechanics
Gaurav Sharma, Joseph Majdalani
Summary: The study utilized a finite-volume solver to simulate cyclonic motion in a cylindrical vortex chamber, demonstrating the accuracy of numerical simulations through comparison with theoretical results. Additionally, a parametric study systematically investigated the impact of nozzle variations on internal flow characteristics.
Article
Engineering, Chemical
Lanyue Jiang, Peikun Liu, Yuekan Zhang, Xiaoyu Li, Xinghua Yang, Duanxu Hou, Bo Chen
Summary: The optimization of cone section structure is crucial for improving the separation performance of hydrocyclones, and the combination of multiple cone angles has more advantages than a single cone angle. In this study, CFD technology was used to simulate a biconical hydrocyclone with different cone section combinations. The influence of the combination form on internal multiphase flow motion was analyzed, and the effects of the structural parameters of double-cone hydrocyclone on separation efficiency were explored. The results showed that changing the cone section transition diameter could decrease the cut size, increase the total separation effectiveness, and improve the accuracy of separation.
Article
Engineering, Environmental
Wenjie Lv, Jinchao Zhao, Mingxun Hao, Junyi Liu, Yanhong Zhang, Jiayu Zheng, Bi Su, Yiwei Wang, Yuan Huang
Summary: This paper presents a triple hydrocyclone pre-sequencing grading system for treating waste drilling fluid, which employs a swirl particle arranger to enhance classification and recovery of barite particles. Experimental results show that the inclusion of a cylindrical arranger in front of the hydrocyclone increases the recovery rate of barite by 5.7% to 75.0%. The optimal classification performance is achieved when the arranger cone angle is 6, with a significant reduction in solid content and a high barite recovery rate. This technology enables deep removal of drilling cuttings, efficient recovery of barite, and recycling of bentonite.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Engineering, Aerospace
Xuan Bai, Baigang Mi
Summary: A new efficiency enhancement method is proposed based on the prepositive synergistic bulge of the submerged inlet's anterior lip. By diverting part of the low-energy boundary layer airflow away from the inlet's entrance, the flow separation after entering the inlet is greatly reduced, improving the internal flow performance of the submerged inlet. The method has the advantage of small additional drag.
Article
Engineering, Chemical
Andreas Hakansson
Summary: This study investigates the factors affecting drop breakup in high-pressure homogenizer valves and explores the feasibility of enhancing drop breakup by simple design modifications. The results show that under standard conditions, the drop deformation is negligible, and under extreme conditions, a slight deformation may occur but cannot be achieved through simple design modifications.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2022)
Article
Green & Sustainable Science & Technology
Ajeet Pratap Singh, Amit Kumar, Akshayveer, O. P. Singh
Summary: This study aims to improve the energy conversion efficiency of solar energy devices through design innovations, introducing a new component - bell-mount inlet - which significantly enhances the system's thermal performance and turbine power output, making the solar device more compact and efficient.
Article
Energy & Fuels
Jose Francisco Gonzalez Alvarez, Efren Alonso Fernandez
Summary: This study analyzes the flow field during combustion using oxy-combustion in conditions similar to Matiant combustion chambers. Methodology involves CFD simulations with detailed reaction mechanisms and models, considering different working fluids and pressures. Findings show that temperature differences decrease with increasing operating pressure in Matiant cycles.
Article
Engineering, Aerospace
Fu-qiang Chen, Xiao-dong Ren, Yu-hong Li, Chun-wei Gu
Summary: Total pressure loss and vortex pair are two independent flow phenomena that affect the flow quality at the compressor L-inlet duct (CLID), and they have impacts on compressor efficiency, aerodynamic stability, and surge margin. However, there is no general report on controlling these flow phenomena in the open literature. In this study, a wind tunnel test bench is built to investigate the CLID internal flow using both Particle Image Velocimetry (PIV) and numerical simulation. The effects of various parameters on CLID aerodynamic stability are examined, and an optimized design is achieved through parametric sensitivity analysis and orthogonal design methods.
AEROSPACE SCIENCE AND TECHNOLOGY
(2023)
Article
Green & Sustainable Science & Technology
Arihant Sonawat, Young-Seok Choi, Kyung Min Kim, Jin-Hyuk Kim
Summary: This study investigated the performance of Positive displacement turbine and the influence of different cross-sectional shaped pipes on its overall performance. It was found that certain cross-sectional shaped pipes could significantly reduce flow pulsations and increase hydraulic efficiency.
Article
Engineering, Marine
Bo Yang, Sami Kaidi, Emmanuel Lefrancois
Summary: This study investigates the hydrodynamics of ships in confined bending channels using numerical simulations. The results show that the channel radius has a significant effect on the yaw moment, while the slope angle only affects the hydrodynamics below a certain threshold. Additionally, longer ships experience stronger spiral currents compared to shorter ships in the same channel configuration. The velocity of the current significantly affects both the resistance and yaw moment, with a critical velocity for sway force.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Thermodynamics
Anna Pacak, Blazej Baran, Korneliusz Sierpowski, Ziemowit Malecha, Demis Pandelidis
Summary: This paper proposes a computational fluid dynamics-based method to determine pressure drop and air distribution characteristics in recuperative exchangers. Numerical calculations were performed on a counter-flow heat exchanger with a complex structure, and empirical calculations were also conducted for comparison. The results showed that the numerical method accurately predicted pressure drop within the uncertainty of experimental data, while the accuracy of the empirical method depended on the assumptions made.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Engineering, Mechanical
Fraser B. Jones, Dale W. Fox, David G. Bogard
Summary: The present study shows that the separation regions at the inlet of film cooling holes, caused by traditional machining, are a major cause of performance variation. By leveraging additive manufacturing (AM) technologies, the addition of a radius fillet to the inlet significantly improves diffuser usage and reduces variability in performance. Another AM design with a large radius of curvature inlet effectively reduces biasing caused by crossflow.
JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME
(2023)
Article
Energy & Fuels
Oscar Tenango-Pirin, Sierra Espinosa, Juan Carlos Garcia, Jose Alfredo Rodriguez
Summary: Gas turbine combustors are prone to combustion instabilities due to changes in operating conditions and components, which can affect exhaust emissions. This study focuses on numerically simulating non-premixed combustion to analyze exhaust gases and temperature fields under unsteady inlet airflow conditions. The results show that the temperature and pressure in the combustor are highly sensitive to the inlet air pressure condition, and emissions of flue gases like CO and NOx are also affected. The study suggests that pressure oscillations can lead to flashback effects and impact the combustion and emissions in gas turbine combustors.
Article
Engineering, Chemical
Ri Zhang, Shasha Zhang, Mengyan Ding
Summary: A thin liquid film method is proposed to evaluate sand erosion in annular flow. This method considers the direct interaction between the liquid film and gas core, as well as the entrainment and deposition of droplets. The erosion rate is calculated by considering the effects of liquid entrainment and particle velocity decay. The method is fully verified by comparing with experimental data.
Article
Engineering, Chemical
Yu Suo, Xianheng Su, Wenyuan He, Xiaofei Fu, Zhejun Pan
Summary: This research investigates the mechanical properties of sandstone-shale composite through orthogonal experimental method and discrete element simulation. The results show that different lithologies and thickness ratios can affect the strength and fracture mode of the composite rock samples.
Article
Engineering, Chemical
Maurizio Troiano, Andrea El Hassanin, Roberto Solimene, Alessia Teresa Silvestri, Fabrizio Scala, Antonino Squillace, Piero Salatino
Summary: This study investigates the potential of Fluidized Bed Finishing (FBF) for square flat AlSi10Mg specimens manufactured via Laser-Powder Bed Fusion (L-PBF) additive manufacturing technology. The results show that good finishing can be achieved using rotation-assisted tests, with a maximum reduction of surface roughness by 67%. Steel particles are found to be the most effective bed material.
Review
Engineering, Chemical
Ningbo Song, Wanzhong Yin, Jin Yao
Summary: Seawater's dissolved salts and minerals have various effects on the flotation process, including influencing the characteristics and behavior of flotation factors, as well as affecting the surface of sulfide minerals. In most cases, seawater has adverse effects on the flotation of sulfide minerals, but these effects can be mitigated by adjusting the reagents.
Article
Engineering, Chemical
Kaiqiao Wu, Shuxian Jiang, Victor Francia, Marc-Olivier Coppens
Summary: In rectangular and cylindrical annular fluidized beds, pulsating gas flow can create regular bubble patterns, overcoming challenges seen in conventional units. This study provides new opportunities for modularization of fluidized bed operations.
Article
Engineering, Chemical
Shuo Li, Huili Zhang, Jan Baeyens, Miao Yang, Zehao Li, Yimin Deng
Summary: The paper assesses the behavior of cohesive Geldart C-type particles when fluidized by air with the aid of vibration. It determines that mechanical vibration is a simple and effective method to improve the fluidity of cohesive particles during fluidization.
Article
Engineering, Chemical
Zhenfei Feng, Qingyuan Zhang, Shanpan Liang, Zhenzhou Li, Fangwen Guo, Jinxin Zhang, Ding Yuan
Summary: A new micro/mini-channel heat sink (MCHS) with a combined structure of longitudinal and transverse vortex generators is designed, using Al2O3 nanofluid as the working medium. The study explores the effects of transverse vortex generator shape and longitudinal vortex generator angle on the hydraulic and thermal characteristics, comprehensive performance, entropy generation, and exergy efficiency. The results show that the triangular transverse vortex generator improves the comprehensive performance and exergy efficiency. Combined with the longitudinal vortex generator, the MCHS achieves the best comprehensive performance, entropy generation, and exergy efficiency when the Reynolds number is 742.
Article
Engineering, Chemical
Kostas Giannis, Christoph Thon, Guoqing Yang, Arno Kwade, Carsten Schilde
Summary: This study presents a 3D convolutional neural network (3D-CNN) methodology for generating realistic 3D models of particles. The method trains on 2D projections of particle images to predict their 3D shapes, and evaluates the accuracy of the predictions using Fourier shape descriptors (FSDs). This methodology has wide applications in particle shape analysis.
Article
Engineering, Chemical
Zheng-qing Zhou, Lu-jia Chai, Yu-long Zhang, Ya-bin Wang, Ze-chen Du, Tian-yi Wang, Yu-zhe Liu
Summary: The dynamic oxidation and shell-breaking processes of aluminum nanoparticles (ANPs) during heating were studied using in situ transmission electron microscopy. The results revealed that the changes in shell thickness can be divided into three stages, and the active aluminum content of ANP decreased before shell-breaking.
Article
Engineering, Chemical
Fulei Chen, Huaqing Ma, Zihan Liu, Lianyong Zhou, Yongzhi Zhao
Summary: A particle breakage model based on the particle replacement scheme, using the polyhedral model to describe particles, is proposed in this work to accurately describe the breakage of a large number of particles. Additionally, a fast-cutting algorithm is proposed to reproduce the size distribution of progeny particles determined by the breakage model. The validation and simulation results show satisfactory accuracy, efficiency, and stability of the algorithm.
Review
Engineering, Chemical
Matteo Errigo, Christopher Windows-Yule, Massimiliano Materazzi, Dominik Werner, Paola Lettieri
Summary: Gas-solid fluidized-bed systems have advantages in terms of chemical reaction efficiency and temperature control, making them widely used in industrial applications. However, the design, scale-up, and optimization of these complex units are limited by the lack of deep physical understanding. Non-invasive and non-intrusive diagnostic techniques provide a way for researchers to study these systems without affecting the flow field or directly contacting the medium under study.
Article
Engineering, Chemical
Saeed Fateh, Mohammad Behshad Shafii, Mohammad Najafi, Cyrus Aghanajafi
Summary: Applying a magnetic field to ferrofluids alters their flow characteristics and enhances heat transfer. Through visualization and quantitative investigation, it is found that the magnetic field influences the flow patterns and velocity profiles, improving fluid mixing and vorticity magnitude.
Article
Engineering, Chemical
Lei Gao, Bingbing Wei, Xiaochuan Hu, Zaifeng Yao, Yiwen Fang, Xuejian Gao
Summary: In this study, a numerical model of sand triaxial test was established using discrete element software PFC3D, and an indoor triaxial test was conducted to calibrate the numerical model. The influence of microscopic parameters on the macroscopic mechanical response of sand was analyzed. The results showed that the friction coefficient had the greatest impact on the peak strength and residual strength of the sand's stress-strain curve, and it was positively correlated. The normal tangential stiffness ratio was negatively correlated, while the porosity and boundary flexibility stiffness had minimal influence on it.
Article
Engineering, Chemical
Xuan Liu, Jie Gong, Kai Jiang, Xiaojuan Lai, Yu Tian, Kang Zhang
Summary: This study aimed to improve the performance of lignite coal water slurries (CWSs) by synthesizing a series of three-arm amphiphilic block copolymers. By controlling the relative molecular weight, hydrophilic/hydrophobic ratio, and ionic group content, the apparent viscosity of CWSs was significantly reduced and the static stability was improved. Thermogravimetric testing and XPS analysis were conducted to reveal the mechanism behind the improved performance.
Article
Engineering, Chemical
Lanka Dinushke Weerasiri, Daniel Fabijanic, Subrat Das
Summary: Fluidization at low pressure offers significant benefits for the fine chemical industry. This study investigates the behavior of bubbles and bed expansion under low pressure conditions. It is found that lower pressure leads to larger bubbles, increased bubble quantity, and higher aspect ratio. The predictability is affected by the inhomogeneous fluidization, but low pressure fluidization can generate similar bubble sizes with lower fluidizing mass compared to atmospheric pressure.