Article
Environmental Sciences
Saulo Brito-Espino, Tania Garcia-Ramirez, Federico Leon-Zerpa, Carlos Mendieta-Pino, Juan J. Santana, Alejandro Ramos-Martin
Summary: This study presents an original 3D code in FreeFem++ to replicate the behavior of anaerobic microorganisms in non-stirred anaerobic reactors with intermittent feeding. A mathematical model based on partial differential equations was used to consider the physical and biochemical phenomena. The implementation of the structured AMD1 model described the anaerobic metabolism. The Galerkin finite element method was utilized to solve the defined partial differential equations in the model. The inclusion of this e-learning tool in virtual laboratories enhances engineering students' understanding of the metabolism in non-stirred anaerobic reactors and promotes environmental sensitivity and circular economy awareness.
Article
Engineering, Chemical
J. I. Corcoles, A. Acosta-Iborra, J. A. Almendros-Ibanez, C. Sobrino
Summary: This paper presents the results of a 3-D numerical simulation of a freely bubbling fluidized bed using the software Barracuda (CPFD-Barracuda). The results obtained from CPFD-Barracuda show satisfactory predictions of the global behavior of bubbling beds, but with some deviations in bubble sizes and velocities compared to experiments and more common numerical approaches. The sensitivity of bubble characteristics to the chosen particle fraction threshold value is also discussed, with CPFD-Barracuda showing less sensitivity compared to other methods.
ADVANCED POWDER TECHNOLOGY
(2021)
Article
Thermodynamics
D. Sanchez, J. A. Almendros-Ibanez, A. Molina, F. Bozzoli, L. Cattani, J. I. Corcoles
Summary: This study presents the results of a numerical simulation on the heat transfer performance of Newtonian and non-Newtonian fluids in a helical coiled tube under laminar regime. The rheological properties of the non-Newtonian fluids significantly influence the heat transfer rate, with higher heat transfer occurring in the helical section compared to the straight section. Furthermore, the mixing of the non-Newtonian fluids is improved in the coil section, leading to enhanced heat transfer.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Physics, Multidisciplinary
Lila Achour, Mathieu Specklin, Idir Belaidi, Smaine Kouidri
Summary: This study conducts a computational analysis of the performance and flow characteristics of a centrifugal pump with volute handling emulsions and oil-water mixtures, modeling them as a shear-thinning non-Newtonian fluid. Experimental measurements and viscosity models were used to study the rheological behavior of the mixtures. Results showed that the flow topology in the pump is directly influenced by the viscosity plateau of the pseudoplastic behavior of emulsions, which in turn affects the pump performance.
Article
Mechanics
Muhammed Abdulrazaq, Armin Shahmardi, Marco Edoardo Rosti, Luca Brandt
Summary: The extensional dynamics of an elasto-viscoplastic fluid is investigated through numerical simulations and experimental modeling. The study explores the effects of different factors, such as yield stress, surface tension, viscosity ratio, and extension rates, on the material behavior. The results demonstrate the importance of yield stress in determining the material's deformation, with interfacial forces also playing a significant role. The findings contribute to a better understanding of the dynamics of elastoviscoplastic fluids.
JOURNAL OF NON-NEWTONIAN FLUID MECHANICS
(2023)
Article
Computer Science, Interdisciplinary Applications
Alibek Issakhov, Aizhan Abylkassymova, Assylbek Issakhov
Summary: This paper presents a three-dimensional model for dam break flows over fixed and movable beds. The model takes into account the transport and deposition of solid particles, as well as the movement of the free surface of water and mud. The model has been shown to be reliable and well balanced, and can accurately capture dam break flow movement in complex terrain. Additionally, the model has been successfully used to simulate a partial dam break scenario.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Thermodynamics
Amin Shahsavar, Mohammad Amin Bakhshizadeh, Muslum Arici, Masoud Afrand, Sara Rostami
Summary: The combined use of twisted tubes and nanofluid can significantly improve the performance of a double-pipe heat exchanger, especially at higher Reynolds numbers. Nanofluid generally outperforms the base fluid in most cases, and the overall hydrothermal performance shows an ascending-descending trend with twist pitch variations.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Mechanics
A. Haque, A. K. Nayak, S. Bhattacharyya
Summary: This study examines the mixing performance in a modulated micro-channel filled with non-Newtonian power-law fluid by considering the combined effects of geometrical and surface potential heterogeneity. Analytical solutions are obtained for the electric potential and velocity, while Poisson-Nernst-Planck-Navier-Stokes equations are computed to evaluate the electroosmotic flow. The study shows that mixing efficiency can be enhanced by the combined effect of geometric modulation and surface potential heterogeneity.
Article
Polymer Science
Wenqian Lin, Zhenna Li, Shanliang Zhang, Jianzhong Lin
Summary: This paper numerically studies the contraction/expansion laminar flow with rodlike particles in power-law fluid at a dilute phase. The effects of Reynolds number (Re), power index (n), and particle aspect ratio (beta) on the spatial and orientation distributions of particles are analyzed. The results show that particle distribution is influenced by the fluid type, with more dispersion in contraction flow for shear-thickening fluid and more gathering near the walls in expansion flow. The orientation distribution of particles is affected by Re, n, and beta, with larger beta leading to a more obvious alignment with the flow direction.
Article
Engineering, Chemical
Kourosh Javaherdeh, Habib Karimi, Abbas Khojasteh
Summary: This study investigates the heat transfer enhancement and pressure drop in a parallel channel partially filled with porous blocks and non-Newtonian nanofluid. Increasing the Reynolds number can improve heat transfer, and using a non-Newtonian nanofluid with a power-law index of 1.5 can achieve a higher Nusselt number compared to Newtonian fluids.
Article
Physics, Applied
A. Hobiny, M. Tabrez, W. A. Khan, I. Hussain
Summary: The effects of viscous dissipation and magnetic parameter on the flow of ferromagnetic Carraeu fluid on a stretching surface are studied. Nonlinear partial differential equations are transformed into nonlinear ordinary differential equations using the bvp4c mathematical technique. The study examines the influences of ferromagnetic interaction factor, Curie temperature, viscous dissipation, and material parameter on temperature and velocity fields, and describes the variations in velocity and thermal gradients with the help of graphs. Increase in magnetic interaction parameter and Weissenberg number leads to a decrease in velocity field while the thermal gradient shows opposite behavior. It is found that the temperature of Carreau fluid intensifies for larger parameters.
MODERN PHYSICS LETTERS B
(2023)
Article
Chemistry, Multidisciplinary
Ebrahem A. Algehyne, Haifaa F. Alrihieli, Muhammad Bilal, Anwar Saeed, Wajaree Weera
Summary: In this study, the pseudoplastic model is used to analyze the mass and energy transmission through a stretched permeable surface using trihybrid nanofluid. The influence of porosity is examined by employing the Darcy-Forchheimer relation in the momentum equation. The thermal efficiency of the nanocrystals is evaluated by integrating them with a pseudoplastic substrate. The findings show that the hybrid and trihybrid nanofluids have a greater tendency for fluid energy and velocity propagation rate compared to simple nanofluids, with an enhancement in velocity and heat transition rate.
Article
Physics, Multidisciplinary
Aziz Ullah Awan, Sonia Majeed, Bagh Ali, Liaqat Ali
Summary: This article provides a comparative study on the rotational Prandtl host fluid flux of aggregated and non-aggregated nanoparticles on a linear stretching surface. The study examines the chemical species diffusion and Arrhenius activation energy. The results show that the parameters have significant effects on heat, velocity, and nanoparticle concentration.
CHINESE JOURNAL OF PHYSICS
(2022)
Article
Physics, Fluids & Plasmas
C. Livi, G. Di Staso, H. J. H. Clercx, F. Toschi
Summary: The study compares and investigates different numerical approaches for modeling the dynamics of finite-size particles using the lattice Boltzmann method. By introducing a boundary condition to approximate the flow properties of an unbounded fluid in a finite simulation domain, the study shows that detrimental effects on the dynamics of particles can be suppressed effectively. Additionally, an improved equilibrium interpolation scheme is proposed to accurately capture the boundaries of particles and increase the accuracy of particle dynamics compared to other schemes.
Article
Mathematics, Applied
Petr Svacek, Jaromir Horacek
Summary: This paper presents a simplified mathematical model related to human phonation process, focusing on the treatment of vocal fold vibrations excited by viscous incompressible airflow. The Hertz impact model is used in the structural part, with two new strategies suggested for treating contact phenomena in the fluid model. Numerical discretization is done using a finite element method, with numerical approximation using penalty approach in the airflow boundary condition and a thin porous layer in the glottis during glottal closure. Numerical results are presented and discussed.
JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS
(2021)
Article
Engineering, Chemical
Salah Zouaoui, Hassane Djebouri, Kamal Mohammedi, Sofiane Khelladi, Aomar Ait Aider
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2016)
Article
Energy & Fuels
Fatah Boufoudi, Sofiane Mihoub, Salah Zouaoui, Abdelillah Benahmed
Summary: The disadvantage of using nanofluids in Parabolic Trough Concentrating solar power plant is increased pressure drops. Therefore, optimizing the receiver pipe diameter is crucial. The aim of this study was to optimize a new receiver to investigate the performance of nanofluid-based Parabolic Trough Concentrating plants in different regions in southern Algeria. The results showed that the addition of nanoparticles increased thermal conductivity and density of the nanofluid, while specific heat capacity was proportional to temperature. The most favorable site was found to be In salah, with an optimal capacity factor of 51%.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2023)
Article
Nanoscience & Nanotechnology
Fatah Boufoudi, Salah Zouaoui, Sofiane Mihoub, Abdelillah Benahmed, Tahar Tayebi
Summary: This study investigates the effect of temperature and volume fraction on the thermo-physical properties of different nanofluids. Experimental results show that adding 4% Al2O3 significantly improves the thermo-physical properties, and increasing temperature decreases the viscosity. The addition of nanoparticles also increases the thermal conductivity by 13%. The (Al2O3 + CuO/Dowtherm A) hybrid nanofluid seems to be attractive for CSP applications.
JOURNAL OF NANOFLUIDS
(2023)
Article
Engineering, Multidisciplinary
A. Iguercha, S. Zouaoui, K. Mohammedi, M. Bouaziz, D. Kari
Summary: This study aims to recover the residual energy of water treatment plants using turbines, instead of wasting energy in dissipators. The analysis of technical efficiency and assessment of hydroelectric potential led to proposed options for turbine installations. It was estimated that a maximum of 7.44 GWh of energy can be recovered, resulting in the savings of 446,210 tons of carbon emissions. The evaluation of profitability for the project integrating an energy recovery device is deemed fair.
JOURNAL OF MATERIALS AND ENGINEERING STRUCTURES
(2022)
Article
Engineering, Mechanical
H. Djebouri, S. Zouaoui, K. Mohammedi
Summary: This study numerically investigates the effect of medium heterogeneity and fractures on the viscous fingering instability at the water-oil interface. Three different configurations are studied and the regions where the instability varies during displacement are determined by comparing different cases.
INTERNATIONAL JOURNAL OF MULTIPHYSICS
(2022)
Article
Engineering, Mechanical
H. Djebouri, S. Zouaoui, K. Mohammedi
Summary: The study focuses on the displacement of immiscible fluids in a medium and investigates the factors affecting instability phenomena. Results show that the heterogeneity of the medium and the presence of fractures can impact the behavior of instability.
INTERNATIONAL JOURNAL OF MULTIPHYSICS
(2022)
Article
Engineering, Mechanical
S. Zouaoui, H. Djebouri, B. Ferhat, K. Mohammedi
Summary: The numerical method presented here is aimed at computing the motion of rigid particles in fluid flow with a non-elastic impact law. The contact handling algorithm is based on projecting the velocity field of the rigid particles over the velocity field of the fluid flow. An Uzawa algorithm has been applied in this case study.
INTERNATIONAL JOURNAL OF MULTIPHYSICS
(2021)
Article
Mathematics, Applied
Salah Zouaoui, Hassane Djebouri, Ali Bilek, Kamal Mohammedi
MATHEMATICS IN COMPUTER SCIENCE
(2017)