Article
Multidisciplinary Sciences
Ammar I. Alsabery, Tahar Tayebi, Hakim T. Kadhim, Mohammad Ghalambaz, Ishak Hashim, Ali J. Chamkha
Summary: The study investigates the influence of a two-phase hybrid nanofluid approach on mixed convection characteristics, considering factors such as nanoparticle migration and the presence of solid obstacles. The analysis of non-dimensional parameters using the finite element technique reveals that temperature gradient can lead to significant concentration variations within the enclosure.
JOURNAL OF ADVANCED RESEARCH
(2021)
Article
Thermodynamics
Ammar Alsabery, Mohammad Vaezi, Tahar Tayebi, Ishak Hashim, Mohammad Ghalambaz, Ali J. Chamkha
Summary: This study investigates mixed convection of nanofluid within a wavy lid-driven enclosure with a prominent heat source. A two-phase method is used for the nanoliquid, resulting in a non-homogeneous concentration field. The governing equations are solved using the finite element technique. The study examines the effects of adding nanoparticles, wave number and amplitude of the wavy walls, and the aspect ratio of the heat source on heat transfer rate.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Physics, Multidisciplinary
P. Sudarsana Reddy, P. Sreedevi
Summary: The study numerically analyzed the natural convection flow and heat transfer characteristics of Buongiorno's mathematical model nanofluid flow inside a square cavity, showing an increase in heat transfer rate with rising Rayleigh number.
CHINESE JOURNAL OF PHYSICS
(2021)
Article
Mathematics, Interdisciplinary Applications
V. Puneeth, S. Manjunatha, J. K. Madhukesh, G. K. Ramesh
Summary: This study investigates the role of mixed convection, Brownian motion, and thermophoresis in the dynamics of Casson hybrid nanofluid, revealing better heat and mass transfer characteristics in linear stretching sheets, an enhancement in fluid flow velocity with the mixed convection parameter, opposite effects in the thermal and concentration fields, and a decrease in flow velocity with an increase in the yield stress due to the rise in the Casson parameter.
CHAOS SOLITONS & FRACTALS
(2021)
Article
Computer Science, Interdisciplinary Applications
Jawali C. Umavathi, Ali J. Chamkha
Summary: This study investigates the instability of a horizontal sparsely filled nanofluid porous layer saturated with a binary mixture and fast chemical reaction. The presence of nanoparticles is found to increase the critical Rayleigh number and stabilize the system, while the chemical reaction parameter destabilizes the system. The results also provide insights into the oscillatory and stationary convection behavior in the system.
MATHEMATICS AND COMPUTERS IN SIMULATION
(2021)
Article
Thermodynamics
J. Tibaut, T. Tibaut, J. Ravnik
Summary: This paper presents a numerical study of laminar mixed convection of a nanofluid in a pipe and compares the results with experimental measurements. The research found that the distribution of nanoparticle concentration has a significant impact on the temperature field in both the fluid and the pipe.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Thermodynamics
Jordi Pallares, Alexandre Fabregat
Summary: This study introduces a model for predicting particle deposition velocities on isothermal walls in turbulent natural convection flow at moderate Rayleigh numbers, taking into account various influencing factors. The model is verified by comparisons with Direct Numerical Simulations and experimental measurements reported in the literature.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Mathematics
Hossam A. Nabwey, Waqar A. Khan, A. M. Rashad, Fazal Mabood, Taha Salah
Summary: This study investigates the behavior of a power-law nanofluid's mixed bio-convective stagnation point flow approaching a stretchable surface with a passively controlled boundary condition. The study highlights the impact of various parameters on the distribution and transport properties. The findings have significant implications for the engineering application of nanofluids.
Article
Thermodynamics
M. Salehi, S. R. Afshar, Rifaqat Ali, Ali J. Chamkha
Summary: This research investigates the impact of natural convection on the heat transfer efficiency of TiO2-water nanofluid in a porous wavy circular area with a 1-shaped heater under a constant magnetic field. The finite element technique is used to solve the governing equations, and the effects of various variables on the heat transfer of the ferrofluid are analyzed. The findings reveal that increasing the aspect ratio and Hartmann number results in a decrease in the local Nusselt number and the maximum streamline, respectively.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Physics, Multidisciplinary
Y. Akbar, F. M. Abbasi, U. M. Zahid, S. A. Shehzad
Summary: The study investigates the entropy generation rate in mixed convective peristaltic motion of a reactive nanofluid through an asymmetrical divergent channel, revealing that improving Brownian motion and thermophoresis parameters increases entropy generation. The temperature of the nanofluid decreases due to rising buoyancy forces caused by concentration gradient, while the concentration profile and velocity increase with chemical reaction and Brownian motion parameter enhancements, respectively.
COMMUNICATIONS IN THEORETICAL PHYSICS
(2021)
Article
Multidisciplinary Sciences
Manoj Kr. Triveni, Rajsekhar Panua
Summary: A computational study was conducted to investigate the heat transfer around an isothermally heated circular cylinder moving at different locations within a square enclosure. The results showed that the average Nusselt number is significantly influenced by the cylinder position, with the maximum value found at a specific location. Additionally, it was observed that the average Nusselt number increases with higher nanoparticle concentrations and Rayleigh numbers, and lower Richardson numbers.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Chemical
Mehrdad Mesgarpour, Somchai Wongwises, Rasool Alizadeh, Hamid Mohammadiun, Mohammad Mohammadiun
Summary: The study compared three different methods for simulating natural convection heat transfer in nanofluids, showing that initial conditions have a significant impact on the accuracy of simulations and parameters like the Rayleigh number. Based on the research, recommendations were made to choose the appropriate simulation method under different Rayleigh number conditions.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2021)
Article
Thermodynamics
Nikita S. Gibanov, Muzamil Hussain, Mikhail A. Sheremet
Summary: This study focuses on the mixed convection of aluminum oxide-water nano-suspension in a closed chamber with a moveable upper boundary and a semicircular heat source of constant temperature, considering the impacts of thermal radiation and uniform horizontal magnetic field. The mathematical model is developed based on mass, momentum, and energy conservation laws, and the dimensionless system of equations is numerically solved to investigate the effects of various parameters on fluid flow, establishment time of the quasi-stationary regime, and efficiency of heat transfer. The results reveal that effective energy removal can be achieved under the influence of magnetic field and nanoparticles addition.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Engineering, Chemical
R. Harish, R. Sivakumar
Summary: This numerical study investigates the mixed convection flows and heat transfer performance of nanofluids in a cubical enclosure under turbulent conditions. The results show higher temperature and turbulent kinetic energy distributions for opposing flows compared to assisting flows, with an increase in average heat transfer rate observed with a decrease in Richardson number and an increase in volume fraction for both flow types. Additionally, the effects of Brownian motion and thermophoresis are more pronounced in assisting flows.
Article
Energy & Fuels
Boris V. Balakin, Mattias Stava, Anna Kosinska
Summary: This article studies the application of aqueous magnetic nanofluid in a direct absorption solar collector, and develops an empirical model of photothermal convection based on experiments, resulting in a maximum thermal efficiency of 65%.
Article
Multidisciplinary Sciences
Eduardo Rossi, Gholamhossein Bagheri, Frances Beckett, Costanza Bonadonna
Summary: Research has shown that volcanic ash aggregates can delay the sedimentation of ash particles, increasing their residence time in the atmosphere. The rafting effect of volcanic ash can also significantly increase the travel distances of particles, which has important implications for hazard assessment and weather modeling related to volcanic ash dispersal.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Freja Nordsiek, Eberhard Bodenschatz, Gholamhossein Bagheri
Summary: In cases of airborne diseases, pathogens are transmitted through respiratory tract fluid droplets in indoor environments, typically modeled using the Wells-Riley model. However, the presence of poly-pathogen aerosols can break the mono-pathogen assumption, leading to a significant overestimation of infection risk. This study introduces a generalized model for poly-pathogen aerosols within the Wells-Riley framework, offering a more accurate computational risk assessment method.
Article
Thermodynamics
Shayan Naseri Nia, Faranak Rabiei, M. M. Rashidi
Summary: This study utilized the Lattice Boltzmann method to numerically simulate the natural convection heat transfer of Cu-water nanofluid in an L-shaped enclosure with curved boundaries. The investigation found that the curved boundaries have effects on natural convection in different parameter ranges, with the top curved boundary causing a notable increase in Nusselt number values. The study also compared the results of curved L-shape models to rectangular L-shape models and validated the curved boundary LBM simulation with existing studies.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2022)
Article
Chemistry, Multidisciplinary
M. M. Rashidi, M. Sadri, M. A. Sheremet
Summary: This study simulated the energy transference of a hybrid nanosuspension under the influence of a magnetic field, showing that the solid volume fraction of nanoparticles in the hybrid nanofluid has a significant impact on heat transfer efficiency. Proper selection of flow parameters like Richardson number and Hartmann number can enhance the heat transmission rate.
Article
Engineering, Multidisciplinary
M. A. Sheremet, M. M. Rashidi
Summary: This research simulated free convection of alumina nanoliquid to study the influences of energy transport and flow structures, finding that increasing the fins height and particles concentration can enhance heat removal from the heated source.
ALEXANDRIA ENGINEERING JOURNAL
(2021)
Article
Thermodynamics
M. Khoshvaght-Aliabadi, A. Abbaszadeh, M. M. Rashidi
Summary: This study compares the applications of co- and counter-current modes in wavy minichannel heat sinks, finding an increasing dependence of thermal and hydraulic characteristics on Reynolds number with increasing wave-amplitude and decreasing wave-length. The use of counter-current mode significantly improves temperature uniformity at the same pumping power.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Chemistry, Physical
Avinash Alagumalai, Caiyan Qin, K. E. K. Vimal, Evgeny Solomin, Liu Yang, Ping Zhang, Todd Otanicar, Alibakhsh Kasaeian, Ali J. Chamkha, Mohmammad Mehdi Rashidi, Somchai Wongwises, Ho Seon Ahn, Zhao Lei, Tabassom Saboori, Omid Mahian
Summary: Despite significant efforts in the field of nanofluids over the past two decades, their widespread commercial application has been hindered by various controllable and uncontrollable barriers. Long-term stability issue is identified as the main driver in the effective implementation of nanofluids at commercial scale. Research in this direction may help address the most influential barriers to nanofluid market uptake.
Article
Engineering, Mechanical
M. M. Rashidi, M. Alhuyi Nazari, I Mahariq, N. Ali
Summary: In this paper, the thermal conductivity of nanofluids containing alumina nanoparticles is modeled using intelligent techniques. The results show that modeling with Multi-Layer Perceptron and Group Method of Data Handling has high prediction accuracy. Sensitivity analysis reveals that the thermal conductivity of the base fluid plays the most significant role in the thermal conductivity of the nanofluids.
EXPERIMENTAL TECHNIQUES
(2023)
Article
Physics, Multidisciplinary
R. P. Sharma, Om Prakash, I Rashidi, S. R. Mishra, P. S. Rao, F. Karimi
Summary: The study analyzes the free convection of electrically conducting nanofluid past a linearly permeable expanding surface, taking into account external heat source, nonlinear thermal radiation, and Joule heating. It is found that the magnetic field and suction slow down fluid movement, but higher electric field strength enhances the magnetic field strength and viscosity. Additionally, an increase in radiative heat and heat source leads to nanofluid temperature development, with the Nusselt number enhancing with the thermal radiation parameter.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Review
Engineering, Multidisciplinary
Khalid Almutairi, Mohammad Alhuyi Nazari, Mohamed Salem, Mohammad Mehdi Rashidi, Mamdouh El Haj Assad, Sanjeevikumar Padmanaban
Summary: This article reviews the applications of solar energy for preheating air and steam in thermal power plants, and discusses the effects on performance enhancement and fuel consumption reduction. Meanwhile, the application of thermal storage units can enhance system reliability and the contribution of solar energy.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Engineering, Chemical
Oliver Schlenczek, Birte Thiede, Laura Turco, Katja Stieger, Jana M. Kosub, Rudolf Mueller, Simone Scheithauer, Eberhard Bodenschatz, Gholamhossein Bagheri
Summary: Activities such as singing or playing wind instruments can release respiratory particles and pose a risk for infection transmission. However, playing wind instruments carries a lower risk of airborne disease transmission compared to speaking or singing due to the filtering properties of the instrument's resonators for larger particles.
JOURNAL OF AEROSOL SCIENCE
(2023)
Article
Engineering, Chemical
Gholamhossein Bagheri, Oliver Schlenczek, Laura Turco, Birte Thiede, Katja Stieger, Jana M. Kosub, Sigrid Clauberg, Mira L. Poehlker, Christopher Poehlker, Jan Molacek, Simone Scheithauer, Eberhard Bodenschatz
Summary: Understanding how infection is transmitted and evaluating the effectiveness of protective measures is crucial in pandemics caused by human respiratory particles. Age is found to be the most important factor affecting the concentration of small exhaled particles. Other factors such as gender, body mass index, smoking or exercise habits have no significant effect. The cumulative volume of PM5 is higher in adults compared to children, while the concentration of larger particles is independent of age.
JOURNAL OF AEROSOL SCIENCE
(2023)
Review
Physics, Multidisciplinary
Mira L. Poehlker, Christopher Poehlker, Ovid O. Krueger, Jan-David Foerster, Thomas Berkemeier, Wolfgang Elbert, Janine Froehlich-Nowoisky, Ulrich Poeschl, Gholamhossein Bagheri, Eberhard Bodenschatz, J. Alex Huffman, Simone Scheithauer, Eugene Mikhailov
Summary: This review critically considers and summarizes scientific knowledge on the properties of respiratory particles, including their number concentrations, size distributions, composition, and mixing state. It proposes a parameterization approach based on these properties to trace and locate the sources of infectious particles, which can support medical treatment and risk assessment. The study confirms the high relevance of vocalization in the transmission of SARS-CoV-2 and highlights the effectiveness of preventive measures such as physical distancing, face masks, ventilation, and air filtration against COVID-19 and other airborne infectious diseases.
REVIEWS OF MODERN PHYSICS
(2023)
Article
Mechanics
Faranak Rabiei, Fatin Abd Hamid, Mohammad Mehdi Rashidi, Zeeshan Ali, Kamal Shah, Kamyar Hosseini, Touraj Khodadadi
Summary: In this research, a fourth-order Improved Runge-Kutta method with three stages is proposed for solving fuzzy Volterra integro-differential equations. The advantage of this method is that it uses fewer stages in each step, resulting in lower computational cost. The integral part is approximated using Lagrange interpolation polynomials and Simpson's rule. The efficiency of the method is demonstrated by comparing its numerical results with other existing methods.
JOURNAL OF APPLIED AND COMPUTATIONAL MECHANICS
(2023)
Article
Environmental Sciences
Bardia Hejazi, Oliver Schlenczek, Birte Thiede, Gholamhossein Bagheri, Eberhard Bodenschatz
Summary: The study found that aerosol concentrations in large stores decreased rapidly and independently of aerosol size, regardless of different ventilation systems. A persistent directional airflow was observed in the stores. Therefore, the accumulation of infectious aerosols in large indoor spaces is unlikely to contribute significantly to the risk of infection, as long as the occupancy is not too high. Well-fitting face masks are an excellent means of preventing disease transmission by aerosols.
AEROSOL AND AIR QUALITY RESEARCH
(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.
