Article
Chemistry, Multidisciplinary
Manuel Somoza, Ramon Rial, Zhen Liu, Iago F. Llovo, Rui L. Reis, Jesus Mosqueira, Juan M. Ruso
Summary: This study successfully created doped Hydroxyapatite nanoparticles with magnetic properties using microfluidics and Gadolinium as a contrast agent for medical applications. Computational Fluid Dynamics (CFD) was used to ensure the system worked in the laminar regime and nanoparticles diffused uniformly. The biomaterials were characterized using XRD, FE-SEM, EDX, confocal Raman microscopy, and FT-IR, confirming the successful incorporation of Gadolinium. Magnetic characterization confirmed the paramagnetic behavior of the nanoparticles, showing the potential for advanced nanomaterials in theragnostic applications.
Article
Water Resources
M. Cihan Aydin, Ali Emre Ulu
Summary: This study used CFD technique to analyze the two-phase flow model of siphon-shaft spillways, and found that aeration can effectively reduce siphon sub-pressures and cavitation. The optimal relative aeration diameter of 0.45 was identified as providing sufficient air entrainment to protect from cavitation without significantly decreasing discharge performance.
APPLIED WATER SCIENCE
(2021)
Review
Engineering, Marine
Brijkishore, Ruchi Khare, Vishnu Prasad
Summary: Cavitation is a major issue in hydraulic reaction turbines, leading to damage and performance issues. Further research is needed to minimize the impact of cavitation. Predicting and mitigating cavitation in turbines is essential for design and operation, with various techniques available for prevention.
Article
Energy & Fuels
Chaiyanan Kamsuwan, Xiaolin Wang, Lee Poh Seng, Cheng Kai Xian, Ratchanon Piemjaiswang, Pornpote Piumsomboon, Yotsakorn Pratumwal, Somboon Otarawanna, Benjapon Chalermsinsuwan
Summary: Waste heat utilization is prioritized in various industries and sectors. Researchers have developed heat recovery processes using water as coolants in waste heat recovery units, such as heat exchangers. The microchannel heat exchanger is a solution to the limitations of conventional heat exchangers.
Article
Nuclear Science & Technology
Yu Zhang, Jiang Lai, Chao He, Shihao Yang
Summary: In this study, a new single-orifice plate with a convergent-flat-divergent hole was modeled, and a multi-objective optimization method was proposed to find the optimal designs that may have weak cavitation possibilities. The results indicated that the convergent angle of the single-orifice plate dominants the cavitation behavior globally.
NUCLEAR ENGINEERING AND TECHNOLOGY
(2022)
Article
Engineering, Marine
Joseph Mwangi Ng'aru, Sunho Park
Summary: This study focused on the computational study of cavitating flows around a marine propeller with energy saving equalizing ducts, revealing the significant effects of duct angles on propeller cavitation behavior and propulsion performance.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Mechanical
R. Khadem Hosseini, Sh Yareiee
Summary: This study identified the failure mechanisms of a nickel aluminum bronze butterfly valve used in a seawater desalination unit at a refinery plant through chemical analysis and microscopy examinations and used CFD and FSI to simulate the effects of valve opening on fluid behavior and stress distribution. The main failure mechanisms were found to be erosion corrosion and cavitation.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Marine & Freshwater Biology
Luis Carral, Maria Isabel Lamas-Galdo, Ma Jesus Rodriguez-Guerreiro, Andreina Vargas, Carlos Alvarez-Feal, Ivan Lopez, Rodrigo Carballo
Summary: Hydrodynamics is crucial for the evolution of artificial reefs, which can determine the geometry of a reef group for optimal water circulation and nutrient supply.
ESTUARINE COASTAL AND SHELF SCIENCE
(2021)
Article
Mechanics
Anoshanth Jeyasountharan, Gaetano D'Avino, Francesco Del Giudice
Summary: In this study, the effect of confinement ratio on the self-ordering dynamics of particles suspended in a viscoelastic liquid and flowing in a microfluidic channel is investigated through numerical simulations and experiments. The results show that the confinement ratio affects the self-ordering distance and relative particle velocity.
Article
Thermodynamics
Qingye Li, Chaoyong Zong, Fuwen Liu, Tianhang Xue, Ao Zhang, Xueguan Song
Summary: In this study, a modified cavitation model combining local flow characteristics, supervised learning, and genetic algorithms is proposed to investigate the cavitation flow characteristics of orifice plates under high-pressure conditions. The modified cavitation model eliminates the influence of the bubble diameter and nucleation site volume fraction on mass flow rate and achieves dimensionality reduction at the physical level. The relationship between evaporation/condensation coefficients and mass flow rate is constructed by supervised learning, and the two coefficients are determined using the genetic algorithm. The accuracy of the modified cavitation model is proved by calculating the mass flow rates within a 5% experiment error.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Acoustics
Peter Pipp, Marko Hocevar, Matevz Dular
Summary: Research on the potential of cavitation exploitation is interesting but complex, with computational fluid dynamics now being used to supplement experimental optimization. It is important for researchers to understand the complexities of numerical simulation and put in effort to obtain reliable results in cavitation simulations.
ULTRASONICS SONOCHEMISTRY
(2021)
Retraction
Chemistry, Multidisciplinary
Junjie Chen, Xuhui Gao, Longfei Yan, Deguang Xu
Summary: The study on computational fluid dynamics modeling of the millisecond methane steam reforming in microchannel reactors for hydrogen production by Junjie Chen et al. published in RSC Adv. 2018 has been retracted.
Article
Agricultural Engineering
Meir Teitel, Shay Ozer, Vered Mendelovich
Summary: This study presents computational fluid dynamics (CFD) results of airflow, temperature, and humidity patterns in an insect-proof screenhouse. The results showed significant differences in airflow in the upper region of the screenhouse, with large-scale rotating airflow formed in the center. The leeward section was found to be warmer and have a lower humidity ratio compared to the windward section.
BIOSYSTEMS ENGINEERING
(2022)
Review
Mechanics
Mori Mani, Andrew J. Dorgan
Summary: In this review, the increasing use of computational fluid dynamics in the aerospace industry for designing and studying aircraft is discussed. The importance of geometry, turbulence models, numerical algorithms, mesh adaptation, and design optimization is highlighted. Challenges and suggestions for investment in each area are provided. The review concludes by envisioning a future where certification by analysis and model-based design are standard practices, and emphasizing the necessary steps to lead the industry in that direction.
ANNUAL REVIEW OF FLUID MECHANICS
(2023)
Article
Mechanics
Ali Hosseinpour Shafaghi, Farzad Rokhsar Talabazar, Merve Zuvin, Moein Talebian Gevari, Luis Guillermo Villanueva, Morteza Ghorbani, Ali Kosar
Summary: Over the past decade, hydrodynamic cavitation has been widely utilized in various fields such as energy harvesting and biomedical applications. A new microfluidic device with eight parallel micro-orifices and roughness elements was designed to enhance cavitation inception and intensify cavitating flows. Different flow patterns including cavitation clouds, twin cavities, sheet cavities, and bubbly flows were observed as the cavitation number decreased in the experimental setup.
Article
Engineering, Mechanical
Chang Qiu, Zhi-xin Gao, Zhi-jiang Jin, Jin-yuan Qian
Summary: This paper investigates the effects of sleeve parameters on cavitation inside steam trap valves, and finds that the orifice diameter of the sleeve has the largest impact on cavitation intensity and vapor distribution. Improved geometrical parameters of the sleeve can effectively suppress cavitation inside the valve, recommending smaller diameter orifices, higher installation angle (up to 80 degrees), and greater thickness for better anticavitation performance. The study is significant for cavitation control and optimization design of steam trap valves.
JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME
(2022)
Article
Nuclear Science & Technology
Zhen-hao Lin, Cong-wei Hou, Liang Zhang, An-qi Guan, Zhi-jiang Jin, Jin-yuan Qian
Summary: This paper investigates the vibration characteristics of sleeve control valves by analyzing the lift coefficient of flow field and vibration of valve stem and plug using the fluid-structure interaction (FSI) method. The results indicate that the vortex moves downward and decreases in intensity as the valve opening increases, with the dominant shedding frequency occurring at around 449 Hz. The lift coefficient (CL) is highest at a small valve opening, reaching approximately 2400 at Lmin-op, while it is about 850 at Lmax-op. The total vibration level decreases on the stem and plug with the rising valve opening. The differences in vibration levels between M1 and M2 increase with the valve opening, reaching 25.47 dB and 8.48 dB on the X-axis and Z-axis, respectively. This research provides valuable insights for reducing vibration and noise in sleeve control valves.
ANNALS OF NUCLEAR ENERGY
(2023)
Article
Thermodynamics
Jin-yuan Qian, Wen-qing Li, Xiao-juan Li, Qian Chen, An-qi Guan, Kan Sheng, Zhi-jiang Jin
Summary: This paper analyzes the evolution process of droplet coalescence through microchannel experiments and the volume of fluid method, and studies the internal circulation characteristics of droplets under different surface velocities conditions. The results show that with the decrease of droplet length, the velocity distribution inside the droplet changes from being dominated by the shearing action of the microchannel wall to the shearing action of the continuous phase. During the droplet coalescence, there is a convective trend in the contact area between two droplets, with the maximum radial and axial velocities reaching 3.5 times and 7.5 times of the droplet surface velocity, respectively. This work can provide a reference for improving droplet control accuracy and mixing efficiency.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Engineering, Mechanical
Ji Lin, Jin Qian, Yu Xie, Ji Wang, Rui Xiao
Summary: In this study, a micromechanical mean-field shear transformation zone (STZ) model is developed to systematically describe the stress responses of amorphous polymers. The model captures the behaviors of amorphous polymers in various loading conditions and successfully reproduces the Bauschinger effect. The deformation-induced material polarization, in the form of an anisotropic distribution of STZs, is identified as the governing mechanism of the Bauschinger effect.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Engineering, Mechanical
An-Qi Guan, Jia-Xiang Xu, Zhi-Jiang Jin, Jin-Yuan Qian
Summary: Axial flow check valve (AFCV) is widely used in piping systems due to its small flow resistance, low noise, and good sealing performance. The study focuses on the transient closing characteristics of AFCV with damping structure in order to improve its service life and process safety. The effects of the structures of damping devices and the diameter of damping holes on the dynamic motion, fluid force, and damping characteristics are analyzed using dynamic mesh technology.
JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME
(2023)
Article
Chemistry, Multidisciplinary
Wen-qing Li, Xiao-juan Li, An-qi Guan, Zhi-jiang Jin, Jin-yuan Qian
Summary: A novel method based on periodic change of two-phase velocity for droplet coalescence in microchannels is proposed, which improves the mixing performance inside the coalesced droplet. The feasibility of the method is justified by investigating the droplet coalescence in different velocity pairs. The droplet pairs are alternatively generated by the periodic change of two-phase velocity, and the quantitative mixing of reagents can be achieved by precise control of the volume of droplet pairs.
JOURNAL OF FLOW CHEMISTRY
(2023)
Article
Nuclear Science & Technology
Jin -yuan Qian, Jia-xiang Xu, Li Fang, Lei Zhao, Jia-yi Wu, Zhi-jiang Jin
Summary: This paper analyzes the cavitation characteristics of a typical sleeve control valve based on the effects of throttling windows number and flow directions. The results show that increasing the throttling windows number can greatly reduce the vapor volume, and the vapor distribution is significantly different under different flow directions. By changing the flow direction from forward to backward and increasing the throttling windows number, the erosion and abrasion of the valve body caused by fluid impact can be reduced. This analysis is significant for the anti-cavitation design of control valves.
ANNALS OF NUCLEAR ENERGY
(2023)
Article
Thermodynamics
Jing-xian Kong, Chen Yang, Xin-ji Chen, Dong-yu Chen, Zhi-jiang Jin, Jin-yuan Qian
Summary: Energy crisis has hindered global economic development due to the unsustainability of non-renewable energy sources and the unreliability of renewable energy sources. Therefore, improving energy usage efficiency has become increasingly important. Heat is the largest energy end-use and optimizing heat transfer efficiency in tubular heat exchangers plays a crucial role. This study focuses on two new types of spiral spoilers, namely multi-channel spoilers and staggered spoilers, and investigates their thermohydraulic characteristics using numerical methods. Experimental validations were also carried out. The results show that both flow channels and deflecting angles contribute to better mixed fluid, leading to enhanced heat transfer but also increased irreversible loss. Multi-channel spoilers with a channel number of 2 and a pitch ratio of 1.5 strike the best balance between energy loss and heat transfer. Staggered spoilers with a deflecting angle of 15 degrees achieve the highest heat transfer enhancement, reducing irreversible loss by 45.07% compared to a deflecting angle of 120 degrees. Staggered spoilers outperform multi-channel spoilers, especially in laminar flow.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Energy & Fuels
Long-jie Yu, Xue-hua Yang, Zhi-xin Zhang, Zhen-hao Lin, Zhi-jiang Jin, Jin-yuan Qian
Summary: This study presents a parametric analysis on the structure of a conical throttling valve and its impact on hydrogen decompression performance. The results show that the cone angle and pressure difference significantly affect the flow patterns and flow characteristics of hydrogen. The optimized structure with a convex cylinder improves the flow patterns and hydrogen decompression performance.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Thermodynamics
Xin-ji Chen, Chen Yang, Jing-xian Kong, Feng-lei Wang, Zhi-jiang Jin, Jin-yuan Qian
Summary: This paper studies the application of spirally corrugated tube at low Reynolds number in heat exchangers. It is found that the structure of the tube can evenly distribute solid particles, achieving anti-fouling effect and improving heat exchange efficiency. The thermal-hydraulic characteristics of different sample points are analyzed and four representative sample points are selected. The effects of corrugation pitch ratio and depth ratio on convective heat transfer and fluid resistance are studied.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Jin-yuan Qian, Lei Zhao, Xiao-juan Li, Wen-qing Li, Zhi-jiang Jin
Summary: In this study, the characteristics of droplets including formation time, length, and mixing efficiency were investigated. The exchange between the dispersed phase velocity and the continuous phase velocity has a marginal effect on droplet formation time but a significant effect on droplet length. The mixing efficiency in the droplet forming stage can be classified into time-dominated and length-dominated regimes based on the droplet superficial velocity.
JOURNAL OF ZHEJIANG UNIVERSITY-SCIENCE A
(2022)
Article
Engineering, Electrical & Electronic
Qian Wu, Fengbo Zhu, Ziliang Wu, Yu Xie, Jin Qian, Jun Yin, Huayong Yang
Summary: This study presents a suspension printing strategy for the direct deposition of liquid metal into 3D dangling structures, as well as the use of acrylamide/nanoclay as a support bath and photo-curing agent, enabling the formation of high-fidelity and spatially resolved structures.
NPJ FLEXIBLE ELECTRONICS
(2022)
Article
Engineering, Mechanical
Ji Lin, Lu Dai, Jin Qian, Rui Xiao
Summary: This study developed a new constitutive model that incorporates segmental and chain dynamics into the deformation of amorphous polymers and describes the damage evolution and failure behavior. Experimental results compared to theoretical predictions show that the model can capture the observed rate-dependent features.
ACTA MECHANICA SINICA
(2022)
Article
Thermodynamics
Jia-lin Zang, Huai-yu Yao, Fu-hai Zhang, Zhi-yong Liu, Jin Meng, Jing-mei Zhu, Zhi-min Wang, Jin-yuan Qian
Summary: This study investigates the dynamic characteristics of pilot valves with different inlet diameters in the Main Steam Valve Set (MSVS) using dynamic mesh technology. It is found that increasing the inlet diameter can decrease the opening time of the pilot valves but increase the fluid force and movement speed. The analysis of pressure changes during the opening process shows that the inlet diameter affects the pressure rise speed and total response time.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
