Article
Thermodynamics
M. K. Nayak, V. S. Pandey, S. Shaw, O. D. Makinde, K. M. Ramadan, Mouna Ben Henda, Iskander Tlili
Summary: The investigation analyzed the flow and heat transfer behavior of a non Newtonian fluid subject to an externally inclined magnetic field. The study revealed that the increase in magnetic field strength has an opposite effect on fluid velocity and temperature, while factors such as thermal relaxation time and curvature parameter play a role in controlling the rate of heat transportation. Additionally, the angle of inclination of the magnetic field affects the fluid flow in a reverse manner.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Mathematics, Applied
Bagh Ali, Yufeng Nie, Sajjad Hussain, Danial Habib, Sohaib Abdal
Summary: This article discusses the dynamics of fluid conveying tiny particles and the effects of Coriolis force on transient rotational flow towards a continuously stretching sheet, aiming to enhance heat transportation efficiency. The numerical solution of the coupled non-linear partial differential problem shows that increasing certain parameters can slow down velocities but raise the temperature. Additionally, the impact of viscosity on velocity, temperature, and species concentration differs.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Wen Wang, Mohammed M. M. Jaradat, Imran Siddique, Abd Allah A. Mousa, Sohaib Abdal, Zead Mustafa, Hafiz Muhammad Ali
Summary: This study explores the thermal transportation of dissipated flow of a Maxwell Sutterby nanofluid caused by an elongating surface, revealing the relationships between fluid velocity and type, temperature and various parameters, and the variations of Nusselt number with multiple factors.
Article
Thermodynamics
Abdul Hafeez, Masood Khan
Summary: The article introduces the Cattaneo-Christov heat and mass flux theories in the flow of Oldroyd-B fluid over a rotating disk, using it to solve heat and mass equations. Analytical solutions for velocity, temperature, and concentration distributions are obtained, showing that the temperature of the Odroyd-B fluid increases with the magnetic field parameter within a specific range. Additionally, velocities decrease with the magnetic field parameter, and temperature decreases as the thermal relaxation time parameter increases, while the solutal relaxation time parameter influences concentration distribution in a decreasing trend.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Physics, Multidisciplinary
Bagh Ali, Suriya Uma S. Devi, Ahmed Kadhim Hussein, Sajjad Hussain, Rizwan Ali Naqvi
Summary: Bioconvection for rotational flow is studied to enhance thermal transportation and optimize characteristics like thermal conductivity of nanofluid over Riga plate. Theoretical models incorporating Cattaneo-Christov theory and activation energy are used to simplify the three-dimensional formulation. Galerkin discretization in MATLAB environment is applied for finite element simulation of steady-state and unsteady temperature fields.
CHINESE JOURNAL OF PHYSICS
(2021)
Article
Thermodynamics
Zhao-Wei Tong, Sami Ullah Khan, Hanumesh Vaidya, Rajashekhar Rajashekhar, Tian-Chuan Sun, M. Ijaz Khan, K. Prasad, Ronnason Chinram, Ayman A. Aly
Summary: Nanofluids have shown to be effective in enhancing thermal transportation systems in industrial and engineering applications. They have unique thermal properties with applications in heat exchanges, cooling processes, medical treatment, electronic cooling systems, energy production, and more. This study focuses on the thermal aspects of Oldroyd-B nanofluids in bioconvection phenomenon, incorporating thermal radiation relations, activation energy, and modifications in heat and mass equations based on Cattaneo-Christov theories. The research also explores applications in various fields such as thermal extrusion processes, power plants, heat/mass processes, information technology, and more through numerical simulations and graphical representations.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Thermodynamics
S. M. Atif, A. Kamran, S. Shah
Summary: This study investigates the magnetohydrodynamic micropolar nanofluid past a stretching sheet using non-Fourier and non-Fick's models, showing the impact of various parameters on dimensionless profiles. The analysis includes viscous dissipation, thermal radiation, and Ohmic heating, with solutions obtained through similarity transformations and shooting approach. The simulations indicate that the concentration relaxation parameter decreases the energy and concentration profiles.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Physics, Multidisciplinary
Muhammad Yasir, Masood Khan, Awais Ahmed, Mahnoor Sarfraz
Summary: In this study, the rotation flow of Oldroyd-B nanofluid along a stretching surface is analyzed using the Cattaneo-Christov theory. The incorporation of Buongiorno's model of nanofluids is considered due to their enhanced heat transport. The mathematical modeling of momentum and energy laws is presented using an order analysis approach, and the resulting partial differential equations are transformed into ordinary differential equations using flow similarities. The homotopy analysis technique is then employed to obtain the series solution of these ordinary differential equations. The graphical results demonstrate the effects of various physical flow factors on the fluid velocity, temperature, and concentration. The findings reveal that thermal and solutal relaxation factors decrease the temperature and concentration distributions, and the inclusion of elastic effects leads to a thinner hydrodynamic boundary layer, which is further reduced by the rotation parameter.
WAVES IN RANDOM AND COMPLEX MEDIA
(2023)
Article
Thermodynamics
Shalan Alkarni, Muhammad Ramzan, C. Ahamed Saleel, Seifedine Kadry
Summary: This study examines the effects of Cattaneo-Christov double diffusion on the flow of Ostwald-de-Waele nanofluids with varying thicknesses. The inclusion of bioconvection microorganisms increases the stability of the nanofluids, while higher thermal and solutal relaxation parameters decrease the thermal and mass profiles.
NUMERICAL HEAT TRANSFER PART A-APPLICATIONS
(2023)
Article
Thermodynamics
Shan Ali Khan, Hassan Waqas, Syed Muhammad Raza Shah Naqvi, Metib Alghamdi, Qasem Al-Mdallal
Summary: The study focuses on the bioconvective cross diffusion flow of magnetized viscous nanofluid past multiple geometries with convective boundary conditions. Results show that the velocity field increases with larger Grashof number, while decreases with larger magnetic parameter. The heat transfer is increased with larger thermal Biot number, and the temperature of fluid is reduced with larger thermal relaxation parameter. The concentration of nanoparticles decreases with concentration relaxation parameter, and the microorganism's field decreases with variations of Peclet number.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Engineering, Multidisciplinary
Arfan Shahzad, Muhammad Imran, Madeeha Tahir, Shan Ali Khan, Ali Akgul, Sherzod Abdullaev, Choonkil Park, Heba Y. Zahran, Ibrahim S. Yahia
Summary: The present study focuses on the analysis of bioconvective micropolar nanofluid flow between coaxial, parallel, and radially stretching double disks, considering convective thermal boundary conditions, gyrotactic motile microorganisms, thermal conductivity, and thermal radiations. The effects of various physical and bioconvection parameters on velocities, microrotation, thermal field, nanoparticle concentration, and microorganisms' fields are presented using graphs and tables.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Thermodynamics
Yu Bai, Huiling Fang, Yan Zhang
Summary: This paper investigates the effect of entropy generation on the unsteady flow of upper-convected Maxwell nanofluid past a wedge embedded in a porous medium considering buoyancy force. The processes of energy phenomenon and mass transfer are simulated using Cattaneo-Christov double diffusion theory. Various factors such as Brownian motion, thermophoresis, and convective boundary conditions are discussed to visualize heat and mass transfer properties.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2022)
Article
Thermodynamics
Sami Ullah Khan, Rana Alabdan, Abdel-Rahman Al-Qawasmi, Ali Vakkar, Mouna Ben Handa, Iskander Tlili
Summary: Nanofluids have shown to be effective energy sources in various industrial processes, with applications in heat exchanges, cooling systems, and medical treatment. This study focuses on the flow characteristics of a Burgers fluid containing microorganisms, analyzing the impact of different parameters on fluid velocity, temperature distribution, and nanoparticle concentration. The observations reveal potential applications in improving cooling and heating processes, energy generation, and manufacturing.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Uzma Arif, M. Nawaz, Sayer Obaid Alharbi, S. Saleem
Summary: This article investigates the role of hybrid nano-particles in enhancing the thermal performance of Sutterby fluid over a two-dimensional body, with a focus on the numerical analysis showing a significant improvement due to the hybrid nano-particles.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Thermodynamics
S. A. Shehzad, T. Mushtaq, Z. Abbas, A. Rauf
Summary: An incompressible magnetized micropolar fluid flow confined between two disks is studied, considering the effects of microrotation and spinning inertia of microelements. The equations are modified using double-diffusive Cattaneo-Christov theories, reducing the set of partial differential equations into system of ordinary differential equations, solved using MATLAB. Results show that microrotation affects shear stresses and couple stresses of fluid particles, while injection tends to rotate particles in reverse direction.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Engineering, Mechanical
L. Ben Said, L. Kolsi, N. Ben Khedher, F. Alshammari, E. H. Malekshah, A. K. Hussein
Summary: This study numerically investigates the fluid-structure interaction during CNT-water nanofluid mixed convection in a micro-channel with elastic fins. The results show that fin oscillations can reduce drag and lift forces, improve heat transfer and cooling, and the dispersion of CNT nanoparticles in water-based fluid significantly enhances the convection process.
EXPERIMENTAL TECHNIQUES
(2023)
Article
Chemistry, Multidisciplinary
Milad Alizadeh, Amin Fazlollahtabar, Ahmed Kadhim Hussein, Hussein Ali Ameen, D. D. Ganji, Uddhaba Biswal, Bagh Ali
Summary: The interaction between magneto-hydrodynamic buoyant convection and radiation in a hexagonal enclosed space filled with SWCNTs/water nanoliquid was studied for the first time. The research examined the effects of various parameters on the fluid flow and heat transfer, including Rayleigh number, heated region length, internal hexagonal body conditions, solid volume fraction, and radiation parameter. The results showed that the Nusselt number along the heated bottom wall increased with increasing Rayleigh number, while the stream function and Nu(out) decreased as the Hartmann number increased. The profiles of stream function, temperature, and velocity were highest in the heated condition, followed by the adiabatic condition, and lowest in the cold condition.
KOREAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Energy & Fuels
Ahmed Kadhim Hussein, Mohammed El Hadi Attia, Husham Jassim Abdul-Ammer, Muesluem Arici, Mohamed Bechir Ben Hamida, Obai Younis, Raad Z. Homod, Awatef Abidi
Summary: In this research, low-cost energy storage materials were used to enhance the performance of single-slope solar distillers. The conventional distiller was modified by adding salt balls and sponges to the basin at different water depths. The findings showed that using these energy storage materials significantly increased the productivity of the modified solar distillers.
Article
Energy & Fuels
Mohammed El Hadi Attia, Ahmed Kadhim Hussein, Ganesh Radhakrishnan, Sivakumar Vaithilingam, Obai Younis, Nevzat Akkurt
Summary: This study conducted experimental research on the impact of reflective aluminum foils, metal sheets, and phosphate granules on the productivity and efficiency of hemispherical solar stills under solar conditions in El-Oued, Algeria. The results showed that the modified solar still with reflective aluminum foil, zinc metal sheets, and copper sheets demonstrated improved productivity compared to traditional solar stills. The addition of these materials increased radiation reflection and energy storage, leading to higher temperatures in the saltwater basin. In another experiment, it was found that the modified solar still with aluminum foil and phosphate granules exhibited the highest improvement rate in productivity compared to those with zinc metal sheets and phosphate granules, and copper metal sheets and phosphate granules.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2023)
Correction
Multidisciplinary Sciences
Bagh Ali, Imran Siddique, Hijaz Ahmad, Sameh Askar
SCIENTIFIC REPORTS
(2023)
Article
Materials Science, Multidisciplinary
Bing Zhang, Liqin Tang, Hongwei Zhang, Bagh Ali, Nehad Ali Shah, Yongseok Jeon
Summary: This study examines the significant role of particles spacing and radius of nanoparticles in a microgravity environment, inclined surface, and magnetic field. The analysis considers the variations in particles size and spacing in the microgravity environment. A mathematical formulation based on conservation principles is transformed into a non-dimensional form using similarity transformation. Finite element discretization is implemented and computations are performed on the Matlab platform. The study investigates the effects of radius, modulation amplitude, mixed convection, inclination angle, particles spacing, and magnetic parameter. The results show that increasing inter-particles spacing and radius directly affect fluid velocity and inversely affect fluid temperature. The strength of oscillation frequency and incline angle lead to a decrease in skin friction and heat transfer coefficients, while an increase in the thermal buoyancy parameter has the opposite effect. These findings provide valuable insights for researchers in controlling upper space transportation and device performance.
RESULTS IN PHYSICS
(2023)
Article
Mathematics
Bagh Ali, Anum Shafiq, Meznah M. M. Alanazi, Awatif A. A. Hendi, Ahmed Kadhim Hussein, Nehad Ali Shah
Summary: This study investigates the importance of varying the radius D-p of Copper nanoparticles for microgravity-modulated mixed convection in micropolar nanofluid flux under an inclined surface subject to a magnetic field and heat source. The results show that the size of nanoparticles greatly influences the flow and temperature of the nanofluid. Various parameters, such as D-p, modulation amplitude epsilon, material parameter beta, mixed convection parameter lambda, inclination angle gamma, and magnetic parameter M, significantly affect the Nusselt number, couple stress, and skin friction coefficient. These findings have important implications for space transportation and materials' performance.
Article
Mathematics
Bagh Ali, N. Ameer Ahammad, Windarto, Abayomi S. Oke, Nehad Ali Shah, Jae Dong Chung
Summary: This study investigated the thermodynamics of a rotating dusty Maxwell water-based nanofluid with suspended dust particles and explored the effects of increased volume fraction of TiO2 particles and dust on fluid dynamics. By using appropriate similarity transformations, the governing PDEs for both fluid and dusty-phase models were transformed into non-linear linked non-dimensional ODEs. The bvp4c technique in MATLAB was employed to obtain graphical results. The magnitude of primary and secondary velocities in both phases decreased with an increase in dust particle volume concentration, Lorentz force, rotating, and Maxwell fluid parameters. The temperature variation in both dust and nanofluid phases was influenced by the increased strength of dust particles and TiO2.
Article
Multidisciplinary Sciences
Humaira Sharif, Bagh Ali, Imran Siddique, Iqra Saman, Mohammed M. M. Jaradat, Muhammad Sallah
Summary: This study analyzes the momentum and thermic aspects of MHD Ellis ternary nanomaterial embedded with dust particles using a stretchable Riga plate. The flow equations are converted into dimensionless nonlinear ODEs to obtain graphical results. The study investigates the velocity and temperature profiles, as well as evaluates the Nusselt number and skin friction. The findings show that the thermal transport performance of the trihybrid nanophase is better than that of the dusty phase, with rotational and volume fraction dust particles parameters leading to increased temperature distribution.
SCIENTIFIC REPORTS
(2023)
Correction
Multidisciplinary Sciences
Humaira Sharif, Bagh Ali, Imran Siddique, Iqra Saman, Mohammed M. M. Jaradat, Mohammad Sallah
SCIENTIFIC REPORTS
(2023)
Article
Materials Science, Multidisciplinary
Qadeer Raza, Xiaodong Wang, Ahmed M. Hassan, Imran Siddique, Bagh Ali, Irfan Ali
Summary: This study focuses on the numerical modeling of coaxially swirling porous disk flow subject to the combined effects of mixed convection and chemical reactions. Numerical investigations were conducted to analyze the morphologies of aluminum oxide (Al2O3) and copper (Cu) nanoparticles under the influence of magnetohydrodynamics. A model considering the aggregate nanoparticle volume fraction based on single-phase simulation, along with the energy and mass transfer equations, was developed for the flow of hybrid nanofluids. The high-order, nonlinear, ordinary differential equations obtained from the governing system of nonlinear partial differential equations were solved numerically by the Runge-Kutta technique and the shooting method.
FRONTIERS IN MATERIALS
(2023)
Article
Mathematics, Applied
Afraz Hussain Majeed, Sadia Irshad, Bagh Ali, Ahmed Kadhim, Nehad Ali Shah, Thongchai Botmart
Summary: In this study, the thermal flow of a Maxwell fluid in a rotating frame is investigated using a numerical approach. The model incorporates a temperature-dependent thermal conductivity and a non-Fourier heat flux term to accurately simulate the effects of thermal relaxation. Boundary layer approximations are used to simplify the governing system of partial differential equations. The results demonstrate the impact of elastic factors on the hydrodynamic boundary layer thickness and the temperature wall slope, as well as provide a comparison between the Cattaneo-Christov and Fourier models.
Article
Engineering, Multidisciplinary
Farhan L. Rashid, Emad Q. Hussein, Laith J. Habeeb, Ahmed Kadhim Hussein, Mohamed Bechir Ben Hamida, Bagh Ali, Obai Younis
Summary: This research uses Computational Fluid Dynamics (CFD) to analyze the heat transfer and thermal stresses of the Apollo capsule during re-entry. The 3D finite element method is used to solve the coupled nonlinear partial differential equations, predicting the pressure and temperature distribution over the Apollo at different attack angles. The resulting stress and deformation on Apollo are obtained, showing extreme temperatures at the heat shield and decreased potential and kinetic energy.
JOURNAL OF ENGINEERING SCIENCE AND TECHNOLOGY
(2023)
Review
Engineering, Chemical
Faical Khlissa, Mohsen Mhadhbi, Walid Aich, Ahmed Kadhim Hussein, Muapper Alhadri, Fatih Selimefendigil, Hakan F. Oztop, Lioua Kolsi
Summary: This research conducts a thorough study and assessment of phase-change materials, highlighting the latest developments in nanoencapsulated PCM technology and thermal energy storage. It also acknowledges the efforts made by researchers to improve the efficiency and efficacy of PCM, and discusses current challenges and future directions.
Review
Energy & Fuels
Farhan Lafta Rashid, Mudhar A. Al-Obaidi, Nabeel S. Dhaidan, Ahmed Kadhim Hussein, Bagh Ali, Mohamed Bechir Ben Hamida, Obai Younis
Summary: Latent heat energy storage using phase change materials (PCM) is an effective method for reducing energy usage. Bio-based phase change materials (BPCM) offer a renewable and environmentally-friendly alternative to traditional PCM. This paper reviews and discusses the choice, mechanisms, preparation, and applications of BPCMs in detail.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Engineering, Chemical
Ri Zhang, Shasha Zhang, Mengyan Ding
Summary: A thin liquid film method is proposed to evaluate sand erosion in annular flow. This method considers the direct interaction between the liquid film and gas core, as well as the entrainment and deposition of droplets. The erosion rate is calculated by considering the effects of liquid entrainment and particle velocity decay. The method is fully verified by comparing with experimental data.
Article
Engineering, Chemical
Yu Suo, Xianheng Su, Wenyuan He, Xiaofei Fu, Zhejun Pan
Summary: This research investigates the mechanical properties of sandstone-shale composite through orthogonal experimental method and discrete element simulation. The results show that different lithologies and thickness ratios can affect the strength and fracture mode of the composite rock samples.
Article
Engineering, Chemical
Maurizio Troiano, Andrea El Hassanin, Roberto Solimene, Alessia Teresa Silvestri, Fabrizio Scala, Antonino Squillace, Piero Salatino
Summary: This study investigates the potential of Fluidized Bed Finishing (FBF) for square flat AlSi10Mg specimens manufactured via Laser-Powder Bed Fusion (L-PBF) additive manufacturing technology. The results show that good finishing can be achieved using rotation-assisted tests, with a maximum reduction of surface roughness by 67%. Steel particles are found to be the most effective bed material.
Review
Engineering, Chemical
Ningbo Song, Wanzhong Yin, Jin Yao
Summary: Seawater's dissolved salts and minerals have various effects on the flotation process, including influencing the characteristics and behavior of flotation factors, as well as affecting the surface of sulfide minerals. In most cases, seawater has adverse effects on the flotation of sulfide minerals, but these effects can be mitigated by adjusting the reagents.
Article
Engineering, Chemical
Kaiqiao Wu, Shuxian Jiang, Victor Francia, Marc-Olivier Coppens
Summary: In rectangular and cylindrical annular fluidized beds, pulsating gas flow can create regular bubble patterns, overcoming challenges seen in conventional units. This study provides new opportunities for modularization of fluidized bed operations.
Article
Engineering, Chemical
Shuo Li, Huili Zhang, Jan Baeyens, Miao Yang, Zehao Li, Yimin Deng
Summary: The paper assesses the behavior of cohesive Geldart C-type particles when fluidized by air with the aid of vibration. It determines that mechanical vibration is a simple and effective method to improve the fluidity of cohesive particles during fluidization.
Article
Engineering, Chemical
Zhenfei Feng, Qingyuan Zhang, Shanpan Liang, Zhenzhou Li, Fangwen Guo, Jinxin Zhang, Ding Yuan
Summary: A new micro/mini-channel heat sink (MCHS) with a combined structure of longitudinal and transverse vortex generators is designed, using Al2O3 nanofluid as the working medium. The study explores the effects of transverse vortex generator shape and longitudinal vortex generator angle on the hydraulic and thermal characteristics, comprehensive performance, entropy generation, and exergy efficiency. The results show that the triangular transverse vortex generator improves the comprehensive performance and exergy efficiency. Combined with the longitudinal vortex generator, the MCHS achieves the best comprehensive performance, entropy generation, and exergy efficiency when the Reynolds number is 742.
Article
Engineering, Chemical
Kostas Giannis, Christoph Thon, Guoqing Yang, Arno Kwade, Carsten Schilde
Summary: This study presents a 3D convolutional neural network (3D-CNN) methodology for generating realistic 3D models of particles. The method trains on 2D projections of particle images to predict their 3D shapes, and evaluates the accuracy of the predictions using Fourier shape descriptors (FSDs). This methodology has wide applications in particle shape analysis.
Article
Engineering, Chemical
Zheng-qing Zhou, Lu-jia Chai, Yu-long Zhang, Ya-bin Wang, Ze-chen Du, Tian-yi Wang, Yu-zhe Liu
Summary: The dynamic oxidation and shell-breaking processes of aluminum nanoparticles (ANPs) during heating were studied using in situ transmission electron microscopy. The results revealed that the changes in shell thickness can be divided into three stages, and the active aluminum content of ANP decreased before shell-breaking.
Article
Engineering, Chemical
Fulei Chen, Huaqing Ma, Zihan Liu, Lianyong Zhou, Yongzhi Zhao
Summary: A particle breakage model based on the particle replacement scheme, using the polyhedral model to describe particles, is proposed in this work to accurately describe the breakage of a large number of particles. Additionally, a fast-cutting algorithm is proposed to reproduce the size distribution of progeny particles determined by the breakage model. The validation and simulation results show satisfactory accuracy, efficiency, and stability of the algorithm.
Review
Engineering, Chemical
Matteo Errigo, Christopher Windows-Yule, Massimiliano Materazzi, Dominik Werner, Paola Lettieri
Summary: Gas-solid fluidized-bed systems have advantages in terms of chemical reaction efficiency and temperature control, making them widely used in industrial applications. However, the design, scale-up, and optimization of these complex units are limited by the lack of deep physical understanding. Non-invasive and non-intrusive diagnostic techniques provide a way for researchers to study these systems without affecting the flow field or directly contacting the medium under study.
Article
Engineering, Chemical
Saeed Fateh, Mohammad Behshad Shafii, Mohammad Najafi, Cyrus Aghanajafi
Summary: Applying a magnetic field to ferrofluids alters their flow characteristics and enhances heat transfer. Through visualization and quantitative investigation, it is found that the magnetic field influences the flow patterns and velocity profiles, improving fluid mixing and vorticity magnitude.
Article
Engineering, Chemical
Lei Gao, Bingbing Wei, Xiaochuan Hu, Zaifeng Yao, Yiwen Fang, Xuejian Gao
Summary: In this study, a numerical model of sand triaxial test was established using discrete element software PFC3D, and an indoor triaxial test was conducted to calibrate the numerical model. The influence of microscopic parameters on the macroscopic mechanical response of sand was analyzed. The results showed that the friction coefficient had the greatest impact on the peak strength and residual strength of the sand's stress-strain curve, and it was positively correlated. The normal tangential stiffness ratio was negatively correlated, while the porosity and boundary flexibility stiffness had minimal influence on it.
Article
Engineering, Chemical
Xuan Liu, Jie Gong, Kai Jiang, Xiaojuan Lai, Yu Tian, Kang Zhang
Summary: This study aimed to improve the performance of lignite coal water slurries (CWSs) by synthesizing a series of three-arm amphiphilic block copolymers. By controlling the relative molecular weight, hydrophilic/hydrophobic ratio, and ionic group content, the apparent viscosity of CWSs was significantly reduced and the static stability was improved. Thermogravimetric testing and XPS analysis were conducted to reveal the mechanism behind the improved performance.
Article
Engineering, Chemical
Lanka Dinushke Weerasiri, Daniel Fabijanic, Subrat Das
Summary: Fluidization at low pressure offers significant benefits for the fine chemical industry. This study investigates the behavior of bubbles and bed expansion under low pressure conditions. It is found that lower pressure leads to larger bubbles, increased bubble quantity, and higher aspect ratio. The predictability is affected by the inhomogeneous fluidization, but low pressure fluidization can generate similar bubble sizes with lower fluidizing mass compared to atmospheric pressure.
