Article
Thermodynamics
Minsub Han
Summary: This paper presents a new technique for calculating microscopic local fluxes that provides a robust and accessible way to obtain the streamwise fluxes in general flows. Despite significant progress in the research on flux calculation, there are still issues regarding the fluxes in the flow direction.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Mechanics
Jinggang Zhang, Xitong Zhang, Wei Zhao, Haihu Liu, Youhua Jiang
Summary: In this study, the generation of surfactant-laden droplets in a T-junction was simulated using a lattice Boltzmann method. The concentration of surfactants was found to affect the droplet generation regime, shifting from squeezing to dripping and then to jetting as the surfactant concentration increases. The influence of surfactants on the upstream pressure and the role of surfactants under different capillary numbers were also investigated. Additionally, phase diagrams were established to describe the variation of the droplet generation regime with flow rate ratio and capillary number in both clean and surfactant-laden systems.
Article
Engineering, Environmental
Ruoqian Zhou, Hainan Wang, Xiaoheng Li, Danlong Li, Wenjian Wang, Yannan Liang, Xiaokang Yan, Haijun Zhang
Summary: This paper investigates the flotation behavior of modified quartz particles with different sizes but similar surface hydrophobicity under various energy input conditions by employing a torque sensor to measure energy input in a flotation machine. Numerical simulations of the mechanical flotation machine were conducted to obtain the fluid dynamic characteristics, and the potential collision, attachment, and detachment behaviors of particles of different sizes were analyzed. The results show that the recovery of intermediate-sized particles is optimal under different energy input conditions, and as the particle size increases, the energy input required for optimal recovery decreases.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Mechanics
Chandranath Banerjee, Kaustav Chaudhury, Emmanuel Cid, Florent Bourgeois, Suman Chakraborty, Arun Majumder, Eric Climent
Summary: Tangential introduction of liquid results in a swirling flow within a cylindro-conical hydrocyclone. Through experiments and simulations, we discovered that an air column submerged in the water flow field inside the hydrocyclone exhibits oscillating behavior similar to that of an elastic beam. By establishing a scaling relationship, we obtained a correlation between the wavelength and air-core radius.
Article
Chemistry, Physical
Amirhosein Mosavi, Majid Zarringhalam, Davood Toghraie, Amin Rahmani, Aliakbar Karimipour
Summary: Roughness elements aid in distributing boiling thermal forces to fluid atoms in central layers of microchannels, particularly at high time steps, and higher wall temperatures lead to a slight decrease in velocity but do not disrupt the boiling flow properties of Argon.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Thermodynamics
Yong Guo, Chuan-Yong Zhu, Liang Gong, Zong-Bo Zhang
Summary: The effect of surface roughness on the thermal-hydraulic performance of flow boiling in microchannel was investigated using the Fourier series method to generate a surface with random roughness, and the VOF model and Lee model were used for simulation. The results showed that increasing relative roughness initially increased and then decreased Nu and fRe. Microchannels with rough surfaces achieved better thermal-hydraulic performance than those with smooth surfaces. The best thermal-hydraulic performance was observed at a relative roughness of 0.304%. Additionally, increasing the mean width of roughness elements resulted in gentler surface undulation, slower growth rate of Nu, and monotonously increasing fRe. Furthermore, decreasing inlet velocity led to drying up of the liquid film at the bottom of bubbles, resulting in drought spots on the bottom wall and deteriorated heat transfer performance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Engineering, Chemical
Kaihui Cui, Kun Huang
Summary: The study reveals that the extraction and separation behaviors of target metal ions in microchannels are closely related to the changes in hydrodynamic parameters of the organic and aqueous phases, which can be controlled to achieve controllable separation of target ions.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Engineering, Chemical
Jiahui Hao, Yanjie Li, Yi Liu, Jennifer S. Curtis, Yu Guo
Summary: This study examines the jamming phenomenon in shear flows of cylindrical particles with different size distributions and found that at the jamming volume fraction, stress fluctuation and granular temperature reach their maximum values, while the alignment degree of cylindrical particles reaches a minimum.
ADVANCED POWDER TECHNOLOGY
(2021)
Article
Materials Science, Coatings & Films
Hamed Jamshidi Aval
Summary: This article investigates the application of the SPH model to AA6061 aluminum coating by friction surfacing, showing that the SPH model accurately simulates the coating profile compared to the ALE model.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Multidisciplinary Sciences
Liang Wu, Zhijian Liang, Ming Chen
Summary: Through model experiments and numerical simulations, the study observed and evaluated the motion of blasted blocks under the influence of underwater blasting. The results showed that the blocks formed a bulge and some shrunk during the initial period of bubble pulsation. With increased charge, the blast load caused significant vertical motion and increased horizontal displacement of the blasted blocks in the throwing direction.
SCIENTIFIC REPORTS
(2023)
Review
Computer Science, Interdisciplinary Applications
Gaurav D. Dhadse, Gangadhar Ramtekkar, Govardhan Bhatt
Summary: The interface at the soil-structure junction is crucial to accurately model settlement and horizontal displacement. A thin layer interface, formed due to slipping and rolling of particles near the structure, plays a significant role in the behavior of soil-structure interaction (SSI) systems. The appropriate consideration of thickness for this thin layer interface is essential, as an incorrect thickness choice can lead to improper force distribution in the SSI system. This paper reviews and discusses the importance, advantages, and limitations of properly representing the thin layer interface thickness in SSI modeling.
ARCHIVES OF COMPUTATIONAL METHODS IN ENGINEERING
(2023)
Article
Mathematics
Dongmei Chen, Jianzhong Lin
Summary: The equilibrium position yep/H of particles in microchannel flow with an obstacle is studied using lattice Boltzmann method. The results show that the particle will migrate downstream in a different lateral position depending on the initial position and the value of β. However, in the flow far downstream from the obstacle, the particles tend to have the same position yep/H when n, Re, and k are fixed.
Article
Mathematics, Interdisciplinary Applications
Angelantonio Tafuni, Maria Grazia De Giorgi, Alessandro De Rosis
Summary: Numerical simulations of steady and unsteady viscous flows are presented using two different numerical methodologies, showing good accuracy compared to other well-established computational methods. Despite lacking key strategies commonly used in grid-based methods, such as adaptive mesh refinement, the proposed methods are able to capture relevant flow physics effectively.
COMPUTATIONAL PARTICLE MECHANICS
(2022)
Article
Engineering, Chemical
Pranava Chaudhari, Ashish Kapoor, Yashraj Awasthi, Amit K. Thakur, Rahul Kumar
Summary: This research investigates the effect of microchannel geometry on fluid flow behavior. The results show that the channel geometrical configuration and the Reynolds number significantly affect fluid flow behavior.
INTERNATIONAL JOURNAL OF CHEMICAL REACTOR ENGINEERING
(2023)
Article
Biotechnology & Applied Microbiology
Shuai Wang, Huiyan Zhu, Gexi Zheng, Feng Dong, Chongxuan Liu
Summary: This study used multidimensional imaging and numerical simulation approaches to investigate the complex relationship between biofilm detachment and hydrodynamics. The results revealed that local biofilm morphology and hydrodynamic flow conditions collectively controlled the detachment rate. The findings provide a quantitative understanding of biofilm detachment processes in natural environments.
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Nader Laal Dehghani, Rajesh Khare, Gordon F. Christopher
Article
Engineering, Chemical
Ashwin Ravichandran, Rajesh Khare, Chau-Chyun Chen
Article
Engineering, Chemical
Nazir Hossain, Ashwin Ravichandran, Rajesh Khare, Chau-Chyun Chen
Article
Chemistry, Physical
Fardin Khabaz, Yong Zhang, Lianjie Xue, Edward L. Quitevis, Edward J. Maginn, Rajesh Khare
JOURNAL OF PHYSICAL CHEMISTRY B
(2018)
Article
Chemistry, Physical
Ashwin Ravichandran, Chau-Chyun Chen, Rajesh Khare
JOURNAL OF PHYSICAL CHEMISTRY B
(2018)
Article
Engineering, Chemical
Sina H. Saravi, Ashwin Ravichandran, Rajesh Khare, Chau-Chyun Chen
Article
Polymer Science
April L. Fogel, Ashwin Ravichandran, Sriramvignesh Mani, Bishal Upadhyay, Rajesh Khare, Sarah E. Morgan
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
(2019)
Article
Mechanics
Dinesh Sundaravadivelu Devarajan, Pouria Nourian, Gregory B. McKenna, Rajesh Khare
JOURNAL OF RHEOLOGY
(2020)
Article
Thermodynamics
Ashwin Ravichandran, Hla Tun, Rajesh Khare, Chau-Chyun Chen
FLUID PHASE EQUILIBRIA
(2020)
Article
Physics, Applied
S. N. Sami, R. Islam, R. Khare, R. P. Joshi
Summary: Carbon fibers are considered as a superior cathode material with low outgassing in high-power systems, and model-based assessments suggest that they exhibit good performance in diffusion of hydrogen, especially at high temperatures. Experimental results show that the diffusion coefficients for hydrogen in carbon fibers demonstrate significant improvement compared to copper, indicating their potential suitability for high temperature operation in microwave and pulsed power systems.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Mechanics
Pouria Nourian, Rafikul Islam, Rajesh Khare
Summary: The study identified eight conditions for the successful implementation of probe rheology technique in molecular simulations, with the two most important being that the peak in the probe displacement should occur at the same frequency as the applied force, and that the magnitude of the external force driving the probe motion should be comparable to the hydrodynamic friction force experienced by the probe particle. The validity of the procedure was demonstrated by applying it to determine the viscoelastic properties of a weakly entangled polymer melt system.
JOURNAL OF RHEOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Rafikul Islam, Sriramvignesh Mani, Rajesh Khare
Summary: This study utilized atomistic molecular dynamics simulations to investigate the effects of PSF support on the volumetric properties and chain dynamics in thin films of polyacrylate, as well as on the dynamics of water and ethanol molecules. The results indicate that the dynamics of polyacrylate layers at the interface are influenced by the support polymer, with implications on penetrant transport through the supported films, thus impacting the separation characteristics of the membranes.
ACS APPLIED POLYMER MATERIALS
(2021)
Article
Mechanics
Jeffrey G. Ethier, Pouria Nourian, Rafikul Islam, Rajesh Khare, Jay D. Schieber
Summary: The text discusses extracting viscoelastic properties of a complex fluid using single-particle microrheology by embedding a micrometer-sized particle and tracking its motion through the fluid. It introduces a simple correction to the GSE equation to improve accuracy in molecular dynamics simulations. The corrected HSE equation allows for smaller box sizes, significantly reducing computational costs.
JOURNAL OF RHEOLOGY
(2021)
Article
Mechanics
Dinesh Sundaravadivelu Devarajan, Rajesh Khare
Summary: In this study, molecular dynamics simulations and probe rheology techniques were used to investigate the linear viscoelasticity of nanocolloidal suspensions. The viscoelastic properties were determined by analyzing the probe motion and using continuum mechanics. The results from active and passive probe rheology simulations were in good agreement with oscillatory nonequilibrium MD simulations and theoretical predictions from literature. Artificial hydrodynamic interactions and probe size were found to affect the simulation results.
JOURNAL OF RHEOLOGY
(2022)
Article
Chemistry, Physical
Adegbola Balogun, Daria Lazarenko, Fardin Khabaz, Rajesh Khare
Summary: Molecular dynamics simulations are used to investigate the dynamic and rheological properties of an imidazolium-based ionic liquid. The results show good agreement between simulation and experiment, with the application of time-temperature superposition to collapse the data onto master curves. It was observed that the IL displays different viscoelastic responses at different temperatures and frequencies.