Article
Thermodynamics
A. Esmaeilzadeh, N. Nik-Ghazali, H. S. C. Metselaar, M. S. Naghavi, M. Azuddin, S. Iranmanesh
Summary: The experiments investigated the heat transfer characteristics in a sintered wick heat pipe using stable aqueous dispersions of 1-pyrene carboxylic acid (PCA)-functionalized graphene nanofluid. Results showed that thermal conductivity enhancement of nanofluids ranged from 21% to 40% with increasing concentration and temperature. The tilt angle of the heat pipe was found to have a substantial impact on the thermal properties, enhancing thermal performance by 79%. The use of nanofluids reduced heat pipe thermal resistance, with the most significant enhancement in overall heat transfer coefficient achieved at 0.06 mass% by 13.9 kW/K.m(2).
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Albin Joseph, Shijo Thomas
Summary: This paper presents an experimental analysis of the fouling factor and thermal performance of a carbon-dot nanofluid on a double-pipe heat exchanger. The study reveals that the flow rate of the fluid has a significant influence on the heat transfer coefficient, while the temperature has less significance on the performance.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Thermodynamics
Abdonnabi Goosheneshin, Abdolmohammad Alamdari, Payam Setoodeh
Summary: In the current experimental study, it is shown that deploying a cylindrical microchannel heat sink with sinusoidally wavy fins results in superior efficiency for cooling the equipment compared to straight fins. The use of alumina nanoparticles in nanofluids further enhances the heat transfer coefficient in both cylindrical microchannels with straight and sinusoidal fins, with increasing nanofluid concentration corresponding to an increase in Nusselt number.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
Hadise Mehrarad, Mohammad Reza Sarmasti Emami, Komeil Afsari
Summary: In recent years, researchers have focused on technologies that can improve the performance of heat transfer devices, such as plate heat exchangers, in order to cope with the increasing energy consumption and the need for optimization. One solution is the use of nanoparticles in common fluids. However, there has been insufficient attention given to the application of multi-walled carbon nanotubes (MWCNT) in plate heat exchangers. This study investigates the thermal performance and flow characteristics of a brazed plate heat exchanger using MWCNT nanoparticles in a water/ethylene glycol cooling fluid. The results show that the nanofluid concentration of 0.05 wt% exhibits the highest stability, and at a hot fluid temperature of 55°C and a cold fluid volume flow rate of 23.4 l/min, the convection heat transfer coefficient and heat transfer rate increase by 20.97% and 34.3% compared to the base fluid. The Nusselt number, pressure drop, friction factor, and pumping power also increase with higher hot fluid temperature and cold fluid volume flow rate, with the nanofluid exhibiting increases of 94.45%, 11.25%, 12.87%, and 11.36% respectively compared to the base fluid. This study demonstrates better performance at high temperatures compared to similar studies.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Environmental Sciences
Noushin Azimy, Mohammad Reza Saffarian, Aminreza Noghrehabadi
Summary: This research aims to increase the heat transfer efficiency of flat-plate solar collectors by designing the collector pipe in a zigzag shape. Through a 3D coupled investigation and analysis of fly ash-Cu/water hybrid nanofluids, the study found that the zigzag pipe design improves thermal efficiency compared to conventional straight pipes. Additionally, increasing mass flow rate, temperature, and irradiation leads to higher Nusselt numbers.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Nuclear Science & Technology
Xiang Zhou, Chen Zeng, Yinxi Song, Ming Jiao, Feixi Zhang, Maolong Liu
Summary: This study experimentally investigates the heat transfer and resistance characteristics of a microchannel heat exchanger with zigzag flow channels. By analyzing the influence of various experimental parameters, correlations of heat transfer coefficient and flow resistance factor are established. The research results can be used to validate the CFD simulation and design of this type of heat exchanger.
PROGRESS IN NUCLEAR ENERGY
(2022)
Article
Thermodynamics
Asif Afzal, Md Tariqul Islam, Abdul Razak Kaladgi, A. Muthu Manokar, Olusegun D. Samuel, M. A. Mujtaba, Manzoore Elahi M. Soudagar, H. Fayaz, Hafiz Muhammad Ali
Summary: The study investigates the thermal performance of a helical tube three-fluid heat exchanger using graphene/water nanofluids, showing an increase in overall heat transfer coefficient with higher fluid flow rates and variation in effectiveness due to different fluid flow speeds. Comparison with a double-pipe helical tube heat exchanger reveals significant differences in Nusselt numbers and correlations. Semiempirical correlations proposed for the triple-fluid helical tube heat exchanger align well with experimental results and are useful for multiple fluid flows and thermal communications in heat exchangers.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
Shivani S. Chawhan, Divya P. Barai, Bharat A. Bhanvase
Summary: Ag-doped TiO2 hybrid nanoparticles based nanofluid with high thermal conductivity was synthesized for heat transfer in minichannel heat exchanger. The overall heat transfer coefficient increased with the concentration of nanofluid, and the pressure drop and friction factor were lower compared to water.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2021)
Article
Thermodynamics
Reza Mansourian, Seyedeh Maryam Mousavi, Maryam Mohammadpoor, Samad Sabbaghi
Summary: The study investigated the convective heat transfer behavior of CaCO3/TiO2/CuO nanocomposite dispersions in water/ethylene glycol, showing significant enhancement in convective heat transfer using nanofluids, particularly in the entrance region. The Nusselt number and friction factor were higher with nanocomposite concentration, and pressure drop increased initially before decreasing. Heat transfer coefficient was higher in rough pipe-lines compared to smooth ones, with the greatest thermal performance factor achieved at 0.1 vol. % and Reynolds number of 4800.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2021)
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
Thermodynamics
Mohammad Sharif Zarei, Amir Taghavi Khalil Abad, Maboud Hekmatifar, Davood Toghraie
Summary: The main purpose of this study is to investigate the wavy wall effect caused by a sinusoidal function in a two-dimensional natural convection cavity with Cu-Water nanofluid. Through numerical simulation and statistical analysis, it was found that the volume fraction of nanoparticles plays the most important role in heat transfer, with a significant improvement in heat transfer efficiency as the volume fraction increases, while the wall wavelength has a minor effect on heat transfer.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Engineering, Multidisciplinary
Ibrahim A. Fetuga, Olabode T. Olakoyejo, Sogo M. Abolarin, Adekunle O. Adelaja, Omotayo Oluwatusin, Joshua K. Gbegudu, Adrian U. Onwuegbusi, Oluwarotimi T. Shitta-Bey, Josua P. Meyer, Antonio Marcos de Oliveira Siqueira
Summary: This study numerically evaluates the thermohydraulic performance of a circular tube, which consists of semi-alternated twisted tape with cylindrical baffles and ternary nanofluid as a working fluid. The results show that, when the pitch ratio of the twisted tape decreases from 5.77 to 1.77, there is a significant improvement in the Nusselt number, pumping power, and thermal performance factor. Similarly, with an increase in the width ratio and thickness ratio, there is an increase in the Nusselt number, pressure drop, and thermal performance factor.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Thermodynamics
Soheyl Sharifi, Mohammad Reza Aligoodarz, Alireza Rahbari
Summary: This study presents the thermohydraulic performance of Al2O3-water nanofluid in single-phase and two-phase subcooled flow boiling in a horizontal copper tube. The effects of different parameters on the heat transfer and pressure drop are analyzed.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Thermodynamics
Mohammad Abbaszadeh, Mohammad Hossein Montazeri, Mojtaba Mirzaie
Summary: This study proposes a novel implementation of twisted tape in sinusoidal wavy-walled tubes to enhance heat transfer rate without compromising thermal efficiency. The study numerically investigates the effect of different geometrical configurations on heat transfer improvement and performance factor. The results suggest that implementing twisted tape in wavy tubes significantly increases heat transfer rate and performance factor.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2023)
Article
Mathematics, Applied
Essam M. Elsaid, Mohamed S. Abdel-Wahed
Summary: The study of the boundary layer is crucial in explaining the behavior of surfaces under the influence of flow and thermal forces. It has applications in engineering and medical fields. This work focuses on investigating the boundary layer around a three-dimensional sinusoidal pipe filled with a hybrid nanofluid, analyzing the effects of different nanoparticles and magnetic fields on cooling rates.
ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
(2023)
Article
Engineering, Mechanical
Mohammad Hemmat Esfe, Erfan Mohammadnejad Ardeshiri, Davood Toghraie
Summary: The viscosity of MWCNT (20%)-ZnO(80%)/SAE50 hybrid nanofluid (HNF) is investigated using statistical approach (RSM) and compared with other models. The study is conducted under laboratory conditions with varying temperature, volume fraction, and shear rate. The aim of this research is to identify the best model function and determine the optimal lubrication mode in cold and hot environments. The Quartic model shows the highest significance and predictive power among all the models analyzed.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Mohammad Hemmat Esfe, Saeed Esfandeh, Fatemeh Amoozadkhalili, Davood Toghraie
Summary: This study utilizes artificial neural network (ANN) to forecast the viscosity of nanofluids. The multilayer perceptron (MLP) ANN algorithm is used, with temperature, volume fraction of nanoparticles, and shear rate as inputs, and viscosity as output. The optimal sample is selected from various ANN samples, resulting in an accurate predictive model.
ARABIAN JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Mohammad Hemmat Esfe, S. Ali Eftekhari, As'ad Alizadeh, Saman Aminian, Maboud Hekmatifar, Davood Toghraie
Summary: Due to poor thermal conductivity, fluid limitation exists in various industries, leading to the improvement of base fluid properties as a new method. Nanofluids are produced by adding metal nanoparticles and multi-walled carbon nanotubes (MWCNT) in nanofluid research. Mathematical models, especially artificial neural networks (ANNs), are used to investigate the effect of various parameters on nanofluid properties and have replaced traditional statistical methods.
ARABIAN JOURNAL OF CHEMISTRY
(2023)
Article
Nuclear Science & Technology
Mohammad Hemmat Esfe, Davood Toghraie, Erfan Mohammadnejad Ardeshiri
Summary: In this report, the rheological behavior of MWCNT (50%)-MgO (50%)/SAE40 hybrid nanofluid (HNF) is investigated experimentally/statistically/numerically. The HNF is found to exhibit pseudo-plastic non-Newtonian behavior, and mathematical models are developed to estimate laboratory data and simulate flow in a branch pipe. The results provide valuable insights into understanding and predicting the rheological behavior of this specific nanofluid.
ANNALS OF NUCLEAR ENERGY
(2023)
Article
Environmental Sciences
Hongying Lv, Wenxin Zhang, Maryam Hosseini, Majid Riahi Samani, Davood Toghraie
Summary: In this study, the removal of hexavalent chromium from aqueous environments was investigated using polyaniline composites with natural waste materials. The polyaniline/walnut shell charcoal/PEG composite showed the highest chromium removal efficiency of 79.22%. It also had a larger specific surface area, leading to an increase in its removal efficiency. The optimum pH and contact time for this composite were found to be 2 and 30 minutes, respectively. The maximum calculated adsorption capacity was 500 mg/g.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Materials Science, Multidisciplinary
Xun Cheng, Shichuan Chang, Bujuan Zhang, Xianqin Luo, Hui Rao, Roozbeh Sabetvand, Davood Toghraie
Summary: Early detection of cancer is crucial, and this study investigates the atomic behaviors of cancer cells to better understand and diagnose them. By conducting molecular dynamics simulations, the stability of cancer cells at different initial pressures is predicted. The results suggest that increasing the initial pressure can enhance the recovery velocity of cancer cells.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Engineering, Mechanical
Mohammad Hemmat Esfe, Soheyl Alidust, Majid Motallebi, Davood Toghraie
Summary: The viscosity of 10W40-based hybrid nanofluid was modeled using response surface methodology (RSM). Four transfer functions were evaluated, and the square root transfer function showed the best performance.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Mohammad Hemmat Esfe, Seyed Naser Hosseini Tamrabad, Hossein Hatami, Soheyl Alidoust, Davood Toghraie
Summary: The present study predicts the dynamic viscosity of SiO2 (60%) -MWCNT (40%) hybrid nanofluid in SAE40 oil as base fluid by comparing various RSM models. The Quartic model was selected as the optimal model due to its acceptable accuracy in predicting the viscosity values of the nanofluid. The findings provide insights into the rheological behavior of the hybrid nanofluid and SAE40 engine oil in cold environmental conditions.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
M. R. Morovvati, B. Mollaei-Dariani, A. Lalehpour, D. Toghraie
Summary: This study aims to grow carbon nanotubes on aluminum substrates using TCVD to allow for cladding of aluminum sheets. FEM was used to evaluate damage progression and fracture initiation in AL-CNT composites. RVE models were studied to determine the most effective carbon nanotube weight percentage as a contender to reinforce the aluminum matrix. Experimental results showed that AL-5 wt.% CNT had the best physical properties.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Jiangbo Tang, A. Ahmadi, As'ad Alizadeh, Reza Abedinzadeh, Azher M. Abed, Ghassan Fadhil Smaisim, Salema K. Hadrawi, Navid Nasajpour-Esfahani, Davood Toghraie
Summary: Metal matrix composites with nano-particle reinforcement have unique mechanical and thermal properties, making them suitable for various structural and thermal applications. In this study, molecular dynamics simulation was used to model and investigate the effects of reinforcing nano-particles on the hardness of aluminium-based composites. The results showed an increase in hardness with the addition of nanoparticles, and the analysis of the radial distribution function confirmed the proper balance of the simulated atomic systems. These findings have practical implications for the use of aluminium-based composites in industrial, engineering, and medical fields.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Thermodynamics
Mohammad Esmaiel Sayadzadeh, Majid Riahi Samani, Davood Toghraie, Sobhan Emami, Seyed Ali Eftekhari
Summary: This study evaluates the emission characteristics of pollutants in conventional and MILD combustion and performs chemical and physical exergy analyses. The results show that the overall exergy efficiency improves and NOx emissions decrease significantly in MILD combustion compared to conventional combustion. Chemical exergy is higher than physical exergy initially and then decreases due to chemical reactions, while physical exergy increases with temperature. The total exergy stabilizes at a certain distance from the burner.
Article
Chemistry, Physical
Wei Zhu, Farahnaz Saberi, S. Mohammad Sajadi, Navid Nasajpour-Esfahani, Maboud Hekmatifar, As'ad Alizadeh, D. Toghraie, Roozbeh Sabetvand
Summary: This study investigated the effect of graphene nanosheets (GNS) on the hydraulic fracturing process using molecular dynamics simulation. The results showed that adding GNS to the mixture can optimize the hydraulic fracturing process and reduce operating costs.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Physical
Xiaowei Chen, A. Ghorbani, Long Quan, D. Toghraie
Summary: Sports injuries are a common problem for athletes, ranging from minor sprains to severe fractures and concussions. Microfluidic devices have shown promise in sports medicine by analyzing small samples of sweat, blood, or urine to provide real-time data on an athlete's physiological status. This information can optimize training, prevent injuries, and also contribute to the development of diagnostic and therapeutic methods for cancer and other diseases.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Materials Science, Multidisciplinary
Kavoos Razmjooee, Azin Rashidy Ahmady, Naghmeh Arabzadeh, Sara Ahmadi, Saeed Saber-Samandari, Davood Toghraie
Summary: In this study, a novel triple-network Gelatin/Polyacrylamide/Carboxymethyl chitosan hydrogel was synthesized using an innovative aqueous-based method. The hydrogel consisted of physically crosslinked gelatin as the first network, and covalently crosslinked Polyacrylamide and Carboxymethyl chitosan as the second and third networks, respectively. The physical and mechanical properties of the hydrogels could be tuned by adjusting the concentration of the crosslinking agent. The synthesized hydrogels exhibited desirable characteristics such as tailor-made porosity, good mechanical strength, high swelling ratio, and high thermal stability. Cell viability assays showed that the hydrogels were non-toxic and supported adequate cell viability. Therefore, these hydrogels show great promise for various medical applications such as tissue engineering scaffolds, delivery systems, and wound dressings.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Yuan Zhou, E. Abdali, Ahmadreza Shamshiri, Mohammed Al-Bahrani, Naiser Sadoon, S. Ali Eftekhari, Furqan S. Hashim, Navid Nasajpour-Esfahani, Abdullah Jalel Khazel, Laith Yassen Qassem, Davood Toghraie
Summary: This study investigates the mechanical characteristics of graphene nanosheets using the molecular dynamics method. The simulations show that the fracture lengths of nanosheets with zig-zag and armchair structures are different, and increasing temperature and pressure lead to longer crack lengths. The type of nanosheet structure affects the mechanical properties, with nanosheets with armchair edges exhibiting better performance. Furthermore, the presence of boron, nitrogen, or a combination of these impurities improves the mechanical properties and resistance to crack growth in graphene nanosheets.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2023)
