Article
Engineering, Chemical
Jenniffer Solange Ayala, Helder Lima de Moura, Rodrigo de Lima Amaral, Francisco de Assis Oliveira Junior, Jose Roberto Nunhez, Guilherme Jose de Castilho
Summary: This study evaluates the fluid characteristics of CMC aqueous solution using PIV measurements, demonstrating a strong influence of spatial resolution on shear rate, with the highest shear rates obtained in the impeller region.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Engineering, Chemical
Xiaofang Lv, Boyu Bai, Yi Zhao, Yang Liu, Qianli Ma, Chuanshuo Wang, Shidong Zhou, Shangfei Song, Bohui Shi
Summary: This paper focuses on the effects of water cut, polymerization inhibitor concentration, and temperature on the viscosity of natural gas hydrate slurry. It establishes a rheological model for the slurry and finds that water cut and polymerization inhibitor concentration increase the apparent viscosity, while temperature decreases it.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2022)
Article
Engineering, Chemical
Prakash Mishra, Farhad Ein-Mozaffari
Summary: The study analyzed the complex slurry suspension and dissemination behavior in a coaxial slurry mixing system, validated numerical models, and thoroughly analyzed the influence of various important parameters on slurry suspension characteristics. Evaluation of energy loss and the importance of optimum inner impeller clearance and diameter for achieving a high degree of solids suspension were conducted.
Article
Materials Science, Multidisciplinary
Cenk Yanen, Murat Yavuz Solmaz, Ercan Aydog, Hasan Arslanoglu
Summary: This study estimates the rheological models of shear thickening fluids (STFs) using a statistical method. Different sample sets with varying nanoparticle ratios, particle sizes, and molecular weight of the liquid mediums are used to produce STFs. The experimental data is modeled using non-Newtonian models, and Herschel-Bulkley is found to be the most suitable model for describing the rheological behavior.
MATERIALS CHEMISTRY AND PHYSICS
(2024)
Article
Engineering, Multidisciplinary
Michal Wrobel, Gennady Mishuris, Panos Papanastasiou
Summary: The study investigates the spatial and temporal evolution of fluid flow and resulting fracture geometry in a hydraulic fracture driven by a non-Newtonian shear-thinning fluid. The analysis demonstrates that rheological properties of fluids significantly impact the hydraulic fracturing process.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2021)
Article
Engineering, Mechanical
Satish C. Sharma, Anil Singh
Summary: Recent years have seen an increase in the use of porous bearings in industrial applications due to their noise reduction, precision, and low maintenance. The study focuses on the numerical analysis of a conical porous hybrid journal bearing system (CPHJBS) and investigates the effects of permeability parameter, semi cone angle, and pseudoplastic lubricant behavior on its performance. Findings suggest that using a pseudoplastic lubricant in CPHJBS can improve stability threshold speed margin under certain conditions.
TRIBOLOGY TRANSACTIONS
(2021)
Article
Mechanics
Kazuya Shimizu, Shu Takagi
Summary: An airlift pump facility of 200 m length was designed and constructed for pump experiments with water and two types of highly-viscous shear-thinning slurries. Experimental results showed the capability of the airlift pump for slurries, but discrepancies were observed between simulation and experimental results under high airflow rate conditions, highlighting the need for improvement in prediction accuracy under different viscosity conditions.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(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
Energy & Fuels
Juan Xiao, Simin Wang, Xudong Duan, Shupei Ye, Jian Wen, Zaoxiao Zhang
Summary: This study investigated the rheological properties of coal water slurry (CWS) at different concentrations and temperatures. The results showed that CWS is a pseudoplastic fluid that follows the Bingham model. The yield stress and Bingham plastic viscosity increase with increasing concentration and usually decrease with temperature. The concentration of CWS is positively correlated with the apparent viscosity, which decreases first and then increases with temperature. The research provided a new method for obtaining empirical models of non-Newtonian fluids.
INTERNATIONAL JOURNAL OF COAL PREPARATION AND UTILIZATION
(2022)
Article
Engineering, Manufacturing
Zipeng Guo, Fan Fei, Xuan Song, Chi Zhou
Summary: Direct ink writing (DIW) is a popular additive manufacturing technology for creating 3D objects using different materials. In this study, we analyze the non-Newtonian ink flow behavior during the DIW process using computational fluid dynamics (CFD) simulations. Different syringe-nozzle geometries are tested, and we reveal the shear-thinning property during ink extrusion. Based on our investigations, we propose an improved syringe-nozzle geometry for stable extrusion and high printing quality.
JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING-TRANSACTIONS OF THE ASME
(2023)
Article
Mathematics, Applied
Cholmin Sin
Summary: We prove that a weak solution for unsteady 3D shear thinning flows is strong under the certain assumption about the direction of the vorticity for 5 3 < p <= 2. As an auxiliary result, we show the short time existence of strong solution for whole space.
NONLINEAR ANALYSIS-REAL WORLD APPLICATIONS
(2023)
Article
Energy & Fuels
Mike Uche Ajieh, Nosakhare Andrew Amenaghawon, Kesiena Owebor, Oghenero Henry Orugba, Esua Bassey Bassey
Summary: Water-soluble polymers are used to improve drilling operations, but excessive utilization of these additives may have negative implications on drilling outcomes, increasing the equivalent circulating density may lead to formation damage.
PETROLEUM SCIENCE AND TECHNOLOGY
(2023)
Article
Polymer Science
Vladimir Neverov, Vladimir Shelukhin
Summary: The processing of experimental data on particle settling in shear-thinning polymer solutions has led to the development of a mathematical model consisting of two continua. The model, which is consistent with basic thermodynamics laws, includes a correlation formula for gravitational mobility. The model has been validated through comparison with experimental and analytical data. The study also provides an explanation for the Boycott effect and demonstrates that sedimentation is enhanced in a 2D inclined vessel.
Article
Instruments & Instrumentation
Anqi Li, Gang Yang, Chenhui Yao, Xue Yan, Dean Hu
Summary: This paper investigates the low-speed impact resistance of shear thickening fluid (STF) under finite space constraints through experiments and numerical models. The study reveals that geometric constraints have a significant influence on the impact resistance of STF.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Engineering, Chemical
Xiaohui Su, Zhifeng Xu, Zhiguo Wang, Hui Jin, Song Wu, Yinbin Lu
Summary: A drag force closure model is developed for particle-laden flows in viscoelastic fluids using the Giesekus rheological model. The model captures the effects of fluid rheological properties on the flow dynamics of a spherical particle in viscoelastic fluids. Direct numerical simulations show that the drag force of a sphere in unbounded Giesekus fluids decreases with increasing Deborah number, and a negative wake may occur when the viscosity ratio exceeds 0.6 in Giesekus fluids. An explicit closure model for the drag coefficient of a sphere in Giesekus fluids is established using artificial neural networks. The model provides a method for explicitly formulating the momentum exchange model for dilute suspensions of solid particles in shear-thinning viscoelastic fluids.
Article
Engineering, Chemical
C. A. O. Rocha, G. Ullmann, D. O. Silva, L. G. M. Vieira
Article
Green & Sustainable Science & Technology
Daiane Ribeiro Dias, Gregori Ullmann, Danylo de Oliveira Silva, Luiz Gustavo Martins Vieira
Summary: The study proposed and investigated a low-cost, sustainable air conditioning system utilizing warm, dry air and the psychrometric effect to achieve cooling. Numerical results showed that the system can provide significant temperature reduction in warm, dry conditions, with energy savings compared to conventional air conditioning systems.
ENVIRONMENTAL PROGRESS & SUSTAINABLE ENERGY
(2021)
Article
Chemistry, Applied
Henrique Coutinho de Barcelos Costa, Erica Sayuri Siguemoto, Tiago Augusto Bulhoes Bezerra Cavalcante, Danylo de Oliveira Silva, Luiz Gustavo Martins Vieira, Jorge Andrey Wilhelms Gut
Summary: Microwave heating is a promising technology for continuous flow thermal processing of fluid foods due to better quality retention. Inactivation kinetics of POD and PPO in acai-berry pulp varied under different heating technologies, with microwave showing specific effects on protein structure. Additionally, dielectric properties of acai-berry pulp changed with temperature at different frequencies.
Article
Engineering, Chemical
Fernanda Falqueto Salvador, Guilherme Guimaraes Ascendino, Erica Victor de Faria, Marcos Antonio de Souza Barrozo, Luiz Gustavo Martins Vieira
Summary: This study investigated the influence of geometric variables on the separation performance of a filtering cylindrical hydrocyclone (FCyH). The main difference observed between FCyH and conventional hydrocyclones was in the Euler number. An optimization study using the Differential Evolution Algorithm was carried out to find two categories of hydrocyclones, resulting in a hydrocyclone with total efficiency 8.1% higher than the equipment with the highest efficiency.
Article
Agricultural Engineering
Raissa Aparecida da Silveira Rossi, Janaina Miranda Barbosa, Marcos Antonio de Souza Barrozo, Luiz Gustavo Martins Vieira
Summary: This study explores the production of hydrogen and bio-oil from renewable sources, specifically using microalgae in catalytic pyrolysis under a hydrogen atmosphere. By combining alkaline electrolysis for hydrogen production with catalytic hydropyrolysis for bio-oil production, under optimal conditions a bio-oil yield of 48.83% with a hydrocarbon content of 37% was achieved.
BIOMASS & BIOENERGY
(2021)
Article
Thermodynamics
J. M. Barbosa, R. A. S. Rossi, L. A. Andrade, M. A. S. Barrozo, L. G. M. Vieira
Summary: The use of renewable energy sources in the pyrolysis process for bio-oil production, specifically with a Mg-Al mixed oxides catalyst derived from hydrotalcite, has shown promising results in improving the quality and content of bio-oil. The study also found that reusing the catalyst did not significantly impact the hydrocarbon content of bio-oil, with stable results observed after multiple pyrolysis cycles.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Green & Sustainable Science & Technology
Raissa Aparecida da Silveira Rossi, Janaina Miranda Barbosa, Marcos Antonio de Souza Barrozo, Luiz Gustavo Martins Vieira
Summary: The study investigates the production of bio-oil using solar assisted catalytic hydropyrolysis process. Results show that this technique can achieve higher liquid yields with lower content of oxygenated compounds. There are some differences in the effects of the two different processes, providing important insights for further research into this process.
Article
Engineering, Chemical
Erica Victor de Faria, Fernanda Falqueto Salvador, Guilherme Guimaraes Ascendino, Marcos Antonio de Souza Barrozo, Luiz Gustavo Martins Vieira
Summary: In this study, an optimization study was conducted on a filtering hydrocyclone using Differential Evolution algorithm to achieve thickening purposes with low energy consumption. The results showed significant improvements in the split ratio and Euler number for the optimized design of the filtering hydrocyclone.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2022)
Article
Engineering, Mechanical
Rodolfo Sapata Gonzalez, Raissa Aparecida da Silveira Rossi, Luiz Gustavo Martins Vieira
Summary: With the advancement of process industries, there has been an increase in process safety accidents in Brazil, which have caused significant damages to lives, properties, communities, the environment, and the economy. This study aims to quantify the economic and financial consequences of three different process safety accidents and highlights Brazil's vulnerability in terms of process safety control and product storage.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Engineering, Chemical
Henrique Coutinho de Barcelos Costa, Tiago Augusto Bulhoes Bezerra Cavalcante, Jorge Andrey Wilhelms Gut, Danylo de Oliveira Silva, Luiz Gustavo Martins Vieira
Summary: This study evaluated the thermal inactivation of peroxidase and polyphenol oxidase in acai-berry pulp during continuous pasteurization using plate heat exchangers (PHEs). Experimental treatments were simulated by CFD and numerical results were compared with experimental data, showing better performance in a series flow arrangement. However, reasonable deviations between numerical and experimental results were observed, especially in a series-parallel flow arrangement.
JOURNAL OF FOOD ENGINEERING
(2022)
Article
Biotechnology & Applied Microbiology
Paulo Siqueira Silva, Carlos Roberto Rodrigues Veloso, Marcos Antonio de Souza Barrozo, Luiz Gustavo Martins Vieira
Summary: The study focused on analyzing the impact of operating conditions on the drying process and quality of Spirulina platensis in an indirect solar dryer. Results showed that the thermal-fluid-dynamic conditions provided drying air temperatures from 34 to 42 degrees Celsius, with an average thermal efficiency of 62%, and adequate drying in up to 3.5 hours. Higher temperatures combined with lower mass loads resulted in increased levels of phycocyanin in dry microalgae by up to 43%.
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
(2021)
Article
Engineering, Chemical
Murilo Guimaraes Morimoto, Suelen Mara Goncalves, Marcos Antonio de Souza Barrozo, Luiz Gustavo Martins Vieira
Summary: Hydrocyclones are used to separate solid or liquid particles from a liquid phase. By replacing the walls of hydrocyclones with permeable walls, the performance of the filtering hydrocyclones was found to be better than conventional devices. This study evaluates the performance of a filtering and a conventional hydrocyclone operating with concentrate suspensions with pseudoplastic rheological behavior.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Engineering, Environmental
Raissa Aparecida da Silveira Rossi, Leilei Dai, Marcos Antonio de Souza Barrozo, Luiz Gustavo Martins Vieira, Carla Eponina Hori, Kirk Cobb, Paul Chen, Roger Ruan
Summary: This study investigates the catalytic microwave-assisted pyrolysis of microalgae in a tandem catalytic bed, aiming to reduce the formation of unwanted compounds and enhance aromatic hydrocarbon production. The results show that the hydrotalcite catalyst promotes de-acidification and de-nitrification reactions, while the zeolite catalyst converts intermediate compounds into hydrocarbons. The maximum hydrocarbon and benzene yields are achieved at a temperature of 500 degrees C and a NiHTC/SiC:NiHZSM-5/SiC catalyst ratio of 1:1. The study also provides important data on energy recovery and bio-oil quality during the catalytic pyrolysis of microalgae.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
Raissa Aparecida da Silveira Rossi, Dayana D'Arc de Fatima Palhares, Paula Cordeiro Rodrigues da Cunha, Joao Jorge Ribeiro Damasceno, Marcos Antonio de Souza Barrozo, Luiz Gustavo Martins Vieira
Summary: This study evaluates the optimal operational conditions for hydrogen production via alkaline water electrolysis using photovoltaic solar energy. The results suggest that using stainless steel electrodes and KOH electrolyte in combination with a photovoltaic panel can achieve high hydrogen purity and flow rates.
RENEWABLE ENERGY FOCUS
(2023)