Article
Thermodynamics
Kai-Xin Hu, Yan Huang, Xin-Yuan Zhang, Sheng Wang, Qi-Sheng Chen
Summary: The paper analyzes the flow of nanofluids in a channel with linearly varying wall temperature, applying a non-uniform equilibrium fluid medium model. Results show different distributions and variations in nanoparticle concentration and fluid properties under different cooling or heating conditions.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Physics, Multidisciplinary
Zahir Shah, Asad Ullah, Awad Musa, Narcisa Vrinceanu, Santiago Ferrandiz Bou, Shahid Iqbal, Wejdan Deebani
Summary: The aim of this research is to study the performance of hybrid eclectically conducting nanofluid (MWCNT-Fe3O4) with entropy optimization impacts using the CVFEM approach. The simulation results show an inverse relation between permeability and the Bejan number, and an increase in boundary layer thickness with intensification in Lorentz force.
FRONTIERS IN PHYSICS
(2022)
Article
Energy & Fuels
Jefferson Raja Bose, Stephen Manova, Appadurai Anitha Angeline, Lazarus Godson Asirvatham, Sneha Gautam
Summary: A numerical simulation was conducted to study the convective heat transfer coefficient (h(conv)) of Cu-Water and TiO2-Water nanofluids in a circular tube under laminar and turbulent flow conditions. The analysis involved four different concentrations of nanofluids and varying Reynolds numbers. The study found that the enhancements of h(conv) for both nanofluids were higher in turbulent flow compared to laminar flow, and were mainly influenced by the random motion and heat diffusion of the nanoparticles.
Review
Green & Sustainable Science & Technology
Mehmet Karatas, Yunus Bicen
Summary: Nanofluids have shown significant improvements in breakdown voltage, thermal conductivity, and other properties compared to traditional insulating fluids. Further research is needed to explore their full potential in electrical networks.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
Article
Chemistry, Physical
Saeid Vafaei, Jonathan A. Yeager, Peter Daluga, Branden Scherer
Summary: It was found that the characteristics of nanoparticles, base liquid, thermal conductivity and viscosity of nanofluid can significantly affect the heat transfer coefficient. Man-made anatase TiO2 nanoparticles were found to be more effective in enhancing the heat transfer coefficient.
Article
Chemistry, Physical
Puneet Rana, S. A. Shehzad, T. Ambreen, Mahmoud M. Selim
Summary: In this manuscript, steady naturally convected nanofluid flow involving thermal radiation has been simulated by involving the inclined magnetic field. Aluminum-oxide nanoparticles are submerged into ordinary electrically conducting H2O. Radiative phenomenon along with distinct nanoparticles shapes is executed. The problem is formulated with the help of basic principles of fluid mechanics and the code is designed for achieving problem solutions. The nature of radiated constraint, Rayleigh number, nanoparticles' shape and magnetic field on nanofluid is labeled and discussed for distinct important quantities. Results revealed that the conduction process is significant mode of heat transportation for higher Darcy factor. The magnetic field utilization obstructs the flow circulation stimulated by the temperature gradient induced buoyancy force.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Green & Sustainable Science & Technology
Ammar M. Abdulateef
Summary: This research aims to enhance energy transfer by using nanofluids, which are compatible with heat exchanger thermal energy storage (HXTES) applications. A triplex tube heat exchanger (TTHX) was designed to receive hot and cold flows from two thermal baths, and the heat transfer efficiency of the nanofluid with different Cu volume concentrations was evaluated.
Article
Engineering, Mechanical
Wenhao Cao, Arif Ullah Khan, S. Saleem, Hajar Abutuqayqah, Safdar Abbas
Summary: The convective heat transfer and fluid flow were studied in a rectangular chamber with corrugated heated rods, taking into account porous media, micropolar fluid, and inclined magnetic field effects. Finite element method was used to solve the fluid flow and heat transfer problems in the rectangular chamber. The results, presented using contour plots and line graphs, showed that increasing the Hartmann number led to higher heat transmission rates, while Lorentz forces resulted in a flattening of the velocity profile. Higher Nusselt numbers and velocity profiles were observed near the heated boundaries.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Kevin Apmann, Ryan Fulmer, Branden Scherer, Sawyer Good, Jake Wohld, Saeid Vafaei
Summary: This study investigates the effects of a connector between two microchannels for the first time. Fe3O4 nanoparticles were introduced to enhance the heat transfer coefficient inside the microchannels, and it was observed that the connector has a significant impact on enhancing the heat transfer coefficient inside the second microchannel.
Article
Multidisciplinary Sciences
Hanifa Hanif, Sharidan Shafie
Summary: This research investigates the use of nanofluids as coolants to improve the cooling process in an electrical power system. The study takes into account the exceptional characteristics of nanofluids and considers the effects of heat radiation, viscous dissipation, and Newtonian heating. The numerical simulations and results obtained using MATLAB software are presented graphically.
SCIENTIFIC REPORTS
(2022)
Article
Thermodynamics
Zahir Shah, M. Sheikholeslami, Ikramullah, Poom Kumam
Summary: The hydrothermal behavior of hybrid nanomaterial migration from a perforated and wavy container is analyzed, taking into account the impacts of buoyancy, Lorentz forces, and medium porosity on fluid motion. The study shows that increasing buoyancy and medium porosity enhance convective flow, while increasing Lorentz forces decreases convective flow strength and raises fluid temperature. The results also demonstrate the dependence of entropy generation on various parameters and derive analytical relations for average Nusselt and Bejan numbers.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Roghayeh Bardool, Ali Bakhtyari, Feridun Esmaeilzadeh, Xiaopo Wang
Summary: This study applies the free-volume model and Esmaeilzadeh-Roshanfekr equation of state to calculate the viscosity of nanofluids and proposes a simple modification to improve the model's performance. The results show that the modified model performs better in terms of accuracy compared to the original model.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Physics, Multidisciplinary
Umar Nazir, Muhammad Sohail, Abha Singh, Sami Muhsen, Ahmed M. M. Galal, El Sayed M. Tag El Din, Syed M. M. Hussain
Summary: This article examines the impact of dispersing nanoparticles in ethylene glycol on its thermal enhancement. The experimental results show that nanoparticles can improve the properties of ethylene glycol, such as oxidation resistance, anti-evaporation, and anti-aging.
FRONTIERS IN PHYSICS
(2022)
Article
Chemistry, Physical
A. G. N. Sofiah, M. Samykano, K. Sudhakar, Zafar Said, A. K. Pandey
Summary: In this study, CuO/PANI nanocomposites-blended in palm oil hybrid nanofluid was prepared via a two-step method and investigated as a potential heat transfer hybrid nanofluid for the first time. The nanocomposites were successfully synthesized and characterized, and the hybrid nanofluids were prepared and stabilized without surfactants. The stability, chemical stability, thermal stability, density, rheology, and viscosity properties of the nanofluids were evaluated. It was found that the nanofluid containing 10 wt% CuO/PANI nanocomposites exhibited the highest viscosity and thermal conductivity properties.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
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
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.