Article
Chemistry, Multidisciplinary
Muhammad Ishaq, Amjad Ali, Muhammad Amjad, Khalid Saifullah Syed, Zafar Iqbal
Summary: This article introduces an innovative diamond-shaped design of extended fins for double-pipe heat exchangers, with optimal configurations recommended based on various performance measures. The h-adaptive finite element method is utilized to solve the governing equations, providing insights into the enhanced heat transfer with the suggested fin placement.
APPLIED SCIENCES-BASEL
(2021)
Article
Thermodynamics
M. Hedeshi, A. Jalali, A. Arabkoohsar, A. Amiri Delouei
Summary: This paper experimentally investigates the simultaneous impacts of using nanofluid and ultrasonic vibrations in a double-pipe heat exchanger. The effects of adding nanoparticles and applying ultrasonic vibrations are studied using water-based Al2O3 nanofluid. The results show that both nanoparticles and ultrasonic vibrations have a positive effect on the heat exchanger's performance, especially at higher inlet hot fluid temperatures and higher nanofluid concentrations. The effectiveness-NTU analysis demonstrates that using nanofluid and ultrasonic-excited nanofluid can significantly increase the thermal system's efficiency.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Thermodynamics
Amin Amiri Delouei, Meysam Atashafrooz, Hasan Sajjadi, Sajjad Karimnejad
Summary: This study experimentally investigates the effects of nanofluid concentration on forced convective heat transfer in an ultrasonic vibrating finned tube heat exchanger. The results reveal that increasing nanofluid concentration can enhance the effect of ultrasonic vibration, while the increase of ambient temperature and passing air velocity reduces the ultrasonic effect.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Mohammed Flyyih Hasan, Merdin Danismaz, Bassim Mohammed Majel
Summary: This study numerically investigates heat transfer enhancement in a double pipe heat exchanger with an extended surface on the inner tube's outer surface and the addition of Alumina nanofluid. Water and hot de-ionized water flow through the annuli at varying mass flow rates and Reynolds numbers, while hot de-ionized water flows through the inner tube. Simulations are conducted with different volume concentrations of Al2O3 nanoparticles. The results show that the use of a finned tube heat exchanger improves heat transfer, with an improvement ratio between 2.3 and 3.1. The convective heat transfer coefficient increases with higher volume concentration and Reynolds number, and a volume concentration of 5% leads to a 20% increase in the heat transfer coefficient and a 4.7% increase in thermal conductivity.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Do Huu-Quan, Ali Mohammad Rostami, Mozafar Shokri Rad, Mohsen Izadi, Ahmad Hajjar, Qingang Xiong
Summary: This study focused on the convective heat transfer characteristics inside novel double-pipe heat exchangers with flat inner pipes, and found that the effects of inner pipe geometry heavily depend on the Reynolds number. Using flat inner pipes with small aspect ratio is beneficial for overall heat transfer at low Reynolds numbers, while circular inner pipes outperform at high Reynolds numbers.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Bahram Jalili, Narges Aghaee, Payam Jalili, Davood Domiri Ganji
Summary: This study investigates the convection heat transfer in a countercurrent double-tube heat exchanger with various fins, comparing the performance with simple and rectangular-finned geometries. The results show that the water-aluminum oxide nanofluid has a better convection heat transfer coefficient than water-titanium dioxide and pure water. Heat exchangers with rectangular and curved fins have significantly better efficiency than the heat exchanger without a fin.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Ahmet Selim Dalkilic, Hatice Mercan, Guven Ozcelik, Somchai Wongwises
Summary: The study determined the number, geometry and dimensions of the fins using algorithms, conducted operational condition optimization and cost analysis, and investigated the effects of different types of nanofluids on heat transfer performance and cost.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Thermodynamics
V. Kannadhasan, A. Senthil Kumar, J. Vairamuthu, R. Nagarajan
Summary: The study showed that CuO nanoparticles significantly reduced the cold-water inlet temperature and increased the heat transfer rate. Simulation results confirmed that lower concentrations of CuO nanoparticles had less impact compared to higher concentrations. The proposed model can be applied to various heat exchanger designs.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
Omar Rafae Alomar, Karam Hashim Mohammed, Obed M. Ali, Omar Mohammed Ali
Summary: This study investigates the evaporation process in an annular porous heat exchanger using Cu/distilled water nano-fluid. The use of Cu/distilled water greatly affects heat diffusivity and alters the locations of phase change. The addition of Cu particles to water decreases the fluid temperature, making nano-fluid a safety factor in heat exchanger applications.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Multidisciplinary Sciences
Mahdi Amini, Mohammad Reza Tavakoli, Iman Chitsaz
Summary: This study investigates heat transfer and pressure drop in wavy-walled tubes filled with porous media under local thermal equilibrium (LTE) conditions. Effective parameters such as wave amplitude, Darcy number, and particle diameter of porous media are investigated based on Nusselt number, friction factor, and performance evaluation criteria (PEC). The results show that the addition of porous material affects the recirculation vortexes, increases the local Nusselt number, and the variation in heat transfer and pressure drop are related to the Darcy number. The reduction in Darcy number increases the interaction between the porous material and flow, and the PEC number decreases as shear stress increases in the convergent section. Reducing the size of porous media particles results in streamline conformity and no reverse flow. The maximum PEC number in this study increases to 1.364, indicating potential for affordable energy supply and improvement in energy efficiency with new ideas.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
Review
Chemistry, Physical
Stephan Pierre Louis, Svetlana Ushak, Yanio Milian, Magdalena Nems, Artur Nems
Summary: This review discusses the impact of nanoparticles on nanofluid properties, including factors such as concentration, size, and shape. High thermal conductivity nanoparticles can improve the heat transfer coefficient, and metallic oxide nanoparticles show up to 30% enhancement. Additionally, nanoparticle size and shape affect the viscosity and density of the nanofluid.
Article
Thermodynamics
Wandong Bai, Wei Chen, Chang Zeng, Ge Wu, Xiaoming Chai
Summary: This study investigates the heat transfer and fluid flow characteristics of annular heat exchangers, as well as the influence of assembly clearance and eccentricity on heat transfer and temperature distribution. The results show that the annular heat exchanger with high fins has higher heat transfer coefficient and friction factor, and a filling medium with greater thermal conductivity is recommended.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Thermodynamics
Xiuzhen Li, Lin Wang, Rong Feng, Zhanwei Wang, Shijie Liu, Dongsheng Zhu
Summary: The study investigated the shell side heat transport enhancement characteristics of double tube heat exchangers with twisted oval tubes and circular tubes, finding that reducing twist pitch length and increasing inner tube aspect ratio can significantly improve comprehensive heat transport performance, with the best performance observed in the case with the largest inner tube aspect ratio and the smallest twist pitch length.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Gang Wang, Yonghui Li, Tieliu Jiang, Zeshao Chen
Summary: This paper presents a numerical study on the heat transfer performance of U-shaped double-pipe heat exchanger for the concentrated solar power system. The effects of mass flow rate, temperature, and pressure of inlet super-critical CO2 are evaluated. The results show that centrifugal force enhances the heat transfer performance by causing temperature and flow velocity distribution divergences in the elbow part of the double-pipe.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Heuijun Seok, Changho Han, Dongchan Lee, Yongchan Kim
Summary: This study measured the heat transfer characteristics of fin-and-tube heat exchangers with different coatings, including uncoated, hydrophilic, hydrophobic, and carbon nanotube coatings, under dry and wet conditions. The performance of the carbon nanotube-coated heat exchanger was found to be the best in terms of heat transfer and frictional pressure drop among the tested heat exchangers. The unique microscopic surface structure of the carbon nanotube coating increased the heat transfer coefficient, while the superlubricity decreased the frictional pressure drop.
APPLIED THERMAL ENGINEERING
(2023)
Article
Engineering, Mechanical
Mohammad Hemmat Esfe, Davood Toghraie, Fatemeh Amoozadkhalili
Summary: This study investigates the viscosity (mu nf) of MWCNT-TiO2(10:90)/SAE40 nanofluid (NF) using an artificial neural network (ANN). The results show that ANN can accurately estimate the viscosity and is more time and cost-effective compared to repetitive experiments.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Mohammad Hemmat Esfe, Mahmoud Kiannejad Amiri, Mohammad Reza Sarmasti Emami, Davood Toghraie
Summary: In this paper, the rheological behavior of MWCNT-MgO (30:70)/SAE50 hybrid nanofluid is experimentally studied. The effects of temperature, volume fraction of nanoparticles, and shear rate on viscosity are investigated. The results show that the hybrid nanofluid exhibits both viscosity reduction and enhancement under different conditions. An empirical correlation for predicting the relative viscosity of the nanofluid is proposed and shows good agreement with experimental data.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Chemistry, Physical
Zhihui Liu, Kejun Zhu, Azher M. Abed, Davood Toghraie
Summary: By simulating the reactions, the performance of catalysts in catalytic combustion can be improved, reducing the release of harmful gases. In this study, the catalytic combustion process of air-methane was simulated in a helical microchannel using Palladium (Pd) as the catalyst. The results showed that adding Pd catalyst improved the thermal performance of the simulated structure and increased the combustion efficiency. Increasing the initial pressure reduced the heat flux and thermal conductivity.
MOLECULAR CATALYSIS
(2023)
Article
Engineering, Multidisciplinary
Mohammad Hemmat Esfe, Davood Toghraie
Summary: This study simulates the effects of wind velocity on the performance of passive single-slope solar stills in Khuzestan Province, Iran. The results indicate that a rise in the wind velocity decreases the freshwater production rate, and Ramhormoz, Dehdez, and Izeh are found to be optimal regions for deploying solar stills based on wind velocity.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Engineering, Multidisciplinary
Mohammad Hemmat Esfe, Mohammad Hassan Kamyab, Erfan Mohammadnejad Ardeshiri, Davood Toghraie
Summary: This study investigates the rheological behavior of a specific type of hybrid nanofluid under different temperature and laboratory conditions, indicating its non-Newtonian nature. The research highlights the unique viscosity behavior of the hybrid nanofluid compared to the base oil at specific temperatures and solid volume fractions. The experimental data is predicted accurately using response surface methodology, resulting in a nonlinear relationship between temperature, solid volume fraction, and shear rate.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Biology
Huanlei Wang, Azher M. Abed, Anahita Piranfar, Ghassan Fadhil Smaisim, Salema K. Hadrawi, Hussein Zekri, Davood Toghraie, Maboud Hekmatifar, As'ad Alizadeh
Summary: The impact of porosity and the number of cancer cells on the atomic behavior of cancer cells during hematogenous spread was investigated using molecular dynamics simulation. It was found that increasing porosity and increasing number of cancer cells led to changes in cancer cell structure and affected their stability. The gyration radius, interaction energy, and interaction force of the samples increased with increasing porosity, while decreased with increasing number of cancer cells. Decreasing the gyration radius can improve the strength and stability of the simulated samples.
COMPUTERS IN BIOLOGY AND MEDICINE
(2023)
Article
Engineering, Multidisciplinary
Navid Habibollahi, Ali Abdollahi, S. Mohammad Sajadi, Davood Toghraie, Sobhan Emami, Mohamad Shahgholi, Mustafa Inc
Summary: This study used MD simulations to investigate the thermal and combustion behavior of coated aluminum hydride nanoparticles in an oxygenated medium. The system's behavior was studied in the presence of two coatings, ethanol and nickel atomic, by analyzing temperature changes, potential energy changes, penetrated oxygen, heat flux changes, and radial distribution functions. The results showed that the combustion process occurred faster with the ethanol coating than the nickel coating, as evidenced by higher heat flux and oxygen penetration. Increasing the percentage of ethanol coating to 12% further enhanced the combustion process and increased the number of infiltrated oxygen atoms.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2023)
Article
Engineering, Chemical
Meng Xia Wang, Behnam Almasi, Zainab Ali Bu Sinnah, Hasan Sh. Majdi, Farag M. A. Altalbawy, Davood Toghraie, Ibrahem Waleed, Rahman S. Zabibah, Usama S. Altimari, Yun Xiang Zhang
Summary: This study investigates the thermal conductivities of Ag-CuO-tungsten oxide/water ternary hybrid nanofluids with different mixing ratios, as well as other mono and hybrid nanofluids. The results show that increasing temperature and volume fraction of nanoparticles both increase the thermal conductivity. The Ag/water nanofluids with a volume fraction of 0.4% and temperature of 50℃ exhibit the highest thermal conductivity. A mathematical model is proposed to estimate the thermal conductivity of Ag-CuO-tungsten oxide/water ternary hybrid nanofluids.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2023)
Article
Engineering, Chemical
Ashkan Ghafouri, Davood Toghraie
Summary: This study evaluates the thermal conductivity of a new mixture of hybrid nanofluids composed of SiC and ZnO nanoparticles in the base fluid of ethylene glycol. The results show that the thermal conductivity enhancement is maximized at the highest temperature and volume fraction, as well as the smallest nanoparticle size. A new multivariate correlation is proposed, which accurately predicts the thermal conductivity based on temperature, nanoparticle size, and volume fraction. The importance of the parameters is found to be in the order of volume fraction > temperature > nanoparticle size.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2023)
Article
Mechanics
Samaneh Soleymani, Parham Memarzadeh, Davood Toghraie
Summary: The present study investigates the sound transmission loss through the air-filled rectangular double-walled cross-ply fiber metal laminated (FML) nanoplates under different boundary conditions using nonlocal strain gradient theory and third-order shear deformation theory. The accuracy and precision of the developed solution are evaluated by comparing with existing data. The effects of various parameters on the sound transmission loss are examined, including boundary conditions, nonlocal and strain gradient parameters, lay-ups, incident angles, and acoustic cavity depth.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Review
Materials Science, Multidisciplinary
Vahid Monfared, Hamid Reza Bakhsheshi-Rad, Mahmood Razzaghi, D. Toghraie, Maboud Hekmatifar, Filippo Berto
Summary: This article provides a brief review of the creep behavior of nanocomposites-based materials in recent years. Investigating the time-dependent plastic deformation of nanocomposites is crucial in modern sciences. The study of creep is important for applications under high temperature and high stresses, such as turbine blades, spaceships, shuttles, and nozzle guide vanes. Additionally, the article presents a detailed review of the creep behavior of metal-based nanocomposites, particularly magnesium-based ones, and suggests the use of nanoparticle encapsulation to improve their creep resistance.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Green & Sustainable Science & Technology
Mohammad Hemmat Esfe, Soheyl Alidust, Mohammad Hosseini, Davood Toghraie, Vahid Vaisi, Hossein Hatami
Summary: Qom province in Iran suffers from drought and water shortage. Recent efforts have improved access to safe drinking water for people in both cities and villages in the province. This research focuses on the performance evaluation of a double-slope solar still with a semi-circular basin in Qom province, specifically investigating the effects of different glass angles on freshwater production rate. The study found that an increase in slope angle leads to higher production rate but lower fresh water production per unit volume.
ENVIRONMENT DEVELOPMENT AND SUSTAINABILITY
(2023)
Article
Automation & Control Systems
Xiaofei Cheng, Sara Hakem Al-Khafaji, Mohammad Hashemian, Mariem Ahmed, S. Ali Eftekhari, Ali Ihsan Alanssari, Nabaa Muhammad Diaa, Manal Morad Karim, Davood Toghraie, Ahmed Hussien Alawadi
Summary: In this study, the natural frequency of a clamped-clamped functionally graded porous (FGP) nanobeam is predicted by considering different material distribution patterns in the thickness direction. The governing equations of the nanobeam are derived based on third-order shear deformation beam theory, nonlocal strain gradient theory (NSGT), and surface effects. Artificial neural network (ANN) is employed to analyze the impact of various parameters on the fundamental frequency of FGP nanobeam. The results show that factors such as temperature gradient, nonlocal parameter, and material length scale have significant influence on the natural frequency.
ENGINEERING APPLICATIONS OF ARTIFICIAL INTELLIGENCE
(2023)
Article
Engineering, Mechanical
Davood Toghraie, Seyed Naser Hosseini Tamrabad, Soheyl Alidoust, Hossein Hatami
Summary: The performance of hybrid nanofluid (HNF) based on SAE40 oil was investigated using response surface methodology (RSM) in this study. Various statistical analyses were conducted to evaluate different modeling functions, and the quartic model was found to have the highest accuracy in presenting the properties of HNF. The optimal viscosity mode of HNF for lubrication in a cold environment was suggested as 212.360 MPa.sec.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Acoustics
Zhiming Liu, Ashkan Bahadoran, As'ad Alizadeh, Nafiseh Emami, Tariq J. Al-Musaw, Ahmed Hussien Radie Alawadi, Aseel M. Aljeboree, Mahmoud Shamsborhan, Iman Najafipour, Seyed Erfan Mousavi, Milad Mosallanezhad, Davood Toghraie
Summary: Water pollution management, reduction, and elimination are crucial challenges in current times that put the lives of millions at risk. The increased use of antibiotics, like azithromycin, due to the spread of the coronavirus in December 2019, has led to their presence in surface waters. A ZIF-8/zeolite composite was synthesized using the sonochemical method and its efficacy in adsorption was studied through various parameters. The composite showed promising adsorption capacity, spontaneous and endothermic adsorption process, and successful removal of the drug in multiple cycles.
ULTRASONICS SONOCHEMISTRY
(2023)
