Article
Engineering, Chemical
Stefano Passoni, Igor Matteo Carraretto, Riccardo Mereu, Luigi Pietro Maria Colombo
Summary: This study focuses on the numerical prediction of pressure gradient and void fraction in gas-liquid stratified flow, and investigates the influence of grid discretization and turbulence model on the simulation accuracy. The results show that different turbulence models are required depending on the gas velocity and flow regime. Compared with one-dimensional models, CFD simulations are more accurate in predicting the pressure gradient at gas superficial velocities lower than 1.3 m/s.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2023)
Article
Thermodynamics
Yusi Tian, Yonggang Jiao, Fei Han, Zuo Cheng, Jian Li
Summary: In this paper, the structure of the interrupted microchannel is improved by numerical simulation, and the two-phase characteristics of the new microchannel are quantified using gas-liquid flow ratios, relative standard deviations, and pressure drop fluctuations. The simulation results show that the widening design of the two side branches offsets the effect of inertia force and balances the flow resistance in the downstream branches. The gas flow relative standard deviation of the interrupted microchannel is significantly lower than that of the traditional microchannel at high void fraction.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Engineering, Chemical
Mohammad Amin Moradkhani, Seyyed Hossein Hosseini, Mengjie Song
Summary: CO2 is widely used as a working fluid in heat exchangers due to its environmentally friendly nature. However, due to its unique thermophysical properties, specific models are needed to estimate its two-phase characteristics, particularly frictional pressure drop (FPD). This study presents intelligent FPD models based on a large dataset of experimental samples for CO2. The proposed models exhibit high accuracy and reliability across different conditions, channel sizes, and flow patterns.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2023)
Review
Thermodynamics
Khadije El Kadi, Fadi Alnaimat, S. A. Sherif
Summary: The paper provides a comprehensive review of condensation studies in microchannels conducted in the last two decades, including experimental investigations, theoretical predictive models, and computational predictions. It presents a wide range of operating conditions, channel geometries, heat transfer fluids, research methods, and advancements in condensation heat transfer in mini and microchannels.
APPLIED THERMAL ENGINEERING
(2021)
Article
Acoustics
Amol Gode, Ketan Madane, Vivek V. Ranade
Summary: The design parameters such as aspect ratio of the vortex chamber, number of tangential inlets, and shape of the device significantly influence the flow characteristics and cavitation in vortex-based hydrodynamic cavitation devices. Experimental validation of computational studies showed that an aspect ratio of six is optimal. The performance of devices with single and multiple inlets is comparable at the same pressure drop. Simplification of the device configuration for scale-up does not significantly affect cavitation performance.
ULTRASONICS SONOCHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Yongchao Rao, Zehui Liu, Shuli Wang, Lijun Li
Summary: This study investigates the impact of gas-liquid swirl flow on the gas-liquid contact area, heat and mass transfer efficiency, and gas hydrate formation, utilizing numerical simulations. The flow pattern map of gas-liquid swirl flow was compared with the Mandhane flow pattern map, predicting the flow boundary of swirl bubble flow and swirl annular flow.
Article
Chemistry, Multidisciplinary
Yongchao Rao, Shuli Wang, Lijun Li
Summary: This study conducted a numerical simulation to investigate the gas-liquid two-phase spiral annular flow pattern and its conversion law in a horizontal tube with twist tape by spiral on-way. It identified three main flow patterns and identified the main factor affecting the existence of the gas phase. Additionally, it discovered a new flow pattern compared to the local spiral flow pattern of the short twisted band.
Article
Engineering, Chemical
Shu Wang, Dong Hu, Fengling Yang, Peng Lin, Chuanlin Tang
Summary: This paper divides the airlift process into liquid-solid two-phase section and gas-liquid-solid three-phase section, establishing pressure drop models based on energy conservation and phase hold-up equations. The results show that pressure drop decreases rapidly first and then tends to be constant with the increase of pipe diameter, with different effects of air superficial velocity and immersion rate on pressure drop in two-phase and three-phase sections. Both measured and calculated pressure drop values are in good agreement, especially under specific conditions.
Article
Thermodynamics
J. A. Montanez-Barrera, J. M. Barroso-Maldonado, A. F. Bedoya-Santacruz, Adrian Mota-Babiloni
Summary: In this study, a new method called correlated-informed neural networks (CoINN) is proposed for predicting the pressure drop of zeotropic mixtures in micro-channels. The method improves the performance and generalization capabilities of artificial neural networks (ANNs) by transferring the knowledge of pressure drop correlation to the ANN.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Energy & Fuels
Jignesh Thaker, Sunny Saini, Jyotirmay Banerjee
Summary: This study focuses on the erosion-corrosion issues in piping systems caused by intermittent flow, proposing a unified correlation for prediction of two-phase frictional pressure drop in intermittent flow regime. The experimental results and obtained correlation will be crucial in preventing material degradation and leakages in pipelines, aiding effective and safe design in various industries such as petroleum, nuclear, geothermal, and chemical.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Chemistry, Analytical
Yuqi Zhang, Haoxian Wu, Ling Zhang, Yunbo Yang, Xiangdong Niu, Zerong Zeng, Bifen Shu
Summary: In this experiment, an investigation on pressure drop in two-phase flow using R-134a was conducted in microchannels with different surface wettability (superhydrophilic, hydrophilic, and common). The results showed that the hydrophilic surface modification effectively enhanced heat transfer and reduced friction pressure drop. Based on the flow patterns and pressure drop characteristics, a new parameter called the flow order degree was proposed to account for the overall effects of mass flux, vapor quality, and surface wettability on two-phase frictional pressure drop in microchannels, and a newly developed correlation based on the separated flow model was presented.
Article
Thermodynamics
Yuanzheng Lv, Guodong Xia, Lixin Cheng, Dandan Ma
Summary: Experiments were conducted in two parallel rectangular multi-microchannels using HFE-7100 for flow boiling, revealing significant differences in heat flux and pressure drop under different aspect ratios, with the minimum heat flux decreasing as the aspect ratio decreases. The physical mechanisms of unstable vapor liquid two phase phenomena were analyzed based on a simplified mathematical model, suggesting that a wide flat regime in the hydrodynamic curves may decrease such phenomena.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
Xenia Gabrisch, Jens-Uwe Repke
Summary: This paper investigates the two-phase propane flow through a copper capillary tube, focusing on the metastable flow and hysteresis effects. It introduces the concept of wetting ratio and incorporates the findings into a mathematical description, enhancing the ability to predict ambiguous data. The extended model successfully simulates the general trend of hysteresis effects and improves the overall data prediction.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2021)
Article
Engineering, Marine
Wenhua Li, Qing Zhou, Guang Yin, Muk Chen Ong, Gen Li, Fenghui Han
Summary: This study investigates the gas-liquid flow and induced vibration in a subsea jumper using experimental and numerical techniques. The experimental results show that the flow patterns and vibration amplitudes are highly related to the gas content rate, mixing velocity, and gas and liquid superficial velocity. The numerical simulations agree well with the experimental data in terms of flow patterns and induced vibrations.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Mechanics
Mehdi Mortazavi
Summary: This study investigated the liquid-gas two-phase flow across a flow channel bend in a PEM fuel cell and developed a new model to accurately predict pressure drop. The proposed two-phase flow pressure drop model and C correlation were able to predict the pressure drop with mean absolute error values.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2021)
Article
Energy & Fuels
Hosnie-Sadat Mousavi, Masoud Rahimi, Majid Mohadesi
Summary: This study investigated the purification of glycerol obtained from the biodiesel production process using various solvents. The results showed that petroleum ether was more effective in removing methanol from glycerol and purifying it compared to the other solvents.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Energy & Fuels
Amir Salarabadi, Masoud Rahimi
Article
Engineering, Chemical
Pourya Asgarifard, Masoud Rahimi, Navid Tafreshi
Summary: The study focused on CO(2) capture using ammonia aqueous solution in a T-shaped microchannel, with ammonia concentration being the most influential parameter followed by gas flow rate and temperature. Numerical optimization predicted the highest CO(2) capture efficiency under optimal conditions, with ammonia concentration having the greatest impact. This suggests that optimizing ammonia concentration is crucial for achieving higher CO(2) capture efficiency.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Biotechnology & Applied Microbiology
Sara Pourkarimi, Maryam Saberdel Sadeh, Ahmad Hallajisani, Mohsen Hajikhani, Maryam Moradi, Omid Alizadeh, Amideddin Nouralishahi
Summary: The study investigated the production of bio-oil from macroalgae biomass through catalytic pyrolysis. Experimental results showed that Ulva bio-oil had higher energy efficiency and better chemical properties compared to Azolla bio-oil under specific catalyst conditions. The results indicate the promising potential of bio-oil production from the pyrolysis of Azolla and Ulva biomass for industrial-scale applications.
BIOCHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Chemical
Rezvan Ghalavand, Masoud Mokhtary, Alireza Shakeri, Omid Alizadeh
Summary: The study demonstrated that ZnO@PMMA nanoparticles can improve the characteristics of the PSf membrane substrate, enhancing porosity, hydrophilicity, pure water permeability, and morphology. The FO performance of modified membranes was thoroughly evaluated in terms of water flux and reverse salt flux using a cross-flow system. Water permeability and salt rejection were measured using a dead-end RO setup.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2022)
Article
Physics, Atomic, Molecular & Chemical
R. Sayyadikord Abadi, A. Fallah Shojaei, F. Eslahi Tatafei, Omid Alizadeh
Summary: QSAR investigations of a series of 25 Octreotide drugs were performed using multiple linear regression (MLR) and artificial neural network (ANN) as modelling tools. The results showed that the ANN-GA scheme was the most effective. The activity of the drugs was found to be influenced by certain descriptors in the gas phase, and the copper complex was the most stable among the derivatives. The study also employed the Monte Carlo method to further analyze the derivatives and check the correlation coefficient and standard error of the model.
RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY B
(2022)
Review
Polymer Science
Hamed Hasanzadeh Kermani, Vahid Mottaghitalab, Masoud Mokhtary, Omid Alizadeh
Summary: The current research investigates the reinforcing effect of MWCNT and GO on EPDM and carboxylated butadiene rubbers. The addition of carboxylated rubbers and coupling agents increases the mechanical properties of EPDM, while the addition of graphene improves the rheological, mechanical, and thermal properties of the composites.
JOURNAL OF POLYMER RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Rezvan Ghalavand, Masoud Mokhtary, Alireza Shakeri, Omid Alizadeh
Summary: In this study, hydrophilic polyacrylamide (PAM)-grafted ZnO nanoparticles (ZnO-g-PAM NPs) were prepared and embedded into the polyamide (PA) rejection layer of a thin-film nanocomposite (TFN) membrane to improve the FO performance and perm-selectivity, and antifouling properties. The effect of ZnO-g-PAM concentration on the hydrophilicity, morphology, and roughness of PA thin layer and FO performance of the TFN membranes were investigated. The high hydrophilicity of ZnO-g-PAM nanofiller in the PA structure leads to the hydration layer formation on the ZnO-g-PAM-modified PA layer, which minimize the fouling tendency. Therefore, the present study is the first time to consider the implementation of ZnO-g-PAM onto TFN-FO membranes.
JOURNAL OF NANOPARTICLE RESEARCH
(2023)
Article
Water Resources
Alireza Baghizade, Farshad Farahbod, Omid Alizadeh
Summary: This study investigates the use of a biological treatment unit to treat outlet wastewater from a flocculation reactor. The wastewater has an unpleasant odor and the unit successfully separates biological contaminants. The results show that the optimum oxygen injection time is 35 minutes. Increasing the oxygenation time leads to a reduction in nitrate and phosphate levels by 67% and 60.8% respectively. BOD and COD decrease by about 1.8% and 1% respectively when the oxygenation time is increased from 35 to 40 minutes. Furthermore, increasing the oxygen injection time from 5 to 35 minutes reduces organic carbon and petroleum hydrocarbons levels from 20.1 to 4.8 mg/l and 0.14-0.4 mg/l respectively. The biological unit also decreases wastewater turbidity from 4.3 NTU to 2.1 NTU, with a pH range of 9.9 to 10.4.
APPLIED WATER SCIENCE
(2023)
Article
Engineering, Chemical
Mehdi Moghaddasi, Mostafa Keshavarz Moraveji, Omid Alizadeh
Summary: Flare gas recovery can reduce greenhouse gas emissions. Computational fluid dynamics (CFD) is used to optimize the performance of a two-phase ejector. By adjusting the geometrical parameters such as nozzle diameter, throat diameter and length, and converging and diverging angles, the gas flow can be increased significantly.
CHEMICAL ENGINEERING COMMUNICATIONS
(2023)
Article
Energy & Fuels
Esmaeil Darash, Mostafa Keshavarz Moraveji, Arezou Jafari, Arsalan Parvareh, Omid Alizadeh
Summary: Among the methods of chemical enhanced oil recovery, alkaline flooding shows potential for increasing oil recovery in reservoirs with acidic crude oil. This study investigated the impact of temperature on alkaline flooding using sodium hydroxide and sodium carbonate in homogeneous and heterogeneous micromodels. The results showed that at low temperatures, sodium hydroxide increased the pH, promoting emulsification and reducing interfacial tension to enhance oil recovery. However, at high temperatures, the reaction rate increased, weakening the effect of interfacial tension and hindering the formation of water droplets within the oil phase, leading to a decrease in oil recovery. The findings provide insights into the impact of temperature on mechanisms such as reducing interfacial tension and producing emulsion during alkaline flooding for heavy oil recovery.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2023)
Article
Green & Sustainable Science & Technology
Alireza Baghizade, Farshad Farahbod, Omid Alizadeh
Summary: Solar pond is a new technology used for freshwater production, and this research presents a mathematical model for estimating salt deposition in a studied solar pond. The results demonstrate the high accuracy of the proposed model, with a sum of square error of 3.048E-14 and a relative error of 0.11214. The significance of temperature and shear stress in salt deposition is validated, and the R-Squared value of the proposed model is 0.9359, indicating good validity.
ENVIRONMENT DEVELOPMENT AND SUSTAINABILITY
(2023)
Article
Education & Educational Research
Jalil Fathi, Masoud Rahimi
Summary: This study investigates the impact of flipped classroom on EFL students' writing performance and fluency. The results show that flipped classroom significantly improves students' overall writing performance and fluency.
COMPUTER ASSISTED LANGUAGE LEARNING
(2022)
Article
Environmental Sciences
S. Pourkarimi, A. Hallajisani, A. Alizadehdakhel, A. Nouralishahi
Summary: This study compared the characteristics of bio-oil produced from slow pyrolysis of Azolla filiculoides and Ulva fasciata, with Ulva fasciata bio-oil showing superior properties for application in diesel-based automotive industries. The energy recovery from Ulva fasciata pyrolysis was calculated to be 56.6%, which was significantly higher than that from Azolla filiculoides pyrolysis.
GLOBAL JOURNAL OF ENVIRONMENTAL SCIENCE AND MANAGEMENT-GJESM
(2021)
Article
Polymer Science
Hossein Asadi, Asghar Alizadehdakhel, Ali Ramazani, Fatereh Dorosti
Summary: The study aimed to investigate the performance of mixed matrix membranes composed of PSF and PES as polymers and Cu-BTC as filler. Results showed that the addition of nanoparticles and polymers enhanced the thermal and mechanical stability of the membranes, with good dispersion and interaction between the components. Gas permeability studies indicated a significant improvement in permeation and selectivity when Cu-BTC and PES were added to the PSF matrix. Overall, the synthesized membranes demonstrated optimized performance with improved permeability and selectivity.
