Article
Engineering, Chemical
Ege Ertekin, John M. Kavanagh, David F. Fletcher, Dale D. McClure
Summary: This paper presents a model that accurately simulates the hydrodynamics of bubble columns and shows good agreement with experimental data. The study also takes into account the presence of surface-active compounds in industrial processes, providing computational predictions in line with experimental measurements. Furthermore, a dataset has been provided to facilitate validation work by others and identify areas for further research.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2021)
Article
Multidisciplinary Sciences
Li Chaoyue, Feng Shiyu, Xu Lei, Peng Xiaotian, Yan Yan
Summary: The use of nitrogen-enriched air (NEA) for scrubbing aviation fuel can reduce dissolved oxygen levels and counteract flammability in aircraft fuel tanks. Factors such as NEA bubble diameter, NEA superficial velocity, and fuel load were found to impact oxygen transfer between NEA and aviation fuel. The study provides insights into the mass transfer characteristics of aviation fuel scrubbing and can aid in the design of fuel scrubbing inerting systems.
SCIENTIFIC REPORTS
(2021)
Article
Engineering, Chemical
Xiaoping Guan, Ning Yang
Summary: Knowledge of bubble size distribution is crucial for controlling mass transfer and reaction in bubble column reactors. In this study, the effects of internals on the bubble size distribution were investigated through experiments and simulations. The experiments revealed a bimodal distribution of the volume-based bubble size distribution, which became more evident with the addition of internals. The simulations showed a decrease in turbulent dissipation rate and turbulent kinetic energy in the presence of internals. Additionally, the resolved portion of turbulent kinetic energy became the major component, indicating that internals redistribute turbulent kinetic energy in each scale, providing insights into the complex flow characteristics in the presence of internals and process intensification.
Article
Engineering, Chemical
Xiaoping Guan, Ning Yang
Summary: The effects of internals on flow regimes in a lab-scale bubble column were systematically investigated through six approaches. The study found that internals can affect the transitional superficial gas velocity and alter the gas-holdup structure significantly. A novel method based on wavelet analysis was proposed to demarcate the boundaries among different scales, leading to the identification of two transitional velocities and the extension of the transitional regime's operating window.
Article
Multidisciplinary Sciences
Rasool Pelalak, Ali Taghvaie Nakhjiri, Azam Marjani, Mashallah Rezakazemi, Saeed Shirazian
Summary: By using the adaptive neuro-fuzzy inference system (ANFIS) method to analyze gas-liquid flow, the study investigated the impact and complexity of different inputs on output parameters. The results showed that increasing the number of membership functions can improve model accuracy, X and Y computing nodes have similar impacts on gas fraction, while Z computing nodes have a uniform distribution of membership functions across the column.
SCIENTIFIC REPORTS
(2021)
Letter
Mechanics
Guo-Zhen Ma, Chun-Xiao Xu, Hyung Jin Sung, Wei-Xi Huang
Summary: This paper proposes a roughness scaling method based on the direct numerical simulation of turbulent channel flow over three-dimensional sinusoidal rough walls in a transitionally rough regime. A new coupling scale is defined and the relationships between various parameters are explored.
Article
Mechanics
Somasekhara Goud Sontti, Arnab Atta
Summary: We developed a computational fluid dynamics model based on the coupling of the level set and volume of fluid methods to study droplet formation in a square flow-focusing microchannel. By modifying the microchannel with a constricted orifice, we were able to manipulate droplet formation and flow regimes. We investigated the effects of geometrical confinement, flow rate, and interfacial tension on droplet characteristics and identified squeezing, dripping, and jetting as the three flow regimes observed.
Article
Engineering, Chemical
Nicolo Varallo, Giorgio Besagni, Riccardo Mereu
Summary: In this study, a computational fluid dynamics (CFD) Eulerian-Eulerian modeling approach was used to investigate the complex fluid dynamics phenomena in bubble columns. The model considered the drag force and the effects of bubble-bubble interactions. The role of the lift force in local flow properties was also studied.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Engineering, Chemical
Premsagar Pillajetti, Raghvendra Gupta, Sunil Goswami, Harish Jagat Pant, Nirvik Sen, Krishna Kumar Singh, Kalsanka Trivikram Shenoy, Rajesh Kumar Upadhyay
Summary: This study reports the local hydrodynamics inside PSPCs for the first time using the radioactive particle tracking technique, revealing the effects of pulsing velocity and liquid flow rate on local hydrodynamics and turbulence parameters. Results show a higher degree of mixing and enhanced mass transfer in PSPCs.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Engineering, Chemical
Zhengzong Huang, Hongjie Yan, Liu Liu, Hao Gong, Ping Zhou
Summary: The Euler-Lagrange approach was used to simulate the gas-liquid reaction system in a rectangular bubble column, showing satisfactory agreement with experimental results. The study focused on the chemisorption process of CO2 in aqueous NaOH, achieving higher accuracy compared to existing literature. Additional improvements included consideration of auto-dissociation of water and accurate estimation of the mean Sauter diameter distribution curve.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Engineering, Chemical
Masroor Abro, Liang Yu, Guangren Yu, Xiaochun Chen, Abdul Basit Qazi
Summary: Bubble characteristics in pure IL [BMIM][BF4] and its binary mixtures with MEA and MeOH were compared for the first time, showing that binary mixtures had smaller mean bubble size, higher gas holdup, and interfacial area. MeOH had a more pronounced effect compared to MEA. Sparger pore size and temperature significantly influenced bubble properties in gas-pure IL.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Biotechnology & Applied Microbiology
Soren Bernauer, Mathias Schoepf, Philipp Eibl, Christian Witz, Johannes Khinast, Timo Hardiman
Summary: The study reveals that the pre-dispersion of air introduced by the bottom impeller plays a key role in enhancing gas retention efficiency of the upper impellers. A more homogeneous distribution of air bubbles in the upper compartments leads to higher compartment gas hold-up values, but fewer bubbles near the impellers.
BIOTECHNOLOGY AND BIOENGINEERING
(2021)
Article
Engineering, Chemical
Huan Zhang, Zegao Yin, Wanqing Chi, Wenming Zhang
Summary: In this study, a new solver coupling Eulerian-Eulerian-Lagrangian approach with population balance model (PBM) was developed in OpenFOAM to simulate gas-liquid-solid three-phase flows. The new solver included the effects of solid particles on gas-phase or liquid-phase holdups, calculated interphase forces separately, and successfully compared with experimental results.
Article
Engineering, Environmental
Chengxiang Li, Yizhou Cui, Linxiao Zhai, Xiaogang Shi, Shuyu Liu, Jinsen Gao, Xingying Lan
Summary: The applicability of drag models for gas-liquid two-phase flow of sub-millimeter bubbles was investigated using experimental data in this study. The bubble swarm effect and its influence on the calculation of drag coefficients were also investigated. An equation for the drag modification factors was proposed based on the experiments, and its accuracy and applicability were validated using CFD simulation. This study provides insights into the hydrodynamic characteristics of sub-millimeter bubbly flows and offers an accurate CFD method for further investigation.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Yuxue Wu, Hang Chen, Xingfu Song
Summary: This paper focuses on the microbubble size control of a swirl flow microbubble generator. The results show that the baffle can improve the bubble dispersion without extra energy loss, and the single helical baffle can generate tiny bubbles with a Sauter mean diameter of 0.36 mm at a liquid flow rate of 2000 L/h.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Engineering, Chemical
Saad N. Saleh, Shakir M. Ahmed, Dawood Al-mosuli, Shahzad Barghi
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2015)
Article
Engineering, Chemical
Saad N. Saleh, Shahzad Barghi
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2016)
Article
Engineering, Chemical
Maksym Skydanenko, Vsevolod Sklabinskyi, Saad Saleh, Shahzad Barghi
Proceedings Paper
Engineering, Manufacturing
Saad N. Saleh, Omer Saaed, Maksym Skydanenko
ADVANCES IN DESIGN, SIMULATION AND MANUFACTURING II
(2020)
Proceedings Paper
Engineering, Chemical
Maksym Skydanenko, Vsevolod Sklabinskyi, Saad Saleh
ADVANCES IN DESIGN, SIMULATION AND MANUFACTURING
(2019)
