Article
Thermodynamics
K. A. Busov
Summary: An experimental investigation was conducted to study the dynamics of boiling-up of a jet of superheated water discharged from a high-pressure chamber through a short semi-cylindrical nozzle. The study reveals the changes in jet shape and the corresponding temperature range. The droplet size of the boiling-up jet is determined using a microscopic method. Additionally, a correlation between the particle mean diameter and pressure variations in the superheated liquid on the liquid-vapor phase equilibrium line is obtained.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Nuclear Science & Technology
Ju Hyun Park, Yong Hoon Jeong
Summary: The paper proposes a mechanism for droplet size variation and a method to determine the Sauter mean diameter, and validates the proposed model using RBHT data. The model is found to accurately predict the Sauter mean diameter of droplets and cladding temperatures of RBHT.
NUCLEAR ENGINEERING AND DESIGN
(2022)
Article
Geochemistry & Geophysics
Luis Vinnett, Ivan Cornejo, Juan Yianatos, Claudio Acuna, Benjamin Urriola, Camila Guajardo, Alex Esteban
Summary: This paper investigates the correlation between different macroscopic features of image regions and bubble size Sauter diameter (D-32) in flotation. By analyzing image properties under experimental conditions, a multivariable model was established with four predictors to accurately predict the Sauter diameter. The model was validated with 72 independent datasets, demonstrating its generalizability in laboratory-scale flotation for D-32 values ranging from 1.3 to 6.7 mm.
Article
Engineering, Electrical & Electronic
Antoni Brentjes, Bart Jansen, Artur K. Pozarlik
Summary: The spray characteristics of an air-assisted electrostatic atomizer were experimentally investigated using a shadowgraphy particle/droplet image analysis technique. The results showed that the droplet sizes followed the Rosin-Rammler distribution and the electrode voltage had no measurable impact on the droplet size and velocity. The energy efficiency of the sprayer was found to decrease with increases in both liquid and airflow.
JOURNAL OF ELECTROSTATICS
(2022)
Article
Chemistry, Multidisciplinary
Dominic Wirz, Anne Friebel, Kevin Rave, Mario Hermes, Romuald Skoda, Erik von Harbou, Hans-Joerg Bart
Summary: This study utilized an image-based telecentric probe to investigate steady-state droplet size distributions in a stirred vessel with a Rushton turbine impeller, and high-resolution droplet size distributions were extracted using a convolutional neural network. In addition, Sauter mean diameters were calculated and correlated with two semi-empirical approaches, while the correlated exponent in the Weber number was fitted to the experimental data in order to better represent the low coalescence tendency of the system.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Environmental
Jian Ruan, Hang Zhou, Zhiming Ding, Yaheng Zhang, Luhaibo Zhao, Jie Zhang, Zhiyong Tang
Summary: We proposed a machine learning (ML)-aided approach to predict the characteristics of microbubbles generated by venturi tube. The MLP, random forest, and Catboost models were trained to correlate the Sauter mean diameter (ds) with five operating features. All three ML models provided excellent predictability, with Catboost displaying the best extrapolation performance. Throat size and Reg were found to have the greatest and least influence on ds, respectively. This work demonstrates the potential of ML in gas-liquid multiphase flow.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Jeil Park, Wooyoul Ahan, Jae W. Lee
Summary: This study examined the impact of multiple impeller designs on droplet size and uniformity, with findings indicating that increasing impeller diameter was most effective in reducing the Sauter mean diameter. Additionally, droplet size varied with changes in impeller position.
KOREAN JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Engineering, Chemical
Woo Chang Sung, Jun Young Kim, Seok Woo Chung, Dong Hyun Lee
Summary: The study analyzed the effect of particle size distribution on the hydrodynamics of dilute-phase pneumatic conveying system using computational particle fluid dynamics simulation. Results showed that the pressure drop per unit length and saltation velocity decreased as the fine powder fraction in the particle size distribution increased.
ADVANCED POWDER TECHNOLOGY
(2021)
Article
Thermodynamics
Nikhil Sharma, Avinash Kumar Agarwal
Summary: Renewable fuels are being continuously optimized for automotive use to reduce reliance on conventional fossil fuels. This study focuses on exploring the microscopic spray characteristics of ethanol and methanol blended gasoline in direct injection Spark Ignition (DISI) engines. The results from this study are valuable for the automotive and fuel industries, as well as the spray community.
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2022)
Article
Soil Science
Mingyu Su, Chongxuan Liu, Lian-Ping Wang, Wenjuan Zheng
Summary: In this study, an alternative modelling framework to estimate the saturated hydraulic conductivity (K-sat) of soil was proposed. The framework uses the void ratio and arithmetic mean diameter to estimate K-sat. The results showed that the Sauter mean diameter performed better than other diameter indicators and PTF-based models. This study provides guidance for future empirical relationships between soil water retention curves, other soil properties, and continuous particle size distribution functions.
EUROPEAN JOURNAL OF SOIL SCIENCE
(2022)
Article
Chemistry, Applied
Hao Wu, Fujun Zhang, Zhenyu Zhang, Kun Wu, Xuejun Fan
Summary: This study measured the droplet size and velocity of an intermittent air-assisted n-octane spray using a Phase Doppler Particle Analyzer. The results showed that the droplet diameter range is generally independent of air injection duration and sampling time, while droplet velocity is correlated with these two parameters. The study also found that the local gas flow turbulence intensity has a significant radial sampling position dependence.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Engineering, Chemical
Lisha Dong, Liguang Wang
Summary: This paper investigates the gas dispersion in a laboratory scale bubble column with different electrolyte solutions and varying ionic strengths and air flow rates. It is found that oscillatory air supply at a certain frequency and amplitude can improve gas dispersion compared to steady air supply, with the degree of improvement varying depending on the electrolyte type and concentration and air flow rate. Additionally, a cooperative effect of electrolyte addition and oscillatory air supply on gas dispersion is observed, with a significant decrease in the bubble size.
MINERALS ENGINEERING
(2023)
Article
Nuclear Science & Technology
Khalid Khasawneh, Taeho Kim, Byeonggeon Bae, Jae Jun Jeong, Byongjo Yun
Summary: A new model for predicting droplet size in horizontal pipes under stratified and annular flow conditions was developed and validated using experimental data. The model takes into account the effects of gas velocity, liquid velocity, pipe diameter, and developing length on droplet size prediction accuracy.
NUCLEAR ENGINEERING AND DESIGN
(2021)
Article
Energy & Fuels
Marek Ochowiak, Andzelika Krupinska, Sylwia Wlodarczak, Magdalena Matuszak, Szymon Woziwodzki, Tomasz Szulc
Summary: This study focused on the distribution of droplet diameters and mean diameters produced by a commercial fogger, mainly in the range of 30-40 µm. A ceramic filter allowed for more smaller droplets and limited the number of larger droplets, which is important in reaching hard-to-access areas where battery-operated devices can be used to fight against the virus.
Article
Energy & Fuels
Sergejus Lebedevas, Oleh Klyus, Laurencas Raslavicius, Pawel Krause, Paulius Rapalis
Summary: The ability to manage the breakup of droplets and liquid jet atomization in diesel engines is a crucial challenge for unmodified CI engines. A comparative analysis of microalgae oil (MAO100) was conducted to enhance injection and liquid jet breakup characteristics at an elevated temperature. The results revealed distinct zones of intense droplet breakup, independent of fuel type and temperature. Preheated MAO100 exhibited smaller droplet sizes compared to room temperature, suggesting a controlled combustion process through preheating.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Engineering, Chemical
Jan Drzymala, Patrycja Bednarek-Gsbka, Przemyslaw B. Kowalczuk
Article
Geochemistry & Geophysics
Jan Zawala, Agata Wiertel-Pochopien, Przemyslaw B. Kowalczuk
Article
Metallurgy & Metallurgical Engineering
Vanderson Eney de Matos, Stephania da Consolacao Silva Nogueira, Gilberto Silva, Przemyslaw B. Kowalczuk, Antonio Eduardo Clark Peres
Summary: The investigation showed significant differences in foam stability between etherdiamine and ethermonoamine, with etherdiamine producing more stable and drier foams while ethermonoamine forming smaller bubbles with faster kinetics. These differences in foam properties affect the selectivity of reverse cationic flotation of iron ores, with water and solids recovery rates showing a significant impact on froth properties.
MINERAL PROCESSING AND EXTRACTIVE METALLURGY REVIEW
(2022)
Article
Metallurgy & Metallurgical Engineering
Vanderson Eney de Matos, Stephania da Consolacao Silva Nogueira, Przemyslaw B. Kowalczuk, Gilberto Rodrigues da Silva, Antonio Eduardo Clark Peres
Summary: This study investigated the impact of different types of Etheramines on flotation selectivity, focusing on their frothing properties. It found that Etherdiamine showed greater activity at the liquid-air interface, producing drier, voluminous, and more stable foams with longer lifetime, while Ethermonoamine exhibited faster foamability and greater water recovery in foam above critical coalescence concentration values.
MINERAL PROCESSING AND EXTRACTIVE METALLURGY REVIEW
(2022)
Review
Chemistry, Physical
Zhiyong Gao, Cong Wang, Wei Sun, Yuesheng Gao, Przemyslaw B. Kowalczuk
Summary: Fluorite, as a scarce nonrenewable strategic non-metallic mineral resource, is crucial in various fields and its demand continues to grow. This review provides insight into the crystal structure, common reagents in fluorite flotation, and the synergistic effect of collectors and depressants. It also summarizes widely seen fluorite-flotation cases for separation from other minerals, offering new understanding and potential guidance for similar mineral flotation.
ADVANCES IN COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Physical
Agata Wiertel-Pochopien, Piotr Batys, Jan Zawala, Przemyslaw B. Kowalczuk
Summary: Cationic alkyltrimethylammonium bromides and their mixtures with n-octanol were studied for their synergistic effects on foamability and floatability of quartz in the presence of binary mixtures of ionic/nonionic surfactants. Experimental results showed significant enhancement in foam height and recovery of quartz in mixed solutions. Molecular dynamics simulations supported the proposed mechanism for synergism, with preadsorption of n-octanol molecules causing increased C(n)TAB adsorption coverage in the two-phase system.
JOURNAL OF PHYSICAL CHEMISTRY B
(2021)
Article
Metallurgy & Metallurgical Engineering
Hamid Khoshdast, Ahmad Hassanzadeh, Przemyslaw B. Kowalczuk, Saeed Farrokhpay
Summary: This paper categorizes commonly used frothers and evaluates methods to determine their properties. The results suggest a need for developing novel experimental methods to accurately determine frother properties. Furthermore, the interactions between different frother properties and their impact on flotation performance need to be further investigated.
MINERAL PROCESSING AND EXTRACTIVE METALLURGY REVIEW
(2023)
Article
Geochemistry & Geophysics
Katarzyna Ochromowicz, Kurt Aasly, Przemyslaw B. Kowalczuk
Summary: This study discusses the current status of development of polymetallic manganese nodules, cobalt-rich manganese crusts, and seafloor massive sulfides, and summarizes the common methods for metal extraction from marine mineral deposits.
Review
Geochemistry & Geophysics
Sabereh Nazari, Ahmad Hassanzadeh, Yaqun He, Hamid Khoshdast, Przemyslaw B. Kowalczuk
Summary: This paper reviews recent developments in the understanding and application of ultrafine bubbles in flotation, focusing on the generation and detection methods as well as the types of reagents used. The limitations and opportunities of detecting ultrafine bubbles are comprehensively reviewed. The effectiveness of flotation-assisted nano-bubbles for mineral recovery is highlighted, but the accurate measurement of their size distribution and commonly used reagents remains a challenge. The study also identifies the most predominant methods for generating and detecting ultrafine bubbles and suggests future directions for research.
Article
Materials Science, Multidisciplinary
Sabereh Nazari, Shaoqi Zhou, Ahmad Hassanzadeh, Jinlong Li, Yaqun He, Xiangning Bu, Przemyslaw B. Kowalczuk
Summary: This study aims to investigate the application of nanobubbles in the flotation process of lithium-ion battery graphite. The effect of key operating parameters on the recovery of graphite was studied by adjusting the NB solution ratio, impeller speed, air flow rate, as well as dosage and type of collector and frother. The presence of nanobubbles was found to increase the flotation recovery and kinetic rate of lithium-ion battery graphite.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Ahmad Hassanzadeh, Manish K. Kar, Jafar Safarian, Przemyslaw B. Kowalczuk
Summary: This study investigates the properties of H-2-reduced calcium-added bauxite residue and the feasibility of iron recovery through electrostatic and magnetic separation methods. The self-hardened pellets are prepared and reduced, and their properties are analyzed using various techniques. The results show that the conversion of iron oxide in the bauxite residue to metallic iron is successful. However, the electrostatic technique is found to be inefficient, while the Davis Tube and low-intensity magnetic separation methods show reasonable improvement in the Fe content with acceptable recoveries. Further suggestions are provided for the physical beneficiation of the studied bauxite residue.
Article
Geochemistry & Geophysics
Ahmad Hassanzadeh, Ganesh Pilla, Manish K. Kar, Przemyslaw B. Kowalczuk
Summary: This study focuses on reducing and separating iron from Greek bauxite residue (BR) using hydrogen and magnetic separation processes. It was found that converting iron oxides and ferric oxyhydroxide into magnetite, and aluminum (oxy)hydroxides into sodium aluminates is feasible. However, the dissemination of iron throughout the sample matrix poses a challenge in physical separation processes.
Review
Geochemistry & Geophysics
Dominik Kosior, Agata Wiertel-Pochopien, Przemyslaw B. Kowalczuk, Jan Zawala
Summary: This narrative review focuses on the motion of bubbles in flotation process, discussing their behavior and shape deformation in different systems. Monitoring bubble motion provides valuable information about the state of the gas-liquid interface.
Review
Engineering, Environmental
Gaogui Jing, Xiangsong Meng, Wei Sun, Przemyslaw Boguslaw Kowalczuk, Zhiyong Gao
Summary: Mineral processing wastewater (MPW) is a significant industrial source of pollution and requires proper treatment to achieve standard discharge or recycling. This study analyzes the sources and restrictions on MPW contaminants and reviews current techniques for treatment and recycling. While physicochemical treatments have limited efficiency, biological treatments have shown effectiveness in degrading flotation reagents. Advanced oxidation processes (AOPs) are promising candidates for MPW treatment, but their full-scale application in the industry is still limited. It is a challenge for mineral processing plants to choose appropriate approaches for wastewater recycling. The review aims to improve understanding of MPW management, treatment, and recycling.
ENVIRONMENTAL SCIENCE-WATER RESEARCH & TECHNOLOGY
(2023)
Review
Engineering, Environmental
Gaogui Jing, Shuai Ren, Stephen Pooley, Wei Sun, Przemyslaw B. Kowalczuk, Zhiyong Gao
Summary: Electrocoagulation (EC) is a promising method for treating industrial effluent, offering advantages such as good effluent quality, compact installation, simple operation, and reduced sludge generation for treating various recalcitrant pollutants. The review thoroughly examines the characteristics, mechanism, applicability, and factors affecting the efficiency of EC, along with discussions on the management of EC sludge and the development of emerging hybrid technologies. The review emphasizes the applicability of EC in treating real industrial wastewaters and predicts it to be one of the core methods for industrial effluent treatment in the long term.
ENVIRONMENTAL SCIENCE-WATER RESEARCH & TECHNOLOGY
(2021)
