Article
Thermodynamics
Mahdi Tabatabaei Malazi, Kenan Kaya, Ahmet Selim Dalkilic
Summary: This paper investigates the hydraulic and thermal performances of a three-dimensional rectangular microchannel with circular pin-fins. Laminar flow with Reynolds values between 50 and 150 was considered, and a total of 20 cases were studied. The results show that the increase in Reynolds number and decrease in fin spacing lead to an increase in Nusselt number and a decrease in average outlet temperature. The pressure drop is influenced by Reynolds number and the number of fins. Comparing microchannels with different fin spacing, the one with l/d = 2 demonstrates higher average outlet temperature, pressure drop, and Nusselt number for Re = 150.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Xing-ping Tang, Huan-ling Liu, Li-si Wei, Chuan-geng Tang, Xiao-dong Shao, Han Shen, Gongnan Xie
Summary: In this study, bi-objective optimization design of mini-channels is implemented to obtain single-layer mini-channel heat sinks (SL-MHSs), which are then used as upper and lower layers to assemble double-layer mini channel heat sinks (DL-MHSs). Numerical results show that the new DL-MHSs can significantly reduce the maximum temperature, increase the Nusselt number, and decrease the total thermal resistance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Mechanics
Oussama Mebarki, Mohamed Abdelouahab, Renee Gatignol
Summary: This paper numerically investigates the influence of the tangential momentum accommodation coefficient a(v) on nitrogen gas flow through a microchannel. The results obtained using the finite element method with slip boundary conditions and COMSOL Multiphysics software are in good agreement with analytical solutions and DSMC results. Comparisons with experimental data show comparable results. The study demonstrates that COMSOL is faster than the DSMC method and decreasing the tangential momentum accommodation coefficient a(v) increases gas velocity and velocity jump near walls.
EUROPEAN JOURNAL OF MECHANICS B-FLUIDS
(2023)
Article
Thermodynamics
Krishanu Kumar, Pankaj Kumar
Summary: A three-dimensional numerical simulation was conducted to study fluid flow and heat transfer characteristics in a rectangular microchannel heat sink with arc grooves. Results show that adding grooves can enhance heat transfer in the microchannel but may increase the Poiseuille number; groove depth affects the performance of the microchannel at low Reynolds numbers, but has no significant effect on performance enhancement at high Reynolds numbers; groove configuration also plays a major role in enhancing the performance of the microchannel.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Engineering, Multidisciplinary
Kai Tang, Mohammad Amin Masoumi, Hamid Rajabi, Seyed Alireza Rozati, Omid Ali Akbari, Farnaz Montazerifar, Davood Toghraie, Mohammad Khalili
Summary: This paper presents a numerical simulation study of graphene nanoplatelet (GNP) - sodium dodecylbenzene sulfonate (SDBS) - water nanofluid. The study indicates that higher Reynolds numbers lead to increased convective heat transfer coefficients, decreased temperature gradients, and increased influence of cooling fluid temperature in the warm areas near the solid wall. Furthermore, higher Reynolds numbers also result in larger development lengths and decreased outlet section temperatures.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Thermodynamics
Kitti Nilpueng, Tanachon Chomamuang, Mehrdad Mesgarpour, Omid Mahian, Somchai Wongwises
Summary: This study proposes a plate heat exchanger partially filled with metal foam and investigates the effects of mass flux, foam groove width, and pore density on heat transfer coefficient and pressure drop. The results show that reducing groove width and increasing pore density lead to higher heat transfer coefficient and pressure drop.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Amit Kumar, Akshayveer, Ajeet Pratap Singh, O. P. Singh
Summary: This paper investigates a new curved design of a counter flow double-pass solar air heater with arched baffles placed in the second duct. The introduction of arched baffles accelerates the flow near the absorber and facilitates the formation of large secondary vortices, resulting in enhanced thermal and hydraulic performance. The study also develops two regression correlations for predicting the thermo-hydraulic performance based on geometric and flow parameters.
Article
Thermodynamics
Easwaran N. Krishnan, Hadi Ramin, A. Guruabalan, Carey J. Simonson
Summary: This paper experimentally investigates the heat transfer and pressure drop characteristics of triangular-shaped cross-corrugated flow passages and provides correlations for the average Nusselt number and friction factor, which will be useful for manufactures and designers in developing high-performance heat exchangers.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Chemistry, Physical
Dorsa Sadat Rabizadeh, Majid Abbasalizadeh
Summary: This study aims to investigate the acting mechanism of superhydrophobic surfaces and the factors affecting their performance and efficiency in a three-dimensional flow field. The hydrodynamic performance of a conventional microchannel is numerically assessed with smooth walls and superhydrophobic surfaces at different flow rates. The results show that superhydrophobic surfaces slightly increase the pressure drop in the microchannel, but the increase is not significant. The overall acting mechanism of superhydrophobic surfaces in microchannels is determined by factors such as vortices, periodicity of cavities, and pressure difference.
SURFACES AND INTERFACES
(2022)
Article
Thermodynamics
Liangbin Su, Boshu He, Xiangcheng Wu, Feng Hong
Summary: In this paper, the analytical solutions of fully developed slip flow and heat transfer in elliptical microchannels under the H1 boundary condition with velocity slip and temperature jump are obtained. The momentum and energy equations are solved using the separation of variables method, and the coefficient of the velocity profile is calculated using the binomial series twice. A new model is deduced to predict the Poiseuille number, and the closed-form solution of the Nusselt number is derived as a benchmark for other approaches.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Raad Mohammed Kadhim Ali, Sajida Lafta Ghashim
Summary: This study numerically investigated forced convection heat transfer in a metal foam pipe under uniform heat flux. Water was used as the fluid medium and copper metal foam was used as the test sample. The results showed that partially filling the pipe with metal foam enhanced overall heat transfer, while completely filling the pipe increased flow resistance.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Balaga Ravikiran, Koona Ramji, Tunuguntla Subrahmanyam
Summary: This study investigates the thermal performance of a combination of twisted tapes, perforated twisted tapes, and wire coils in a circular tube with water as the working fluid under turbulent flow conditions. The results show that these combined effects can significantly enhance the convective heat transfer coefficient and friction factor by mechanisms such as reversed flow, swirling flow, and impinging flow, ultimately improving the thermal performance of the circular tube.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Engineering, Multidisciplinary
Hassnia Hajji, Lioua Kolsi, Kaouther Ghachem, Chemseddine Maatki, Ahmed Kadhim Hussein, Mohamed Naceur Borjini
Summary: This study presents two and three-dimensional numerical simulations of flow through sudden expansion and contraction microchannels. Results show the appearance of a separate vortex in the corner after sudden expansion for low Reynolds numbers, with the vortex separation length increasing for high Reynolds numbers. The three-dimensional character of flow is more pronounced for higher Reynolds numbers.
ALEXANDRIA ENGINEERING JOURNAL
(2021)
Article
Thermodynamics
B. Mallick
Summary: A theoretical investigation was conducted on electrokinetic flow and heat transfer in a rotating microchannel, considering the effects of electromagnetism and viscous dissipation. The study showed reduced hydrodynamic boundary layers and precipitous behavior in the EDL region of the microchannel at high speeds. The Hall parameter was found to decrease fluidic temperature for small Hartmann numbers and increase it for larger Hartmann numbers. Analysis on the Nusselt number's asymptotic behavior was done for a wide range of Brinkman number and Joule heating parameter.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Debanjan Banerjee, Sumit Kumar Mehta, Sukumar Pati, Pankaj Biswas
Summary: The study demonstrates that considering the surface potential dependent on interfacial slip has a significant impact on thermal transport phenomenon in electrokinetic flows, allowing for the decoupling of interfacial slip and zeta potential. This consideration results in more accurate velocity and temperature profiles as well as Nusselt numbers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Automation & Control Systems
J. S. Xia, Mohamad Khaje Khabaz, Indrajit Patra, Imran Khalid, Jose Ricardo Nunez Alvarez, Alireza Rahmanian, S. Ali Eftekhari, Davood Toghraie
Summary: This paper uses an Artificial Neural Network (ANN) to investigate the influence of rolling parameters on the rolling force, rolling power, and slip of tandem cold rolling. Real data collected from a practical tandem rolling line is used to train and test the network. The best topology of the ANN is determined, and the results show accurate prediction of the cold rolling parameters considered in this study.
Article
Engineering, Multidisciplinary
Saied Ehsanpour, Majid Riahi Samani, Davood Toghraie
Summary: In this study, eggshell/poly pyrrole composites were used to remove chromium (VI) from water. The experimental factors included contact time, pH of the solution, adsorbent dosage, and adsorption isotherms. The results showed that the composites had a favorable effect on chromium removal, especially when prepared with 2g/L Poly Ethylene glycol in a mixture of water and ethanol solvents. The optimum removal time was 30 minutes, and the highest removal percentage was observed at pH 5. The adsorption process followed Langmuir and Freundlich isotherms, and the maximum chromium adsorption capacity was 175.5 mg/g.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Nuclear Science & Technology
Aissa Abderrahmane, Abed Mourad, Sahnoun Mohammed, Ghassan Fadhil Smaisim, Davood Toghraie, Aimad Koulali, Kamel Guedri, Obai Younis
Summary: This study investigates the buoyancy-driven flow of a hybrid nanofluid in a cubical cavity in the presence of a magnetic field. The numerical results demonstrate that the geometrical parameters, non-Newtonian properties, and magnetic field have significant effects on the heat exchange in the cavity.
ANNALS OF NUCLEAR ENERGY
(2023)
Article
Chemistry, Physical
Ashkan Bahadoran, Massimiliano Galluzzi, Basim Al-Qargholi, Mohammad Hosein Sabzalian, Farag M. A. Altalbawy, Ibrahem Waleed, Salema K. Hadrawi, Ali Abdul Kadhim Ruhaima, Wael dheaa Kadhim, Davood Toghraie
Summary: Air pollution is a major cause of death worldwide, and reducing pollution for clean air has gained attention. This study investigates the effect of the number of graphene nano-pores on the separation of SiO2 from H2O vapor in the presence of an electric field. The results show that increasing the number of graphene nano-pores increases the passage of water molecules, while the electric field prevents the passage of SiO2 nanoparticles, suggesting potential applications for efficient air purification and monitoring.
Article
Construction & Building Technology
Mohammadreza Baghoolizadeh, Mohammad Rostamzadeh-Renani, Reza Rostamzadeh-Renani, Davood Toghraie
Summary: Because the building sector consumes a large amount of energy, providing effective methods is crucial. Windows play a significant role in buildings as they provide natural light. Improper window design and shading can lead to overheating, increased energy consumption, and discomfort for occupants. This paper presents a new approach for optimizing the architectural specifications and control parameters of a smart shadow curtain, resulting in reduced energy consumption and improved thermal and visual comfort.
ENERGY AND BUILDINGS
(2023)
Article
Chemistry, Physical
Qibing Yu, Ameer A. Alameri, As'ad Alizadeh, Maboud Hekmatifar, Mohsin O. AL-Khafaji, Kianoush Ramezani Shabolaghi, Nafis Ahmad, A. M. Alshehri, Navid Nassajpour-Esfahani, Davood Toghraie, Salema K. Hadrawi
Summary: This study investigated the thermal properties of water-copper nanofluids with or without surfactant molecules in a rectangular nanochannel using molecular dynamics simulation. The results showed that decreasing the wall temperature and increasing the size of copper nanoparticles led to a decrease in thermal conductivity and an increase in heat flux. Therefore, these findings are significant for enhancing the efficiency of thermal industries.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Engineering, Mechanical
Mohammad Hemmat Esfe, Reza Esmaily, Mohamad Khaje Khabaz, As'ad Alizadeh, Mostafa Pirmoradian, Alireza Rahmanian, Davood Toghraie
Summary: In this study, an integrated version is proposed to enhance the dynamic viscosity of MWCNT-Al2O3 (40:60)/Oil 5W50 hybrid nanofluid. The relationship between energy consumption and key parameters such as temperatures, solid volume fractions, and shear rates is established. ANNs are used to develop a data analysis model for predicting the dynamic viscosity of the hybrid nanofluid. The study finds that the highest dynamic viscosity values are observed at temperatures below 5 degrees C, and the dynamic viscosity decreases with increasing shear rates.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Computer Science, Artificial Intelligence
Mohammad Hemmat Esfe, Davood Toghraie, Fatemeh Amoozadkhalili, Soheyl Alidoust
Summary: In this study, the viscosity of MWCNT-CuO (10-90)/Oil 10W40 nano-lubricant is modeled by artificial neural network (ANN) using experimental data. The accuracy of the predicted data by ANN is verified through mean square error (MSE), regression coefficient, and margin of deviation (MOD) analysis.
EGYPTIAN INFORMATICS JOURNAL
(2023)
Article
Thermodynamics
Mohammad Hemmat Esfe, Soheyl Alidoust, Davood Toghraie
Summary: This research aims to find an optimal nanofluid for industrial applications by comparing two water-based nanofluids. The first nanofluid showed a higher thermal conductivity enhancement of 37.10% compared to the second nanofluid, which only had a 16.20% increase.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Automation & Control Systems
Xiaohong Dai, Hamid Taheri Andani, As'ad Alizadeh, Azher M. Abed, Ghassan Fadhil Smaisim, Salema K. Hadrawi, Maryam Karimi, Mahmoud Shamsborhan, D. Toghraie
Summary: This research studies the effect of volume fraction, shear rate, and temperature on the dynamic viscosity and torque of SiO2 nanoparticles/ethylene glycol nanofluid using an artificial neural network. The Gaussian Process Regression model with Matern covariance function provides the best results in predicting the rheological properties. The correlation results show high accuracy and power in predicting the dynamic viscosity and torque.
ENGINEERING APPLICATIONS OF ARTIFICIAL INTELLIGENCE
(2023)
Article
Chemistry, Multidisciplinary
Asad Alizadeh, Khidhair Jasim Mohammed, Ghassan Fadhil Smaisim, Salema K. Hadrawi, Hussein Zekri, Hamid Taheri Andani, Navid Nasajpour-Esfahani, Davood Toghraie
Summary: The study predicted the thermal conductivity (knf) of ZnO-TiO2 (50% - 50%)/ Ethylene Glycol hybrid nanofluid using Artificial Neural Networks (ANNs). The nanofluid was prepared at different volume fractions (u) of nanoparticles (u = 0.001 to 0.035) and temperatures (T = 25 to 50 degrees C). The study introduced an algorithm to determine the optimal number of neurons in the hidden layer and used a surface fitting method for knf prediction. The results showed that ANN method outperformed the fitting method in terms of knf prediction, with better MAE and correlation coefficient.
JOURNAL OF SAUDI CHEMICAL SOCIETY
(2023)
Article
Energy & Fuels
Huanlei Wang, Duaa Abdul Rida Musa, Nafis Ahmad, Farag M. A. Altalbawy, Nawras Ali Salman, Waleed Mohammed Khazaal, Noor Abd Alkhudhur Salman, Munther Abosaooda, Navid Nasajpour-Esfahani, Maboud Hekmatifar, Davood Toghraie
Summary: This study explores the use of phase change materials (PCMs) in thermal energy storage (TES) systems for renewable energy. The study focuses on the use of paraffin as PCM and copper oxide nanoparticles in a porous carbon matrix. Molecular dynamics simulation is used to study the phase transition process and the effects of atomic porosity and initial pressure on thermal performance.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Chemistry, Multidisciplinary
Mohammad Hemmat Esfe, Soheyl Alidoust, Davood Toghraie
Summary: This study aims to improve the performance of industrial equipment by preparing and examining a special hybrid nanofluid. The results show that temperature and solid volume fraction have a direct impact on thermal conductivity enhancement. The experiment provides a very accurate correlation relationship and the maximum deviation for the studied THNF is only 0.95%.
KOREAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Abed Mourad, Abderrahmane Aissa, Azher M. Abed, Davood Toghraie, Omid Ali Akbari, Kamel Guedri, Obai Younis, Riadh Marzouki
Summary: This work numerically investigates the MHD natural convection and entropy generation characteristics of water-based hybrid nanofluid in a porous annulus. The influence of parameters such as nanoparticle volume fraction, Rayleigh number, Hartman number, Darcy number, and the position of the Koch snowflake on the flow and heat transfer is examined. Applying a Lorentz force affects the flow velocity and facilitates fluid circulation in the cavity.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Entomology
Amirhosein Kazemiyan Jahromi, Ali Esehaghbeygi, S. Mohammad Sajadi, Ali Nikbakht, Washington da Silva, Bahram Sharifnabi, D. Toghraie
Summary: In this study, the effect of cold plasma treatment on controlling gray mold in cut roses was evaluated. The results showed that cold plasma irradiation effectively suppressed gray mold growth without affecting the quality indices of rose petals.
JOURNAL OF STORED PRODUCTS RESEARCH
(2023)
