Article
Engineering, Mechanical
Si-Liang Sun, Dong Liu, Ying-Ze Wang, Yuan-Li Qi, Hyoung-Bum Kim
Summary: This study numerically investigates the flow behavior and heat transfer properties of iron oxide microparticle suspension in a coaxial cylindrical annular gap with a magnetic field. The results show that increasing the Reynolds number and Hartmann number enhances the heat transfer capability of the Taylor vortex flow, with a maximum improvement of 8.09%. The magnetic field causes anisotropic velocity and temperature distributions, and the Lorentz force promotes particle motion and facilitates energy exchange. This research provides a new means to enhance heat transfer in Taylor-Couette flow using magnetic fields.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Multidisciplinary Sciences
Fuzhang Wang, Shafiq Ahmad, Qasem Al Mdallal, Maha Alammari, Muhammad Naveed Khan, Aysha Rehman
Summary: This article mainly focuses on the influence of chemical reaction slip condition on the unsteady three-dimensional Maxwell bio-convective nanomaterial liquid flow towards an exponentially expanding surface. The study examines the changes in temperature, velocity, microorganism, and concentration field through numerical calculations and graphical evaluation. The results show that the involvement of unsteadiness parameter restricts the transition from laminar to turbulent flow, while the velocity slip parameter has a decreasing effect on velocity components.
SCIENTIFIC REPORTS
(2022)
Article
Thermodynamics
T. Hayat, Inayatullah, S. Momani, K. Muhammad
Summary: This analysis focuses on the unsteady Darcy-Forchheimer flow and heat transfer of nanomaterial on a stretching sheet, taking into account nonlinear mixed convection, Brownian motion, thermophoresis diffusion, magnetic field, and viscous dissipation. The dimensionless PDEs are solved using a finite difference scheme, and various parameters such as entropy generation, skin friction, mass transfer rate, and heat transfer rate are discussed. Velocity and temperature of the fluid are shown to be affected by buoyancy, Forchheimer number, time, Eckert number, and nonlinear convection parameter. High values of Schmidt number lead to concentration decay but intensify with thermophoretic diffusion and time. Entropy production rate is influenced by Prandtl and Eckert numbers, as well as temperature ratio and volume ratio parameters.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Review
Thermodynamics
Zoljargal Narankhishig, Jeonggyun Ham, Hoseong Lee, Honghyun Cho
Summary: The review covers experimental and numerical investigations on the convective heat transfer of various nanofluids, especially hybrid nanofluids. Performance optimization of nanofluid heat and mass transfer is influenced by factors such as nanofluid characteristics, synthesis method, magnetic force, nanoparticle concentration and size, and Reynolds number. Studies have shown that the magnetic field in magnetic nanoparticles can significantly enhance the convective heat transfer performance of nanofluids.
APPLIED THERMAL ENGINEERING
(2021)
Article
Mathematics, Applied
Dipunja Gohain, Bijoy Krishna Taid, Nazibuddin Ahmed
Summary: In this study, the MHD water-based nanofluid flow past an impulsively started infinite vertical plate embedded in a porous medium is investigated, considering ramped velocity and concentration, as well as the presence of Hall effect, thermal radiation, chemical reaction, heat source/sink, and thermal diffusion. The governing equations are solved using the Laplace transform method, and the effects of various embedded parameters on velocity, temperature, and concentration profiles are analyzed through graphical interpretation. The variations of the Nusselt number, Sherwood number, and skin friction are also studied. It is found that higher nanoparticle volume fractions lead to reduced primary and secondary velocities and concentration, while increasing the temperature. Thermal diffusion increases the fluid concentration, and the rate of momentum transfer decreases with an increase in the Hall current parameter.
ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
(2023)
Article
Engineering, Mechanical
Priyajit Mondal, T. R. Mahapatra
Summary: This study investigates the double diffusive, MHD, mixed convection flow of Al2O3-water nanofluid in a trapezoidal enclosure, considering various inclination angles and aspect ratios. The research focuses on entropy generation related to heat transfer and mass transfer, finding that lower Richardson numbers lead to reduced entropy generation.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Chemistry, Inorganic & Nuclear
Arthur Zakinyan, Stanislav Kunikin, Andrey Chernyshov, Vitali Aitov
Summary: This study focuses on the development and suppression of thermal convection in a flat vertical quasi-two-dimensional layer of magnetic nanofluid, demonstrating the effectiveness of applying external magnetic fields to regulate convective heat transfer. It shows that an external uniform stationary magnetic field perpendicular to the temperature gradient can suppress convection, leading to a slowdown in the heating and cooling processes of metal plates in a magnetic nanofluid. The results obtained provide insights into similar exchange processes in liquids under the influence of a magnetic field.
Article
Physics, Applied
Maimona Rafiq, Mahrukh Shazadi, Gul-i-Hina Aslam, Nidhal Ben Khedher, Sayed Mohamed Tag-ElDin, Kamel Guedri
Summary: Entropy generation analyses of hybrid nanofluids via compliant wall tubes with peristalsis effects were conducted in this study. Mathematical models incorporating thermophysical properties of nanofluids and various shapes of nanoparticles were developed. Convective conditions on the boundary were considered. The momentum and energy equations were simplified using the lubrication approach and solved numerically using MATHEMATICA. Graphs were used to observe the impact of various parameters on flow quantities. The study revealed higher entropy generation for blade-shaped nanoparticles.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2023)
Article
Thermodynamics
Aliakbar Karimipour, Dariush Bahrami, Rasool Kalbasi, Azam Marjani
Summary: The study revealed that utilizing injection technique in the presence of a magnetic field in a microchannel containing FMWNT/water nanofluids can enhance heat transfer efficiency and reduce entropy generation; higher nanoparticle volume fraction and Reynolds number contribute to the amplification of the magnetic field effect.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Thermodynamics
Sangram Kumar Samal, Manoj Kumar Moharana
Summary: This study numerically investigates the thermo-hydraulic and entropy generation characteristics of water-based graphene-silver hybrid nanofluid in a recharging microchannel. The results show that using the hybrid nanofluid enhances heat transfer performance but also increases pressure drop and pumping power requirements.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Thermodynamics
Areum Lee, Yongseok Jeon, Veerakumar Chinnasamy, Honghyun Cho
Summary: The experimental results show that the convective heat transfer properties of cobalt-zinc ferrite nanofluids are significantly affected by magnetic field, with the CHT coefficient increasing with the concentration of nanofluids and the presence of a magnetic field.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Amir Hossein Shiravi, Mojtaba Shafiee, Mohammad Firoozzadeh, Hadis Bostani, Maryam Bozorgmehrian
Summary: The study investigates the main influencing factors of increasing the convective heat transfer coefficient, including flow rate and nanofluid concentration. Experiments conducted in the turbulent range showed that increasing the Reynolds number leads to an increase in CHTC and a decrease in the friction factor. Additionally, it was found that carbon nanofluid at a concentration of 0.21 mass% has significantly higher CHTC compared to pure water.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Mathematics, Interdisciplinary Applications
Mohammed Z. Swalmeh, Feras Shatat, Firas A. Alwawi, Mohd Asrul Hery Ibrahim, Ibrahim Mohammed Sulaiman, Nusayba Yaseen, Mohammad F. M. Naser
Summary: The micropolar liquid model can explain and predict the behavior of real fluids through studying the local structure and micromotions of liquid particles. In this study, the radiative heat transmission of micropolar fluid over a solid sphere is investigated, and it is found that the intensity of the magnetic field and the volume fraction of nanoparticles have effects on velocity and energy transport.
FRACTAL AND FRACTIONAL
(2022)
Article
Thermodynamics
Subhasree Dutta, Somnath Bhattacharyya, Ioan Pop
Summary: This study numerically analyzes the impact of an inclined magnetic field and Joule heating on the conjugate heat transfer of Al2O3-water nanofluid in a thick wall enclosure. The Lorentz force and Joule heating have adverse effects on flow, thermal field, heat transfer, and entropy generation. Adding nanoparticles enhances both heat transfer and entropy generation, with a higher enhancement in entropy generation compared to heat transfer. The relative slip velocity of nanoparticles diminishes as the magnetic field becomes stronger.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2021)
Article
Mechanics
U. K. Sarkar, Nirmalendu Biswas, Hakan F. Oztop
Summary: The study investigates the steady natural convection in a bottom-heated semi-elliptical enclosure using the finite volume method for different geometric and flow configurations. It is found that for aspect ratios A =1, 0.75, and 0.5, multiple steady solutions with counter-rotating convection cells appear when the Rayleigh number exceeds a critical value; however, such multiplicity is not observed for A = 0.25.
Article
Chemistry, Multidisciplinary
Abbas Mokhtari-Farsani, Masoud Hasany, Iseult Lynch, Mehdi Mehrali
Summary: This paper summarizes recent progress and important research in the biodegradation of carbon-based nanomaterials (CBNs), explores the potential impact of biomolecular corona (BMC) on CBN biodegradation, and points out the issue of overlooking BMC effects in current studies in the field.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Thermodynamics
Chung-Yu Yeh, K. J. F. Boonk, Gholamabbas Sadeghi, Mohammad Mehrali, Mina Shahi, Gerrit Brem, Amirhoushang Mahmoudi
Summary: This study explores a compact design of storage-integrated solar thermal collector and investigates the use of a shape stabilized phase change material (PCM) to improve the energy efficiency of a typical solar domestic water heating system. Experimental testing and numerical modeling were conducted to analyze the thermal properties of the developed PCM. The results show that optimizing the collector design can significantly extend the discharging period and improve the charging rate.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Sahand Rahemipoor, Mohammad Kohestanian, Ali Pourjavadi, Hossein Heidarzadeh Vazifehkhorani, Mehdi Mehrali
Summary: Multistimuli-responsive hyperbranched polymers were successfully synthesized in one step using RAFT-SCVP, showing controlled properties for potential sensor applications.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Energy & Fuels
Gholamabbas Sadeghi, Mohammad Mehrali, Mina Shahi, Gerrit Brem, Amirhoushang Mahmoudi
Summary: Investigations into the design of compact PCM-solar systems have shown that integrated flat plate storage systems are predominantly used for space heating, while concentrating solar collectors are primarily utilized in industrial applications, employing different phase change materials to provide varying temperature levels.
Review
Chemistry, Multidisciplinary
Aziz Maleki, Matineh Ghomi, Nasser Nikfarjam, Mahsa Akbari, Esmaeel Sharifi, Mohammad-Ali Shahbazi, Mehraneh Kermanian, Mohammed Seyedhamzeh, Ehsan Nazarzadeh Zare, Mehdi Mehrali, Omid Moradi, Farshid Sefat, Virgilio Mattoli, Pooyan Makvandi, Yu Chen
Summary: MXenes, as a new subclass of 2D materials, have shown great potential in biomedical applications, especially in drug delivery, tissue engineering, and biosensors. The integration of MXenes into hydrogels can enhance the electrical conductivity and mechanical properties of scaffolds, making it significant for biomedical engineering.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Physical
Amir Reza Akhiani, Hendrik Simon Cornelis Metselaar, Bee Chin Ang, Mehdi Mehrali, Mohammad Mehrali
Summary: This study introduces a new approach for facile assembly of graphene nanoplatelet (GNP) to overcome the practical application issues of phase change materials (PCMs) in solar-thermal technology. The embedded GNP enhances the loading of paraffin wax and transition enthalpy, resulting in excellent solar-thermal storage efficiency.
MATERIALS TODAY ENERGY
(2022)
Article
Construction & Building Technology
Ahmed Mahmoud Alnahhal, U. Johnson Alengaram, Muhammad Shazril Idris Ibrahim, Sumiani Yusoff, Hendrik Simon Cornelis Metselaar, Petrina Gabriela Johnson
Summary: This study investigated the influence of sand to binder ratio and various by-product materials on the structural grade geopolymer foamed concrete. The use of fine sand was found to improve the mechanical and micro-structural characteristics of the geopolymer foamed concrete. The results showed that the geopolymer foamed concrete had compressive strengths ranging from 27 to 39 MPa. Non-uniform distribution of voids and the formation of calcium aluminosilicate hydrates were also observed.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Thermodynamics
Gholamabbas Sadeghi, Mohammad Mehrali, Mina Shahi, Gerrit Brem, Amirhoushang Mahmoudi
Summary: This study addresses the issue of storage tank requirement in solar water heaters by experimentally applying a shape-stabilized phase change material (PCM) to a tankless solar collector. The research found that the thermal efficiency of the collector-storage system was significantly improved, showing potential for energy storage. Changing the flow rate had a limited impact on heat gain, but high flow rates reduced the discharge efficiency. Furthermore, the proposed system showed promising results in terms of cost savings and reduction in CO2 emissions.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Mechanics
Mohammed Abdul Qadeer Siddiqui, Emad Sadeghinezhad, Klaus Regenauer-Lieb, Hamid Roshan
Summary: Wettability is the key factor controlling fluid flow in an electrically neutral partially saturated micro-channel. This study investigates the movement of KCl electrolytes with different concentrations in an electrically charged micro-channel, and reveals the importance of both electro-osmosis and electrocapillary flow in partially saturated electrically charged micro-channels.
Article
Construction & Building Technology
Navid Ranjbar, Carsten Kuenzel, Carsten Gundlach, Paul Kempen, Mehdi Mehrali
Summary: This study investigates the role of halloysite nanotube as a mineral-based thixotropic admixture to 3D printable geopolymer mortar. The first part of the study focuses on the thermal evolution of halloysite at different temperatures. The second part examines how calcination and concentration of halloysite affect the properties of 3D-printable geopolymer mortar. It was found that the addition of 1-2 wt% halloysite significantly improves the rheological properties and buildability of the mortars without compromising their mechanical strength.
CEMENT & CONCRETE COMPOSITES
(2023)
Article
Green & Sustainable Science & Technology
Sahand Rahemipoor, Masoud Hasany, Mohammad Mehrali, Kristoffer Almdal, Navid Ranjbar, Mehdi Mehrali
Summary: The advent of 3D printing revolutionizes conventional construction by providing a cost-effective and fast method for constructing complex structures. This study presents an environmentally friendly approach by integrating Macroencapsulated Phase Change Materials (MEPCM) into a 3D printable geopolymer paste (GPP) derived from fly ashes, promoting sustainable buildings and reducing energy consumption.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Thermodynamics
Faezeh Rostamian, Nasrin Etesami, Mehdi Mehrali
Summary: In this study, microencapsulation of phase change materials (PCMs) was conducted for temperature management of satellite electronic boards. The synthesized microcapsules showed stability and a significant delay in reaching critical temperature, indicating the effectiveness of microencapsulated PCMs (MPCMs) in temperature management. The results demonstrate that MPCMs are a promising approach for managing the temperature of satellite electronic boards.
APPLIED THERMAL ENGINEERING
(2024)
Article
Materials Science, Multidisciplinary
Sahand Rahemipoor, Mohammad Kohestanian, Ali Pourjavadi, Hossein Heidarzadeh Vazifehkhorani, Mehdi Mehrali
Summary: In this study, multistimuli-responsive hyperbranched polymers were successfully synthesized in one step using the RAFT-SCVP method, allowing for control of molecular weights and degree of branching. These smart hyperbranched polymers exhibit responses to various stimuli such as UV-vis or sunlight, pH changes, and temperature changes.
ACS APPLIED POLYMER MATERIALS
(2022)
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.
