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
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
Chemistry, Multidisciplinary
Farhad Salmanizade, Ahmad Ghazanfari Moghaddam, Ali Mohebbi
Summary: In this study, a Dorr-Oliver hydrocyclone was used to separate impurities from raw biodiesel, achieving a maximum separation rate of 90.76% after optimization using the Taguchi method and CFD modeling.
SEPARATION SCIENCE AND TECHNOLOGY
(2021)
Article
Thermodynamics
P. Katare, A. Krupan, A. Dewasthale, A. Datar, A. S. Dalkilic
Summary: This study focuses on the industrial application of hydrocyclones for fine filtration, designing a hydrocyclone for cleaning machine filtration system and analyzing its performance efficiency through computational fluid dynamics software. Results show increasing pressure from center to wall and initial increase then decrease in velocity inside the cyclone. The study concludes with an efficiency of 76.19% for the hydrocyclone.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Mechanics
Zhen-Guo Ge, Xing-Qi Luo, Jian-Jun Feng, Guo-Jun Zhu, Deng-Hui He, Guang-Kuan Wu
Summary: In this study, a multiobjective and multicondition optimization methodology for improving the gas-liquid flow performance of a mixed-flow pump based on the inverse design is proposed. Results show that optimizing the impeller blade load can significantly improve the comprehensive performance of mixed-flow pumps.
Article
Thermodynamics
Mingjie Jin, Yuntong Xu, Jiaying Chen, Xuan Wei, Guiyuan Yu, Min Feng, Wen Cao, Liejin Guo
Summary: A universal numerical model framework was developed to optimize microalgae cultivation conditions and provide guidance for large-scale cultivation. The growth curve and rate of microalgae were estimated with a small error margin. Additionally, some PBR improvements for enhancing mixing and illumination were suggested.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Engineering, Chemical
Saeed Ahmed, Aitazaz Hassan, Rehan Zubair, Shahid Rashid, Atta Ullah
Summary: This study proposes a design modification to prevent cavitation in an industrial multi-stage orifice. Computational fluid dynamics (CFD) analysis is used to simulate the orifice, and it was found that a multi-holed geometry with four holes arranged at alternate positions on each orifice plate performs the best without any cavitation effects under the same operating conditions.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2023)
Article
Energy & Fuels
Yu-long Chang, Wang-qiang Ti, Hua-lin Wang, Shou-wei Zhou, Yuan Huang, Jian-ping Li, Guo-rong Wang, Qiang Fu, Hai-tao Lin, Ji-wei Wu
Summary: This study aims to improve the performance of a hydrocyclone suitable for subsea gas hydrate extraction by studying the effects of operating and geometric parameters through experiments and computational fluid dynamics (CFD) method. Results show that the optimal flow rate is 7 m(3)/h, and separation efficiency decreases while pressure drop increases as the solid content of the inlet increases.
Article
Energy & Fuels
Cindy Dianita, Ratchanon Piemjaiswang, Benjapon Chalermsinsuwan
Summary: The application of core annular flow (CAF) in transporting heavy oil through pipelines has shown potential in reducing energy consumption and improving cost efficiency. However, the presence of hydraulic fittings and the instability of CAF pose challenges. This study investigated the energy-saving potential of CAF in a horizontal T-pipe with symmetrical flow and proposed a strategy for maintaining CAF during oil transportation. The results showed significant energy reduction and pressure drop with CAF compared to traditional single phase oil flow. The modified T-pipe with additional water injection improved the stability of CAF and further reduced pressure drop and power consumption.
Article
Engineering, Chemical
E. Dianyu, Haihan Fan, Zhongfang Su, Guangtai Xu, Ruiping Zou, Aibing Yu, Shibo Kuang
Summary: This paper proposes a hydrocyclone with a tapered inlet design to reduce the influence of particles misplacement. The new hydrocyclone integrates the advantages of both spiral inlet and tangential inlet. Through the analysis of separation performance, flow characteristics, and volume fraction distributions, an optimum design is identified. Compared to a standard hydrocyclone, the new design significantly improves tangential velocities, expands the locus of zero vertical velocity, and achieves more stable air core, symmetric radial and axial velocity distributions, as well as reduced eddy flow and short-circuit flow. This study offers a new perspective for improving hydrocyclone flows and performance.
Article
Engineering, Chemical
Xin Zhang, Junjie Liu, Haokun Wu
Summary: In this study, the computational fluid dynamics (CFD) method was used to simulate the initial performance of glass-fiber (GF) filter media based on a random 3-D fiber model. By dividing the filter media into multiple independent zones and generating a fiber structure with the same fiber diameter distribution, the stability of the model and the effects of parameters on the filtration performance were investigated. The simulated pressure drop and efficiency of the most penetrating particle size (MPPS) were in good agreement with experimental values, and a comparison of different fiber diameter distributions was also conducted.
Article
Engineering, Chemical
Siyuan Sun, Kun Bo, Rui Jia, Pinlu Cao, Baoyi Chen, Mingyi Guo
Summary: Hole cleaning is crucial for reducing accidents and improving efficiency in reverse circulation (RC) down-the-hole hammer (DTH) drilling. A novel experimental device was used to study the physics of multiphase flow associated with the cleaning process, and the computational fluid dynamic (CFD) method simulated and analyzed multiphase flow behavior. The results reveal that factors such as Rate of Penetration (ROP), cuttings diameter, and water yield significantly impact the minimum air influx required for cuttings transport.
ADVANCED POWDER TECHNOLOGY
(2023)
Article
Energy & Fuels
Bruce E. Ciccotosto, Caleb S. Brooks
Summary: This study investigates the reversal deformation of the liquid interface in a pool with isothermal sidewalls by changing the top boundary condition, the liquid equation of state, and the gravity level. The differences in each scenario could lead to significant errors in analyzing the practical application of Marangoni flows.
Article
Engineering, Environmental
Narendra Khatri, Mandeep Singh, Sumit Pokhriyal, Eldon R. Rene
Summary: This paper presents a computational fluid dynamics (CFD) study on the classification of primary sludge using a Rietema type hydrocyclone in an activated sludge process (ASP) based wastewater treatment plant. The CFD simulation was performed to study various parameters and validate the experimental results. The installation of the hydrocyclone for primary sludge classification resulted in energy savings of 3194 kWh/year for wastewater treatment.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Duanxu Hou, Baoyu Cui, Qiang Zhao, Dezhou Wei, Zhenguo Song, Yuqing Feng
Summary: This paper investigates the flow field characteristics and separation performance of cylindrical hydrocyclones with different spigot upper diameters using the TFM model. The study finds that the spigot upper diameter significantly impacts the separation efficiency, with both undersize and oversize diameters leading to particle misplacement and negative classification performance.
Article
Energy & Fuels
Veera Asha Kumari Aketi, Vakamalla Teja Reddy, Narasimha Mangadoddy, G. E. Sreedhar, Shiva Kumar Raparla, Rajan Kumar
Summary: The presence of near-gravity material (NGM) significantly affects the washing of coal, leading to a misplacement of particles and reduced separation efficiency. The study focused on different sizes of NGM coal particles in a 350 mm DMC, revealing that particle size and density impact residence times and misplacement during the washing process.
INTERNATIONAL JOURNAL OF COAL PREPARATION AND UTILIZATION
(2021)
Article
Engineering, Chemical
Mandakini Padhi, Mayank Kumar, Narasimha Mangadoddy
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2020)
Article
Engineering, Chemical
Mona Mary Varghese, Teja Reddy Vakamalla, Bhargav Mantravadi, Narasimha Mangadoddy
Summary: Different drag models were used to predict bubbling and turbulent fluidized-bed characteristics, showing close agreement with experimental results in terms of bubble shape and pressure drop, but overestimating pressure drop at low gas velocities.
CHEMICAL ENGINEERING & TECHNOLOGY
(2021)
Article
Engineering, Chemical
Teja Reddy Vakamalla, Narasimha Mangadoddy
Summary: Hydrocyclone separators in mineral processing industries are often operated at high feed solids content, presenting challenges for accurate prediction using current CFD models. A dense slurry CFD model with ASM correction is used to simulate fluid-particle and particle-particle interactions, with fine particle-corrected viscosity modeling. The model shows accurate performance predictions in smaller hydrocyclones, with slight deviations observed at higher solids content and successfully predicting roping phenomena in a larger hydrocyclone.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Engineering, Chemical
Mona Mary Varghese, P. Aiswaria, Teja Reddy Vakamalla, Narasimha Mangadoddy
Summary: This study quantitatively measures the solid flow properties using an optical fiber probe in a lab-scale gas-solid fluidized bed. The influence of superficial gas velocities and static bed heights on particles of different size ranges are analyzed. The results showed that the solid holdup varied with the bed height and gas velocity, and there were differences in solid holdup between the center and the wall of the bed.
BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Environmental Sciences
Mandakini Padhi, Teja Reddy Vakamalla, Narasimha Mangadoddy
Summary: This study focuses on experimentally analyzing the iron ore slime beneficiation using a novel hydrocyclone design, which shows excellent performance in separating iron, alumina, and silica components effectively.
Article
Electrochemistry
Stephy Jose, Sudev Das, Teja Reddy Vakamalla, Dipak Sen
Summary: This research has made significant progress in blood glucose monitoring for diabetic patients. By developing a non-enzymatic electrochemical sensor, non-invasive detection of glucose has been achieved. The electrode, which combines the features of molecularly imprinted polymers and high conductivity, increases selectivity towards glucose sensing.
SURFACE ENGINEERING AND APPLIED ELECTROCHEMISTRY
(2022)
Article
Engineering, Chemical
Venkata Charan Reddy Eppala, Mona Mary Varghese, Teja Reddy Vakamalla
Summary: In this study, the effect of non-spherical particle shape on the hydrodynamics of a rectangular gas-solid fluidized bed is numerically investigated using a coupled Computational Fluid Dynamics - Discrete Element Method approach. The accuracy of the model is validated by comparing the predicted results with experimental data. The results show a strong relationship between particle sphericity and fluidization behavior.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2023)
Article
Engineering, Mechanical
Mona Mary Varghese, Teja Reddy Vakamalla, Ravi Gujjula, Narasimha Mangadoddy
Summary: This study aims to predict the solids circulation rate in an in-house ICFB using an empirical model and an Artificial Neural Network (ANN) technique. The models were developed based on solid circulation rates measured at different operating and design conditions using a high-speed video camera. The ANN model, with four input variables, showed close solid circulation rate prediction compared to experimental data, outperforming the empirical model in terms of accuracy.
FLOW MEASUREMENT AND INSTRUMENTATION
(2022)
Article
Engineering, Chemical
Stephy Jose, Sudev Das, C. Beula, Teja Reddy Vakamalla, Dipak Sen
Summary: A non-enzymatic electrochemical sensor was developed for glucose detection by combining molecularly imprinted polymer, polyaniline, and hierarchical dendritic structures. The electrodeposition parameters were optimized using Minitab 19.1 software, and the electrooxidation mechanism of glucose on the electrode surface was proposed. The fabricated electrode showed sensitivity towards millimolar amounts of glucose and higher selectivity in the presence of interfering species.
CHEMICAL ENGINEERING & TECHNOLOGY
(2023)
Article
Thermodynamics
Y. Vijrumbana, Anand Shankar Singh, Teja Reddy Vakamalla, V. Mahendra Reddy
Summary: This study investigates the effect of post-flame chemistry, combustion pressure, reactant-mixing, and secondary air supply on NOx emissions from NH3/CH4 swirl flame. The NH3/CH4 reaction model and a chemical reactor network are used to predict the NOx formation chemistry in NH3/CH4-air combustion. The study suggests that providing a post-flame zone can reduce both NOx and NH3 emissions, especially for rich NH3/CH4 flames.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2023)
Review
Mining & Mineral Processing
Narasimha Mangadoddy, Teja Reddy Vakamalla, Mayank Kumar, Aubrey Mainza
MINERAL PROCESSING AND EXTRACTIVE METALLURGY-TRANSACTIONS OF THE INSTITUTIONS OF MINING AND METALLURGY
(2020)
Article
Engineering, Chemical
Yunfei Yu, Xue Yang, Chenchen Zhang, Jie Chen, Wei Lin, Jianqiang Meng
Summary: This study reports an environmentally friendly and simple approach for preparing double-network (DN) ion gel membranes with high strength and excellent gas separation performance. By optimizing crosslinking density, mass ratio, and the type and content of free ionic liquid, the mechanical and gas separation properties of the DN membrane are improved.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Si-qi Jiang, Qiang Gao, Xi-guang Li, Chao-zhu Deng, Jun Qiu, Xiang-nan Zhu
Summary: A dual-strengthening pretreatment method is proposed to remove PVDF more efficiently and enhance the leaching of LiCoO2. Experimental results show that dual-strengthening pretreatment can effectively remove PVDF and significantly improve the leaching efficiency compared to single pretreatment methods.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Zengchi Hu, Xiaoyu Wang, Xiaohui Zhang, Xue Li, Jiangbin Xia
Summary: The rapid fabrication of high-performance composite membranes based on CMPs using simple and low-cost methods is challenging. In this study, three CMPs-based composite membranes were rapidly fabricated with adjustable size using unidirectional diffusion synthesis. The microstructural design enhanced the rejection rates of the membranes and they showed strong hydrolytic resistance, thermal stability, and acid-base resistance. Electrostatic adsorption and the adjustable microstructures significantly varied the repellence of the membranes to different charged molecules.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Farzaneh Rouhani, Matineh Ayedi, Nasser Safari
Summary: Introducing defects into porous metal-organic frameworks is important for improving their adsorption performance. Quasi-MOFs, an underutilized variant of large-scale, fundamentally deficient MOFs, have been found to have substantial amounts of unsaturated metal sites to offset the drawbacks of MOFs. In this study, a quasi-MOF was produced using a water-stable MOF and demonstrated significantly improved phosphate adsorption capability due to the presence of defect sites.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Valentin Reungoat, Morad Chadni, Louis M. M. Mouterde, Fanny Brunissen, Florent Allais, Helene Ducatel, Irina Ioannou
Summary: This study focuses on the recovery of sinapic acid using liquid-liquid extraction assisted by a hollow fiber membrane contactor from an aqueous feed obtained through the hydrolysis of mustard bran. The screening of solvents of different chemical nature showed that all tested solvents had an extraction efficiency of more than 80% for pH < 5. Four solvents were selected for use in the hollow fiber membrane contactor, and the volatile solvents showed higher mass transfer coefficients compared to non-volatile solvents. The extraction efficiency was intensified by increasing the initial concentration of sinapic acid and the feed-to-solvent ratio. CPME was found to have optimal recovery efficiency at a phase ratio of 8:1, yielding 0.9 g of sinapic acid per liter of CPME used.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Takahiro Sakamoto, Takafumi Hanada, Hayate Sato, Mayu Kamisono, Masahiro Goto
Summary: The emergence of the battery society has led to a high demand for battery metals, resulting in a strain on their supply. This study introduces a novel technique using a hydrophobic deep eutectic solvent (DES) for leaching and recovering battery metals from low-grade nickel laterite ores. The DES enables selective leaching and recovery of the metals, offering a promising pathway for the extraction of critical battery metals.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Rongrong He, Jiarui Chen, Chunyao Zhang, Dan Lu, Lin Zhang, Tao He
Summary: Researcher has developed a method to quantify the charge density in nanofiltration (NF) membrane separation layer and applied it in NF membranes that can separate Mg2+ and Li+. The results showed that overcompensated amine groups played a major role, and there was a linear relationship between charge density and coating bi-layers or PAH layers.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Zhijian Zhang, Min Chen, Zhe Lin, Zhichao Yang, Yafeng Du, Zhihui Chen, Zhenhao Yang, Kongyin Zhao, Ligang Lin
Summary: Membrane technology plays an important role in molecular/ion separation processes, but faces challenges such as membrane fouling. This study introduces a new ion-crosslinking method to fabricate copper alginate hydrogel membranes with improved mechanical strength and antimicrobial capabilities. The membranes exhibit excellent separation performance and enhanced long-term molecule/ion separation through improved anti-swelling properties. Molecular dynamics simulations and life cycle analysis highlight the pore structure and environmental friendliness of the hydrogel membranes. These findings provide valuable insights for developing sustainable hydrogel membranes with stable performance and high separation efficiency.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Dongmei Liu, Aiying Guo, Yanling Qi, Zhixin Ji, Hongjuan Li, Zhiwei Zhang, Xinyue Zhang, Kunze Wu, Aijun Cai
Summary: In this study, a stable magnetic Mg/Mn-layered double oxide-doped biochar composite (MgMnLDO-MBC) was prepared and successfully used for the removal of antibiotics and bacteria from wastewater. The composite exhibited enhanced surface areas, adsorption sites, and free radicals, leading to improved catalytic activity. The effects of different factors on the removal efficiency were evaluated, and the composite showed good reusability.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Feng Wang, Zhaoyong Bian, Yaru Zhang, Wenchao Yu, Qiang Zhang, Hui Wang
Summary: In this study, a nanofibrous layered structure of Ff-Ti3C2Tx-Co3O4 was prepared by self-assembling nanofibrous Co3O4 with lamellar fluorine-free MXene (Ff-Ti3C2Tx). The Ff-Ti3C2Tx-Co3O4 exhibited excellent catalytic activity for degradation, resistant to ionic interference, and maintained high removal efficiency of sulfamethoxazole (SMX) in municipal wastewater. The rapid SMX degradation involved fast electron transfer in redox cycles with PMS and the generation of 1O2 via PMS ->center dot O2 -> 1O2. This work provides new insights into antibiotic degradation mechanisms and electron transfer based on PMS activation.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Weipeng He, Jiacheng Luo, Yujie Wu, Tianhao Luo, Chen Tang
Summary: This study comparatively evaluated the role of cationic, anionic, and nonionic polyacrylamides (PAMs) in ballasted flocculation of clay suspensions under different aluminum sulfate (AS) coagulant dosages. The selection of PAMs and AS dosage had a significant influence on the size and shear resistance of ballasted floc aggregates.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Lixian Wang, Lizhi Zhao, Didi Si, Zhixin Li, Huiqin An, Hui Ye, Qingping Xin, Hong Li, Yuzhong Zhang
Summary: Metalloporphyrin-based nanozymes integrated with poly (vinylidene fluoride) membrane show high catalytic activity and reusability for the decolorization of Congo Red dye in continuous flow process.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Yongfei Ma, Chenyu Zeng, Yongzhen Ding, Jiayi Tang, Ondrej Masek, Zhikang Deng, Rui Mu, Zulin Zhang
Summary: In this study, sludge-derived biochar (SBC) was functionalized with various iron salts to enhance its adsorption ability for sulfamethoxazole (SMX) and magnetic collection performance. Ball milling was further employed to treat the optimal iron salt functionalized SBC (MSBC), resulting in ball milled SBC (BMSBC) with improved adsorption performance for SMX. The dominant driving mechanism for SMX adsorption onto BMSBC was confirmed to be multiple physicochemical forces, including 7C-7C conjugation, pore filling, H-bonding, Fe-O complexation, and electrostatic interactions. BMSBC exhibited favorable adsorption ability for SMX in actual waters and could be easily collected within 1 min due to its magnetic sensitivity.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Jinglin Tan, Xiaohui Mao, Wenjihao Hu, Hongbo Zeng
Summary: This study investigates the influence of PDMS chain architectures on surface properties and reveals that PDMS coatings with looped structures exhibit superior hydrophobicity, self-cleaning, and water sliding compared to coatings with linear structures. Additionally, both looped and linear PDMS coated stainless steel mesh/polyester fibers show efficient separation of oil/water mixture.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Wei-Liang Chen, Chih-Chia Cheng, Chien-Hsing Lu, Jem-Kun Chen
Summary: This study designs a novel sandwich-structured capacitor that reduces the absorption time of pollutants using dielectrophoresis force. By coating graphene oxide on polystyrene microspheres as adsorbents and encapsulating them within the capacitor, the adsorption rate is significantly enhanced. Additionally, frequency manipulation allows for the recycling of adsorbents and concentration of dyes, minimizing secondary pollution.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)