Article
Chemistry, Multidisciplinary
Yongfeng Ju, Tiezhu Zhu, Ramin Mashayekhi, Hayder Mohammed, Afrasyab Khan, Pouyan Talebizadehsardari, Wahiba Yaici
Summary: Increasing the number of semi-twisted tapes in a heat exchanger pipe leads to enhancement in heat transfer and friction factor, which is significant for heat exchange using nanofluids.
Article
Thermodynamics
A. Garcia, R. Herrero-Martin, J. Perez-Garcia, J. P. Solano
Summary: This paper presents a new methodology based on a non-dimensional geometry-based parameter to predict the friction coefficient evolution and transitional flow region extension of wire-coil inserts. The experimental validation shows that this methodology is a valuable tool for selecting the most appropriate wire-coil geometry. The case study demonstrates that wire-coil geometry with early transition effect can improve the thermal performance.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Santinath Bairagi, Ranendra Roy, Bijan Kumar Mandal
Summary: This study conducts a numerical investigation on the heat transfer properties of water-based Al2O3 nanofluids flowing through circular tubes, both with and without twisted tape inserts. The results show that twisted tape significantly enhances the heat transfer rate, while the nanofluid alone only provides a modest improvement. The friction factor increases with the nanoparticle volume fraction, but the effect on heat transfer rate is more pronounced. The best thermohydraulic performance is achieved with a 5% volume fraction of nanoparticles and twisted tape inserts.
JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS
(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
Thermodynamics
H. B. Marulasiddeshi, Praveen Kumar Kanti, S. B. Prakash, S. N. Sridhara
Summary: This research investigates the thermohydraulic behavior and thermodynamic irreversibility rate of water-based Al2O3 and Al2O3 + CuO hybrid nanofluid in a circular copper tube under a constant heat flux. The study analyzes the thermophysical characteristics, Nusselt number, entropy generation number, and friction factor of the nanofluids at different concentrations and Reynolds numbers. The findings demonstrate the potential of Al2O3 + CuO hybrid nanofluids as alternative cooling fluids for thermal systems.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
A. Martin Subirana, J. P. Solano, R. Herrero-Martin, A. Garcia, J. Perez-Garcia
Summary: This study investigates the flow and heat transfer in a helical coil under laminar and transitional flow regimes, considering mixed convection conditions. The continuous separation and reattachment of the boundary layer caused by the wire coil, as well as the swirl induced by the helical shape of the insert, are identified as mechanisms for enhancing heat transfer. Simulations in the Reynolds number range 200 < Re < 1500 show the sensitivity of heat transfer to mixed convection, as the flow dynamics is affected by buoyancy forces induced by tube wall heating. The interaction between the secondary swirl flow and buoyancy motion is examined to determine the range where heat transfer may be worsened by the presence of the helical coil. The study considers a helical coil with geometrical characteristics e/D = 0.071 and p/D = 1.5, using water as the working fluid. Experimental validation of friction factor and Nusselt number is also provided.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2023)
Article
Thermodynamics
Amro H. Al-Tohamy, Olatomide G. Fadodun, Amr Kaood
Summary: This paper investigates the turbulent hydrothermal performance of boehmite/water-ethylene glycol nanofluid flowing through a square duct with various coiled-wire inserts. The study examines the effect of Reynolds number, wire geometry, nanoparticle volume ratio, and nanoparticle shapes on hydrodynamic and convective heat transfer performance. The results show that the combination of coiled-wire inserts and nanofluid enhances hydrothermal performance.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Multidisciplinary Sciences
B. Saleh, L. Syam Sundar, Ayman A. Aly, E. Venkata Ramana, K. Sharma, Asif Afzal, Yasser Abdelrhman, Antonio C. M. Sousa
Summary: This study experimentally investigated the thermal efficiency, collector area, weight, embodied energy, and environmental CO2 emissions of Al2O3/water nanofluid flow in a flat-plate solar collector. The results showed that the thermal efficiency of the collector increased with higher particle volume loadings and volume flow rates, while the collector area decreased.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2022)
Article
Thermodynamics
Fatma Oflaz, Orhan Keklikcioglu, Veysel Ozceyhan
Summary: This study explores the thermohydraulic performance of a heat exchanger tube with the combined use of SiO2-water nano-fluids and newly designed conical wire inserts. The experimental results show that the conical wire inserts with a pitch ratio of 0 can achieve the best heat transfer performance under specific conditions.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Abdussamet Subasi, Kasim Erdem
Summary: In this study, a hybrid approach combining MOO and MCDM techniques was used to enhance heat transfer in pipes by evaluating the performance of different nanofluids and inserts. The optimal design parameters were determined using MOO study and TOPSIS method, assisting decision-makers in selecting the best solution among Pareto optimal solutions. The combination of twisted tape and CNT-Fe3O4 nanofluid exhibited the best thermal-hydraulic performance for equal weights of criteria.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Orhan Keklikcioglu, Veysel Ozceyhan
Summary: The experimental results indicate that adding graphene nanoplatelets to water and combining them with different types of conical wire coils can enhance the thermohydraulic performance of the heat exchanger tube. As expected, the use of conical wire coils increases both the heat transfer rate and fluid friction, while the addition of graphene nanoplatelets significantly increases the heat transfer rate and slightly increases the friction factor.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Green & Sustainable Science & Technology
Ravi Kumar, Ankit Kumar Pathak, Manoj Kumar, Anil Kumar Patil
Summary: The study investigates the performance of a sensible heat storage system consisting of concrete with wire coil inserts, which is able to store thermal energy from heated air. The system achieves higher energy efficiency and capacity factor when using wire coil inserts with a pitch to diameter ratio of 0.5.
Article
Physics, Multidisciplinary
S. Mohammadreza Golestanha, Davood Toghraie, Ramin Mashayekhi, Alireza Rahbari
Summary: This study investigates the thermo-hydraulic performance of water-Al2O3 nanofluid flow in an oval tube with different configurations of conical twisted strips. It is found that the NS-5 configuration achieves the highest Nusselt number, indicating enhanced heat transfer performance at the expense of a higher friction factor.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Thermodynamics
Keyvan Ahmadi, Saber Khanmohammadi, Shoaib Khanmohammadi, Mehdi Bahiraei, Quang-Vu Bach
Summary: In this study, a numerical simulation is conducted to improve the thermal performance of a circular pipe using elliptical-cut twisted tape inserts and nanofluid. The results show that the use of elliptical-cut twisted tape and nanofluid can significantly enhance heat transfer and thermal efficiency factor.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
Seyed Shahab Mozafarie, Kourosh Javaherdeh, Omid Ghanbari
Summary: This study indicates that in a circular finned double-pipe heat exchanger, simplifying the design can enhance the heat transfer efficiency of nanofluids, but the thermal performance of non-Newtonian fluids decreases when inserts are used.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Physics, Multidisciplinary
K. Manikandan, N. Vishnu Priya, M. Senthilvelan, R. Sankaranarayanan
Summary: This study investigates matter rogue wave (RW) solutions in both attractive-attractive and repulsive-repulsive two-component Bose-Einstein condensates (BECs), and explores their dynamical properties through various trap potentials.
WAVES IN RANDOM AND COMPLEX MEDIA
(2022)
Article
Chemistry, Physical
C. Yogeswari, T. C. Sabari Girisun, R. Nagalakshmi
Summary: The novel 2-Nitroaniline - Poly (methylmethacrylate) electrospun nanofibers exhibit intensity dependent nonlinear absorption transition, with a decrease in the nonlinear absorption coefficient and switch over in the sign indicating a strengthening of saturable absorption and weakening of two photon absorption. The addition of PMMA alters the band structure and leads to strong green and red emission peaks, with potential application in optical switching and power limiting devices.
CHEMICAL PHYSICS LETTERS
(2022)
Article
Environmental Sciences
G. Antilen Jacob, S. P. Sathiya Prabhakaran, G. Swaminathan, R. Justin Joseyphus
Summary: The research indicates that the addition of FeNi alloy catalyst can enhance the pyrolytic activity and thermal kinetics of mustard biomass, which is crucial for producing biofuels.
Article
Physics, Applied
Kanagaraj Chinnadurai, Baskaran Natesan
Summary: This study predicts the magnetic and half-metallic properties of Cr(3)Z alloys using density functional theory calculations. The results show that only Cr3Sb alloy exhibits half-metallic behavior, while the others behave as typical metallic materials. The total magnetic moment is mainly contributed by Cr atoms in all the Cr(3)Z alloys.
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2022)
Article
Materials Science, Multidisciplinary
B. Karthikeyan, R. Vettumperumal
Summary: This study focused on the optical properties of magnesium orthosilicate (Mg2SiO4) and its composite materials, synthesized through a sol-gel method. Various techniques including PXRD, FT-IR, and UV-vis were used to analyze the structural and optical properties of the samples, revealing information such as crystalline size, absorption coefficients, optical band gap energies, and refractive index. The study also explored the non-linear optical properties of the samples and their potential applications in optical devices.
Article
Chemistry, Inorganic & Nuclear
R. Vettumperumal, N. R. Dhineshbabu, B. Karthikeyan
Summary: The study focused on examining the behavior of moringa oleifera gum, a material that has increased the cultivation of the tree due to its role in reducing global warming. The researchers explored the properties of the gum using various methods and found that it has a crystalline nature, high dielectric constant, and UV shielding efficiency, making it suitable for applications in UV shielding and detection.
PHOSPHORUS SULFUR AND SILICON AND THE RELATED ELEMENTS
(2022)
Article
Materials Science, Textiles
P. Prabhu, A. Balaji, D. Jayabalakrishnan, N. Velmurugan, P. Vimalnathan, B. Karthikeyan, V Balaji, S. Dinesh
Summary: The influence of processing parameters on thrust force and delamination during drilling of GFRP, AFRP, and A/GFRP materials were investigated. Results showed that using appropriate processing parameters (lower feed rate and suitable rotation speed) can reduce delamination and improve drilling quality.
JOURNAL OF NATURAL FIBERS
(2022)
Article
Materials Science, Ceramics
R. Rajesh, N. Giridharan
Summary: This study reveals the energy storage performance and magnetocapacitance effect of polycrystalline BiFeO3 ceramics, and investigates the correlation between electric and magnetic orderings through the arrangement of the crystal structure. The experimental results show that the spontaneous polarization and energy storage capacity of electrically poled BiFeO3 are significantly higher than unpoled BiFeO3.
JOURNAL OF THE AUSTRALIAN CERAMIC SOCIETY
(2022)
Article
Electrochemistry
M. P. Harikrishnan, P. Naveena, N. Baskaran, A. Chandra Bose
Summary: CeNiO3 (CNO) is a promising anode material for supercapacitors due to its stable structure and prolonged cycle life. In this study, CNO nanospheres anchored on a chain-like structure of VS4 (VS) with high sulfur content were successfully synthesized using in situ hydrothermal reaction. The optimized structure of CNO nanospheres on VS showed an enhanced specific capacity compared to pristine CNO and VS. The combination of sulfur and oxide in VS facilitated a diffusion-driven charge storage mechanism, while higher sulfur content enhanced surface-controlled charge storage. Additionally, an asymmetric supercapacitor was fabricated with CNO@VS10 as the positive electrode, demonstrating high specific energy and power. DFT studies were used to support the experimental observations. Moreover, a set of LEDs displaying NML on a printed circuit board (PCB) was lit up using CR2032 coin cells connected in series.
ELECTROCHIMICA ACTA
(2023)
Review
Energy & Fuels
M. P. Harikrishnan, A. Chandra Bose
Summary: VS4, also known as patronite, is a widely studied nanostructured material with high theoretical capacity. Its chain-like structure and interchain spacing provide space for ion insertion/extraction, making it suitable for supercapacitor and battery applications. Scientific reports on VS4 and its nanocomposites have been published recently, and this article summarizes their charge storage properties and discusses challenges and future perspectives.
Article
Electrochemistry
Rengasamy Dhanabal, A. Juliet Christina Mary, Suhash Ranjan Dey, Arumugam Chandra Bose
Summary: Metal oxide-based nanostructures, particularly nickel oxide (NiO)-based nanostructures, show high-performance in electrochemical energy storage devices. Different NiO nanostructures, including nanoplate, nanoflower, nanorod, and nanosheet, have been synthesized using a solution-based hydrothermal method. These nanostructures exhibit specific capacities of 355 C g(-1), 294 C g(-1), 284 C g(-1), and 432 C g(-1) when used as electrodes in a three-electrode system. Additionally, a solid-state asymmetric supercapacitor device (NiO//AC) composed of NiO nanosheet anode and activated carbon cathode achieves a specific capacity of 83 C g(-1), a maximum energy density of 39.49 Wh kg(-1), and a retention rate of 107.9% after 10,000 charge/discharge cycles.
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
(2023)
Article
Chemistry, Physical
I. Ajin, R. Balamurugan, A. Chandra Bose
Summary: In this study, La2NiCrO6 (LNC) double perovskites were successfully synthesized as an efficient supercapacitor electrode material. In a three-electrode system, LNC@Ni-foam showed a specific capacity of 529 C g(-1) (147 mA h g(-1)) at a current density of 1 A g(-1). A device fabricated with LNC@Ni-foam as a positive electrode and activated carbon (AC) AC@Ni-foam as a negative electrode achieved a specific capacity of 227 C g(-1) (63 mA h g(-1)) at 1 A g(-1), and exhibited an energy density of 49.17 W h kg(-1) and a cycle stability of 97% after 10,000 cycles at a current density of 10 A g(-1).
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
K. Anusuyadevi, R. Balamurugan, A. Chandra Bose, S. Velmathi
Summary: This study presents a single-step synthesis of nitrogen and oxygen doped carbon nano-sponges by heating precursors in dimethylsulfoxide. The structure, morphology, and optical properties of the nano-sponges were thoroughly investigated. The nano-sponges exhibited fluorescent sensing capability for 4-nitroaniline and showed potential as a supercapacitor due to their high surface area, porous nature, and functionalities.
MATERIALS TODAY CHEMISTRY
(2023)
Article
Physics, Multidisciplinary
P. Vipin, R. Sankaranarayanan
Summary: The dynamics of a Brownian particle in Morse potential under thermal fluctuations is investigated by numerically integrating the corresponding Langevin equation. The dependence of Kramer's rate on temperature and viscosity of the medium is studied by mean first passage time. An approximate analytical expression for the rate constant is found and it shows a temperature dependent pre-factor for the Arrhenius equation. Numerical simulations are consistent with the analytical approximations.
PRAMANA-JOURNAL OF PHYSICS
(2023)
Article
Spectroscopy
G. Shanmugapriya, B. Karthikeyan, R. Vettumperumal, N. Rajamanickam
Summary: In this study, the molecular parameters of the astrophysically significant diatomic molecule carbon mono-fluoride (CF) were derived using density functional theory and compared with literature values. The results suggest that the calculated vibrational temperature is similar to the temperature favorable for the formation of CF in interstellar medium.
JOURNAL OF APPLIED SPECTROSCOPY
(2022)