Review
Materials Science, Ceramics
Ghassan Fadhil Smaisim, Doaa Basim Mohammed, Ahmed M. Abdulhadi, Khusniddin Fakhriddinovich Uktamov, Forat H. Alsultany, Samar Emad Izzat, Mohammad Javed Ansari, Hamzah H. Kzar, Moaed E. Al-Gazally, Ehsan Kianfar
Summary: Nanofluids are liquid suspensions of hard nanometer-sized particles suspended in a base fluid. Hybrid nanofluids, which consist of two distinct forms of nanoparticles diffused in base fluids, display strong heat transfer efficiency and have a wide range of thermal applications.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2022)
Article
Thermodynamics
Rashmi Walvekar, Danial Aminin Zairin, Mohammad Khalid, Priyanka Jagadish, Nabisab Mujawar Mubarak, T. C. S. M. Gupta
Summary: This study investigates the stability, thermo-physical properties, and electrical properties of pure transformer oil, palm oil methyl ester, and blend oils suspended with SiO2-graphene nanoparticles. The optimized nanofluid blend showed improved thermal conductivity and lower viscosity for faster heat dissipation and fluid flow. Pure transformer oil exhibited higher breakdown voltage and resistivity compared to the optimized sample with hybrid nanoparticles.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2021)
Article
Thermodynamics
Sayantan Mukherjee, Sayan Jana, Purna Chandra Mishra, Paritosh Chaudhuri, Shanta Chakrabarty
Summary: In this experimental study, convective flow boiling heat transfer using Al2O3/water nanofluid in a horizontal tube was analyzed. The nanofluids exhibited good stability and enhanced thermophysical properties, resulting in a significant increase in heat transfer coefficient, although it also led to an increase in pressure drop. Performance evaluation criteria showed a 94% improvement in overall thermal performance compared to pure water.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Green & Sustainable Science & Technology
Lei Shi, Shuai Zhang, Adeel Arshad, Yanwei Hu, Yurong He, Yuying Yan
Summary: This study utilizes a neural network model to predict the thermophysical properties of magnetic nanofluids, demonstrating its accuracy compared to previous theoretical models and providing a theoretical basis for heat transfer.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Engineering, Chemical
Farshad Farahbod
Summary: Efficiency of drilling fluids in heat transfer plays a crucial role in cooling the drill bit, changing the size of nanoparticles in drilling fluid components can enhance heat transfer rate.
Article
Multidisciplinary Sciences
Adela Svobodova-Sedlackova, Alejandro Calderon, Camila Barreneche, Pablo Gamallo, A. Ines Fernandez
Summary: This study analyzed nanofluids with different concentrations of SiO2 NPs using techniques such as infrared thermography, infrared spectroscopy, and differential scanning calorimetry to understand the mechanism behind the increase in heat capacity. Results showed that the clustering of NPs and ionic exchange processes contribute to the anomalous behavior of the heat capacity in nanofluids.
SCIENTIFIC REPORTS
(2021)
Article
Thermodynamics
Reinaldo R. Souza, Ines M. Goncalves, Raquel O. Rodrigues, Graca Minas, J. M. Miranda, Antonio L. N. Moreira, Rui Lima, Goncalo Coutinho, J. E. Pereira, Ana S. Moita
Summary: NFs are colloidal suspensions that enhance heat transfer capacity of fluids, with applications in various fields such as electronics cooling and renewable energies. Parameters like BF, NPs size, concentration, shape, and fabrication procedures impact the thermal properties of NFs. Models for predicting specific heat, viscosity, thermal conductivity, and density of NFs are listed and evaluated.
APPLIED THERMAL ENGINEERING
(2022)
Article
Multidisciplinary Sciences
Wisut Cham Sa-ard, Derek Fawcett, Chun Che Fung, Peter Chapman, Supriya Rattan, Gerrard Eddy Jai Poinern
Summary: Two types of highly stable 0.1% graphene oxide-based aqueous nanofluids were synthesized and evaluated for their potential application in low-temperature direct absorption solar collectors. The GO-based nanofluid showed a 9.5% enhancement in thermal conductivity at 40 degrees C compared to pure water, while the RGO-based nanofluid exhibited a 9.23% lower value. Both nanofluid types displayed good dispersion stability and photothermal performance after 6 months, making them promising working fluids for solar thermal applications.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Multidisciplinary
Glauco Nobrega, Reinaldo Rodrigues de Souza, Ines M. Goncalves, Ana S. Moita, Joao E. Ribeiro, Rui A. Lima
Summary: This review highlights the recent progress made in the use of nanofluids (NFs) in machining, solar energy, and biomedical engineering, focusing on their thermal and stability properties. NFs play a significant role in optimizing machining processes, thermal management of solar panels, and various biomedical applications. The review also identifies and discusses key parameters that have influenced the use of these fluids in different fields.
APPLIED SCIENCES-BASEL
(2022)
Review
Thermodynamics
Javier P. Vallejo, Jose I. Prado, Luis Lugo
Summary: Research on nanofluids has mainly focused on traditional mono nanofluids and recently received attention on hybrid nanofluids, aiming to enhance performance through the study of mixed nanomaterials. Experimental studies on the heat transfer performance of these two types of nanofluids have not yet conclusively determined which is more promising for heat transfer applications.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Duygu Yilmaz Aydin, Metin Guru
Summary: Nanofluids with better thermo-physical properties compared to conventional fluids are widely used in various systems. Studies on preparation techniques, stability improvement, and thermal performance evaluation are increasing. The use of nanofluids shows potential in enhancing heat transfer properties in thermal systems.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
C. Nwaokocha, M. Momin, S. Giwa, M. Sharifpur, S. M. S. Murshed, J. P. Meyer
Summary: This study experimentally investigated the thermo-convection behavior of binary nanofluids as thermal working fluids and observed the effects of temperature gradient and hybrid nanoparticle proportion on the thermoconvection performance.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2022)
Review
Chemistry, Multidisciplinary
Mudasar Zafar, Hamzah Sakidin, Mikhail Sheremet, Iskandar Dzulkarnain, Roslinda Mohd Nazar, Abida Hussain, Zafar Said, Farkhanda Afzal, Abdullah Al-Yaari, Muhammad Saad Khan, Javed Akbar Khan
Summary: Nanofluids and nanotechnology are crucial for enhancing heat transfer efficiency, as the nanoparticles within them have high thermal conductivity. Previous research has shown the use of nanofluid-filled cavities to increase heat transfer rates for two decades. This review explores various parameters including cavities' significance, nanoparticle concentration and material, inclination angle, and magnetic field effects. Different shapes of cavities offer advantages in multiple applications, with circular microchannel heat exchangers performing best. The use of nanofluids improves thermal performance in all cavities, and further research should focus on different nanoparticle shapes and cavity designs.
Article
Thermodynamics
Tatenda A. Kajau, Bhekie B. Mamba, Nomcebo H. Mthombeni, Machawe M. Motsa
Summary: The development and application of nanofluids in heat transfer systems have been improved, enabling heat engines to operate at lower temperatures and utilize low-grade energy sources more efficiently. CuO and Cu2O nanoparticles were synthesized and used in preparing nanofluids, which were then tested for their vapor pressure generation enhancement in a diaphragm pump.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2022)
Article
Engineering, Chemical
Behnam Habibnezhad Ledari, Majid Sabzpooshani, Morteza Khayat
Summary: The study conducted a comparative experimental investigation on the friction factor and heat transfer of oil-based nanofluids (CuO and Fe3O4 with 0.5%, 1%, and 2% mass concentrations) inside inclined U-tubes. The results showed that using nanoparticles increased the convective heat transfer coefficient, with the best performance observed in 0.5% CuO and 1% Fe3O4 samples.
Article
Chemistry, Physical
Gabriela Huminic, Angel Huminic, Claudiu Fleaca, Florian Dumitrache, Ion Morjan
Summary: The study focuses on the development of new hybrid nanofluids with distinct iron-based and silicon nanophases through experimental analysis of dynamic viscosity at different temperatures and concentrations, leading to the proposal of new correlations. The findings contribute to understanding the mechanisms of viscosity changes and finding preparation methods for long-term stability.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Materials Science, Multidisciplinary
Ion Sandu, Claudiu Teodor Fleaca, Florian Dumitrache, Bogdan Sava, Luliana Urzica, Marius Dumitru
Summary: Coffee ring structures formed by the evaporation of a nanosphere colloidal drop on the flat upper side of a pillar can grow into thick, high-quality colloidal crystals with a torus shape. These microsphere crystals have a lower shape factor compared to those formed in a classical manner, making them easy to detach from the substrate and manipulate. This method could be useful for researchers who use colloidal crystals as sacrificial templates for inverse-opals synthesis.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Chemistry, Physical
Alexandra Sandulescu, Crina Anastasescu, Florica Papa, Monica Raciulete, Anca Vasile, Tanta Spataru, Monica Scarisoreanu, Claudiu Fleaca, Cristian N. Mihailescu, Valentin S. Teodorescu, Nicolae Spataru, Maria Zaharescu, Ioan Balint
Summary: In the light-triggered oxidation of phenol over TiO2 with noble metal loading, supported noble metals act as visible light absorbers, assist in charge separation, and catalyze the production of O-2(-), resulting in mild oxidation products and the mineralization of phenol to CO2 by center dot OH radicals. The presence of supported noble metals enhances the oxidative conversion of phenol through the interplay between center dot OH and O-2(-) production.
Article
Chemistry, Physical
Gabriela Huminic, Angel Huminic, Florian Dumitrache, Claudiu Fleaca, Ion Morjan
Summary: The experimental study investigated the effects of solid surface, concentration, and temperature on dynamic contact angles of water and water based Si-C nanofluid. It was found that the contact angle of nanofluids decreases with increasing temperature and nanoparticles concentration, and the wettability of nanofluids on solid surfaces is better than water. Different solid surfaces exhibit varying degrees of wettability with the Si-C nanofluid, with Cu/Si-C nanofluid showing the best performance.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Review
Chemistry, Multidisciplinary
Iulia Ioana Lungu, Alexandru Mihai Grumezescu, Claudiu Fleaca
Summary: The study of magnetism in materials without partially filled d or f bands has been a topic of much debate in recent years, challenging traditional understanding of magnetism. Various theories have been proposed regarding whether the exhibited ferromagnetic behavior in such materials is caused by sample impurities or intrinsic structural defects. Materials like hexaborides, non-magnetic oxides, and carbon nanostructures have attracted significant interest due to their potential applications.
APPLIED SCIENCES-BASEL
(2021)
Article
Thermodynamics
Angel Huminic, Gabriela Huminic, Claudiu Fleaca, Florian Dumitrache, Ion Morjan
Summary: The experimental results show that the dynamic contact angle decreases as the temperature increases. The wettability of aluminum-FeC nanofluid is better than that of copper-FeC nanofluid and stainless steel-FeC nanofluid, and the average contact angle decreases with the increase of nanofluid concentration.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Marius Chereches, Alexandru Vardaru, Gabriela Huminic, Elena Ionela Chereches, Alina Adriana Minea, Angel Huminic
Summary: Polyethylene glycol is extensively studied as the base for new enhanced materials, and PEG 400 enhanced with nanoparticles may be a new heat transfer fluid. The experiment shows a possible synergy between nanoparticle type and base fluid, but further validation is needed.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Chemistry, Physical
Gabriela Huminic, Angel Huminic
Summary: This study proposes a new working fluid for absorption systems that improves thermal properties and heat transfer characteristics. The results show that by adding nanoparticles to the ionic liquid, the thermal conductivity of the solution is enhanced while the viscosity and specific heat are reduced.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Chemistry, Multidisciplinary
Gabriela Huminic, Angel Huminic
Summary: This study investigates the use of new working fluids NH3/IL+ CNMs solutions as an alternative to conventional working fluids. The results indicate that by adding nanomaterials, the thermal conductivity of the solution increases while its viscosity and specific heat decrease.
Article
Biochemistry & Molecular Biology
Gabriela Huminic, Alexandru Vardaru, Angel Huminic, Claudiu Fleaca, Florian Dumitrache, Ion Morjan
Summary: In this paper, a new hybrid nanofluid consisting of graphene oxide sheets and silicon nanoparticles is proposed for thermal applications. The viscosity of the nanofluid is measured at different temperatures and compared to existing literature. The results indicate that the viscosity increases with a higher mixture ratio of graphene oxide. A new correlation for the viscosity is proposed based on the experimental findings. Lastly, the performance criteria for the nanofluid in thermal applications are analyzed.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Chemistry, Inorganic & Nuclear
E. Goncearenco, I. P. Morjan, E. Dutu, M. Scarisoreanu, C. Fleaca, L. Gavrila-Florescu, F. Dumitrache, A. M. Banici, V. S. Teodorescu, C. Anastasescu, A. Sandulescu, I Balint
Summary: This study prepared W and V co-doped TiO2 nanoparticles using laser pyrolysis technique and chemical impregnation method. The addition of noble metals Pt or Pd improved the photocatalytic properties of the nanoparticles, with W:V:TiO2@Pt material showing better performance in the conversion of CH3OH compared to the reference Degussa P25 sample.
JOURNAL OF SOLID STATE CHEMISTRY
(2022)
Article
Polymer Science
Ion Sandu, Claudiu Teodor Fleaca, Florian Dumitrache, Bogdan Alexandru Sava, Iuliana Urzica, Iulia Antohe, Simona Brajnicov, Marius Dumitru
Summary: Silica and polystyrene spheres with a small size ratio (r = 0.005) were assembled into a binary colloidal crystal through sequential hanging drop self-assembly. The crystal could undergo calcination to transform into a silica-ordered concavity array, which exhibited light Bragg diffraction and shape dependent optical phenomena. Moreover, it could be further transformed into inverse-opal structures. Hierarchical 2D and 3D super-structures with ordered concavities as structural units were successfully fabricated in this study.
Article
Engineering, Multidisciplinary
Alexandru Vardaru, Gabriela Huminic, Angel Huminic, Claudiu Fleaca, Florian Dumitrache, Ion Morjan
Summary: Hybrid nanofluids, specifically the graphene oxide (GO)-silicon (Si)/water hybrid nanofluid, were manufactured and investigated in this paper. The experimental results showed that the thermal conductivity of the hybrid nanofluid increased with both rising temperature and increasing graphene oxide content.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
