Article
Physics, Applied
T. Hayat, W. A. Khan, Aqsa, M. Waqas, S. Z. Abbas, M. Y. Malik, A. S. Alqahtani
Summary: This study analyzed the magnetohydrodynamic effects on micro hybrid nanofluids over a stretched surface, showing that micropolar hybrid nanofluid models have a higher heat transfer rate compared to nanofluids.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2021)
Article
Thermodynamics
Kartik Srivastava, Rashmi Rekha Sahoo
Summary: The current theoretical study compares the performance of a two-stage variable leg-shaped thermoelectric generator using different coolant materials. The study investigates the effects of flow parameters on the fluids and performance parameters of the generator. The results show that MXene/Water nanofluid outperforms water in terms of power output and second law efficiency.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Chemistry, Multidisciplinary
Nikita Gupta, Shipra Mital Gupta, S. K. Sharma
Summary: In recent years, there has been significant research on heat transfer applications of CNT nanofluid due to its high thermal conductivity compared to conventional fluids. However, the hydrophobic nature of CNT poses a challenge for dispersion in polar basefluid. The use of surfactants can help disperse CNT, but they have some disadvantages such as foam formation, stickiness, and viscosity enhancement. This study presents an alternative method by preparing Cu-CNT hybrid nanoparticles in-situ and dispersing them in double distilled water without surfactant, resulting in a stable nanofluid with good dispersibility and high thermal conductivity.
Article
Nanoscience & Nanotechnology
Nikita Gupta, Shipra Mital Gupta, S. K. Sharma
Summary: Researchers synthesized Cu-CNT hybrid nanoparticles by in situ synthesis of Cu nanoparticles in the presence of CNT nanoparticles and dispersed them in double-distilled water without surfactant to obtain stable nanofluid. The analysis showed that the samples were highly stable with a maximum stability of over 170 days, and the nanofluid exhibited higher thermal conductivity compared to the base fluid.
MICROFLUIDICS AND NANOFLUIDICS
(2021)
Article
Green & Sustainable Science & Technology
Fatih Selimefendigil, Hakan F. Oztop
Summary: The performance of a thermoelectric generator installed in a channel flow with double porous cylinders was analyzed using the finite element method. An optimization algorithm was used to determine the optimum size and permeability of the porous objects, resulting in higher power generation compared to a non-object channel configuration. The study found that both lower permeability and larger porous object sizes increased the power output of the thermoelectric generator.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Chemistry, Physical
Yuyan Qiao, Yanqiu Pan, Shiwen Du, Tingting Wu, Yucheng Cao, Guifa Long, Wenjun Fan, Fuxiang Zhang
Summary: The study introduces a novel NiIrx/CNT/CFP nanostructure electrode for efficient oxygen evolution reaction (OER) in different pH conditions, showing low overpotential demands and superior performance. Furthermore, the research reveals the significance of cooperative effects between noble metals and non-noble metals for OER.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Physics, Multidisciplinary
Tahar Tayebi, Hakan F. Oztop, Ali J. Chamkha
Summary: This study numerically solves the natural convective flow and heat exchange problems within a concentric annulus under a magnetic field, and delineates the various factors and their interrelationships affecting the thermo-hydrodynamic behavior and heat exchange rate.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Metallurgy & Metallurgical Engineering
Kaouther Ghachem, Lioua Kolsi, Samia Larguech, Ghada Alnemer
Summary: This study investigates the effects of CNT-water nanofluids on double diffusive convection in a triangular pyramid solar still through 3D numerical simulations. The results show that buoyancy ratio plays a crucial role in optimizing heat and mass transfer, and the use of CNT has a positive impact on the performance of the solar still.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2021)
Article
Mathematics
Khalid B. B. Saleem, Mohamed Omri, Walid Aich, Badr M. M. Alshammari, Hatem Rmili, Lioua Kolsi
Summary: This paper focuses on the effect of a rotating magnetic field on natural convective flow of CNT/Water nanofluid in a corrugated square cavity with differential heating on its sidewalls and perfectly insulated upper and lower boundaries. The study aims to highlight the impact of various parameters, such as Hartman number, frequency of rotation, Rayleigh number, nanoparticles volume fraction, and corrugation aspect ratio, on flow behavior and thermal transport characteristics. The governing equations are solved using the finite element technique. Results show that thermal energy exchange is improved with increasing Rayleigh number and nanoparticles loading, while it is weakened with higher Ha due to Lorentz force opposing buoyancy. Increasing corrugation aspect ratio leads to stagnant fluid zones and a reduction in heat transfer rate.
Article
Green & Sustainable Science & Technology
Ede Mehta Wardhana, Hidemi Mutsuda, Yoshikazu Tanaka, Takuji Nakashima, Taiga Kanehira, Shuhei Maeda, Masaaki Yamauchi
Summary: This study proposed a multi-layered TEG model and combined it with a PEG to form a PEG-TEG hybrid harvester, demonstrating improved output voltage by modifying key factors. The experiment showed that the multi-layered TEG can enhance electrical energy output in a smaller device, with vibration amplitude affecting electrical performance and key factors playing a significant role in energy generation.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Chemistry, Multidisciplinary
Abdullah Alhendal, Randa Abd Almoaeen, Mohamed Rashad, Ali Husain, Fouzi Mouffouk, Zahoor Ahmad
Summary: This work presents a method for preparing an analytical microextraction sorbent using a sol-gel hybrid composite. The sorbent showed excellent repeatability, reproducibility, low LODs, and good affinity towards PAHs. It also demonstrated enhanced extraction capability compared to commercially available counterparts.
Article
Thermodynamics
Najiyah Safwa Khashi'ie, Norihan Md Arifin, Ioan Pop, Roslinda Nazar
Summary: The impact and capability of Cu-Al2O3/water nanoliquid as the heat transfer fluid during melting heat transfer on a moving surface are numerically investigated. The results show that the use of hybrid nanofluid assists boundary layer separation, but also increases the heat transfer rate.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
Mohammad Hemmat Esfe, Soheyl Alidoust, Seyed Naser Hosseini Tamrabad, Davood Toghraie, Hossein Hatami
Summary: Scientists have studied the ther-mophysical characteristics and thermal conductivity of nanofluids. This research evaluates and compares two new nanofluids using experimental and statistical methods, and introduces one of them to the industry. The findings show that hybrid nanofluid A has a higher thermal conductivity enhancement and is more cost-effective compared to hybrid nanofluid B.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Multidisciplinary Sciences
Shaik Mohammad Muzahid Basha, Md. Ezaz Ahammed, D. Arumuga Perumal, Ajay Kumar Yadav
Summary: This study focuses on using nanofluid composed of carbon nanotubes (CNT) and water in a bifurcated microchannel to mitigate hotspots in a microprocessor. Numerical analysis is conducted to determine the optimal configuration of the bifurcated microchannel and investigate its thermal-hydraulic performance. It is found that a two-stage bifurcated microchannel with 5% CNT-water nanofluid shows a significant improvement in average Nusselt number and thermal resistance compared to a microchannel with only water. The study also examines the influence of flow rate and the position of hotspots in the microchannel.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
David Reber, Oleg Borodin, Maximilian Becker, Daniel Rentsch, Johannes Helmut Thienenkamp, Rabeb Grissa, Wengao Zhao, Abdessalem Aribia, Gunther Brunklaus, Corsin Battaglia, Ruben-Simon Kuehnel
Summary: The water-in-salt concept has improved the stability of aqueous electrolytes, and the addition of succinonitrile as a cosolvent opens up a large design space for optimizing the properties of electrolytes. This allows for the development of high-performance, nonflammable batteries.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Energy & Fuels
Amin Shahsavar, Majid Jafari, Ighball Baniasad Askari, Fatih Selimefendigil
Summary: In this study, the influence of the number of ribs on the laminar forced convection flow of a silver/water-ethylene glycol nano-fluid in a rifled tube was investigated using the two-phase mixture model. The results showed that increasing the number of ribs was beneficial from the perspective of the first-law performance, but undesirable from the perspective of the second-law performance. It was also found that the rifled tube consistently outperformed the plain tube in terms of hydrothermal performance.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2023)
Article
Energy & Fuels
Ali Bahadir Ceylan, Levent Aydin, Mustafa Nil, Hayati Mamur, Ilker Polatoglu, Hasan Sozen
Summary: This study presents a new hybrid modeling optimization approach for determining the best installation location of a biogas power plant. Through a case study in Manisa province, Turkey, it is found that this approach yields more acceptable results. By conducting calculations and optimizations, it is concluded that establishing a biogas plant in the Golmarmara, Salihli, and Ahmetli area in Manisa would be more appropriate.
BIOMASS CONVERSION AND BIOREFINERY
(2023)
Article
Engineering, Chemical
Fatih Selimefendigil, Hakan F. Oztop
Summary: In this study, the cooling performance of nanofluid jet impingement with single and multiple jets is analyzed with the impact of using double porous layers with finite element method (FEM). The presence of the double porous layers significantly affects the convective heat transfer performance, with the variation in permeability having the largest impact on the performance.
CHEMICAL ENGINEERING COMMUNICATIONS
(2022)
Article
Thermodynamics
Hakan Cosanay, Hakan F. Oztop, Fatih Selimefendigil
Summary: This study performs computational analysis on the steady flow and heat transfer due to a slot nanojet impingement onto a heated moving body, considering the unsteady flow effects and interactions of multiple impinging jets. The finite volume method was used for numerical simulation, studying the influence of various parameters on convective heat transfer characteristics in the transient regime. The findings suggest that the flow field and heat transfer become complicated due to the interaction of multiple impinging jets with the movement of the hot body, with higher heat transfer rates achieved at higher Reynolds numbers and minimal impact from nanoparticle inclusion on flow friction.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2022)
Article
Thermodynamics
Fatih Selimefendigil, Hakan F. Oztop
Summary: This study investigates nanoliquid impingement heat transfer with the installation of a phase change material (PCM) in a radial system. The results show that using PCM improves thermal performance, while the combination of nanoliquid and PCM achieves the best performance. Additionally, the height of the PCM layer and plate spacing have an impact on heat transfer performance.
JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS
(2022)
Article
Engineering, Multidisciplinary
Fatih Selimefendigil, Hakan F. Oztop, Lioua Kolsi, Mohamed Omri
Summary: The performance of a thermoelectric system in a chaotic channel is influenced by the type of fluid and Re number, resulting in varying power generation effects under different conditions. Nanofluids show potential in enhancing the power of the thermoelectric system, especially in channels containing shear thinning fluids.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Energy & Fuels
Fatih Selimefendigil, Ceylin Sirin
Summary: The study investigates the impact of utilizing nano-enhanced thermal energy storage unit on the performance of a greenhouse dryer, comparing different types of greenhouse dryers. Results show that utilizing nano-enhanced modification significantly reduces drying time and improves energy efficiency.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Thermodynamics
Fatih Selimefendigil, Hakan F. Oztop
Summary: This study analyzes the effects of using a magnetic field and packed bed phase change material (PCM) system in a 3D cavity with ventilation ports on performance improvements during hybrid nanoliquid convection. Numerical simulations are conducted considering different inlet port locations and various parameters, showing that using PCM can enhance the average Nusselt number while the inlet port location has significant impacts on phase change dynamics and transition time.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Engineering, Mechanical
Fatih Selimefendigil, Hakan F. Oztop
Summary: The combined use of an elastic fin and magnetic field accelerates the phase change process dynamics, reducing the phase completion time and providing excellent control in a PCM-packed cylindrical reactor. The effects of different parameters, such as Reynolds number and magnetic field strength, on the phase change dynamics were explored, showing significant improvements in process acceleration and efficiency.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Thermodynamics
Seda Ozcan Coban, Fatih Selimefendigil, Hakan Oztop
Summary: The purpose of this paper is to investigate the coupled heat and mass transport of different shaped porous moist objects in a rectangular channel under convective drying. Numerical simulations were conducted for cylindrical, triangular, and rectangular shaped food products under turbulent conditions. Findings showed that changing air temperature and velocity have significant effects on drying, and the location of objects in the channel also plays a crucial role in the drying process. This study provides valuable insights for optimizing drying performance in industry.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2022)
Article
Thermodynamics
Fatih Selimefendigil, Seda Ozcan Coban, Hakan F. Oztop
Summary: This study proposes a procedure for optimizing the convective drying performance of multi porous moist objects in a three dimensional channel. Utilizing numerical simulation and optimization algorithm, the research highlights the impact of spacing between objects on convective drying performance, with flow recirculation and flow reversal affecting thermal gradient variations.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Energy & Fuels
Fatih Selimefendigil, Ceylin Sirin, Hakan F. Oztop
Summary: By modifying the greenhouse drying system with solar absorber and thermally insulated north wall, as well as coating the designed north wall with graphene nanoplatelet-embedded black paint, drying time can be significantly reduced and efficiency improved.
Review
Materials Science, Multidisciplinary
Mohammad Ruhul Amin Bhuiyan, Hayati Mamur, Omer Faruk Dilmac, Mehmet Ali Ustuner
Summary: Environmental pollution, global warming, and increasing energy demands are urgent challenges. To achieve the national policy target of transitioning to a zero or low carbon economy, scientists and engineers are developing cleaner, alternative, and sustainable energy production technologies. Thermoelectric generators (TEGs) show potential in this transition, but currently have limitations in efficiency, cost, and self-heating. Therefore, this study examines the current state of TEGs and identifies future research directions to support the green technology transition.
NANOMATERIALS AND ENERGY
(2022)
Article
Computer Science, Artificial Intelligence
Mehmet Ali Ustuner, Hayati Mamur, Sezai Taskin
Summary: A new TEG Simulink/MATLAB model has been developed in this study, considering the change of Seebeck coefficient and internal resistance with temperature difference, and comparing with commercially available TEG data, showing more realistic results.
TURKISH JOURNAL OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCES
(2022)
Article
Multidisciplinary Sciences
Mohammad Ruhul Amin Bhuiyan, Hayati Mamur, Mehmet Ali Ustuner, Omer Faruk Dilmac
Summary: With the increase of industrialization, the waste heat emitted by industrial machines also increases, leading to a decrease in energy efficiency and contributing to global climate change. Governments are implementing incentive policies to address this issue, while scientists and engineers are working towards cleaner and more efficient energy solutions. Thermoelectric generators (TEGs) play a significant role in recovering a certain amount of waste heat and contributing to energy efficiency and sustainable energy production. However, the efficiency and cost of TEGs remain as challenges. Academicians and engineers are continuously researching to overcome these obstacles and aim to convert waste heat into electrical energy in the future.
GAZI UNIVERSITY JOURNAL OF SCIENCE
(2022)
