Article
Thermodynamics
Pouya Barnoon, Davood Toghraie, Arash Karimipour
Summary: This paper investigates the heat transfer rate and fluid flow in an enclosure with rotating circular obstacles, using Fe3O4/water nanofluid to simulate the effects of magnetism. The results show that the different temperature cases and directions of the circular obstacles play a crucial role in flow and heat transfer.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Thermodynamics
Ali Mohammad Ranjbar, Zeinab Pouransari, Majid Siavashi
Summary: This study investigated the turbulent forced convection heat transfer of air in the presence of porous pin fins for cooling thermal parts of devices. Five fin structures, two different fin arrangements, and three various Darcy numbers were examined to analyze the effects of these parameters on the heat sink performance. It was concluded that the decreasing-aligned pin fin configuration with the highest Darcy number provided the best performance among the studied cases.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Rahul Ray, Aurovinda Mohanty, Pandab Patro, Kartik Chandra Tripathy
Summary: This study conducts a performance analysis of branched and interrupted fin heat sinks using numerical simulations to explore the possibility of enhancing heat transfer efficiency. The design that places the secondary fins symmetrically and at the farthest position from the base plate shows the best heat dissipation performance.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Guolong Li, Jin Wang, Hongxing Zheng, Gongnan Xie, Bengt Sunden
Summary: This study investigates the convective heat transfer enhancement of Fe3O4-water nanofluid by introducing carbon nanotubes and applying a magnetic field. The results show significant improvement in heat transfer performance by adding carbon nanotubes to the nanofluid and subjecting it to a magnetic field under certain experimental conditions.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Energy & Fuels
Dan Zheng, Jiawang Yang, Jin Wang, Stephan Kabelac, Bengt Sunden
Summary: This paper experimentally investigated the effect of various magnetic fields on the performance of a plate heat exchanger filled with ferrofluids. It was found that with the proper arrangement of magnets, both thermal performance and pressure drop of the heat exchanger can be improved.
Article
Thermodynamics
Djamel Sahel, Lahcene Bellahcene, Aissa Yousfi, Abdussamet Subasi
Summary: The study investigated the hydrothermal performance of a heat sink with hemispherical pin fins under fully turbulent flow conditions and optimized the fin configuration. Through the perforation technique, the hydrothermal performance of the heat sink was enhanced significantly.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Engineering, Mechanical
Long Zeng, Daxiang Deng, Ningbo Zhong, Guisen Zheng
Summary: A unique microchannel heat sink design with inline and staggered open-ring pin fins was developed for high heat flux devices. The open-ring pin fins induced flow separations and convergences, leading to enhanced heat transfer performance. The staggered configuration showed slightly better heat transfer performance than the inline configuration, making it more favorable for heat dissipation in high heat flux devices.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Thermodynamics
Hamid Kazemi Moghadam, Saeed Samadzadeh Baghbani, Houman Babazadeh
Summary: Ferrofluids are a type of colloidal systems known as smart materials, with physical properties that adaptively change with magnetic strength, and must be applied for improving efficiency. In the study, thermal performance of a type of ferrofluid with viscosity correlation dependence on temperature, magnetic field, and volume fraction was analyzed.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Chemistry, Multidisciplinary
Yun-Seok Choi, Youn-Jea Kim
Summary: The study analyzed the heat transfer performance of a fin-tube heat exchanger using ferrofluid as a coolant under external magnetic fields, observing changes in the thermal boundary layer and formation of vortices that activate thermal diffusion, enhancing heat transfer efficiency.
APPLIED SCIENCES-BASEL
(2021)
Article
Thermodynamics
Sheng-Wei Chang, Ali Sadeghianjahromi, Wen-Jenn Sheu, Chi-Chuan Wang
Summary: 3D numerical simulations were conducted to investigate the thermofluids characteristics of oblique fin heat sinks under natural convection. The study identified critical parameters affecting performance, proposed an optimum heat sink configuration, and introduced a novel symmetrical oblique fin design. Experimental verification confirmed that the proposed oblique fin heat sink offers over 3°C reduction in maximum temperature compared to continuous fin heat sinks.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Physics, Applied
Mohammed N. Ajour, Muhyaddin J. H. Rawa, Ahmad H. Milyani, Meicheng Li
Summary: Using novel numerical techniques, this paper estimates the effect of EHD force on ferrofluid treatment. Iron oxide additives of various nanoscale forms and dimensions are added to the operating fluid. The features of the carrier fluid were modified using an empirical model, and a combined FVM and FEM method was utilized to solve the issue. As a result, the application of an electric force increases the movement speed of the nanofluid and leads to the formation of a single, stronger vortex. Increasing voltage and utilizing a greater permeable medium also contribute to the enhancement of heat transfer.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2023)
Article
Thermodynamics
Zhijian Duan, Gongnan Xie, Bo Yu, Puhang Jin
Summary: The study focuses on designing optimized structures for liquid-cooled microchannel heat sinks with different pin-fin arrays using the topology optimization method for better performance. The goal is to minimize flow energy dissipation and average temperature of the bottom surface to facilitate more efficient design of microchannel heat sinks for electronic chips' cooling.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Anupam Bhandari
Summary: This study investigates the motion of a hydro-ferro-liquid in a rotating and stretching deformed cone. The governing equations of ferrohydrodynamic flow are simplified and dimensionalized using similarity variables for velocity and temperature distribution. The numerical solution of the reduced similarity equations for velocity and temperature is obtained using the finite element technique in COMSOL Multiphysics. The results show that magnetic viscosity is generated in the flow due to the rotation of the cone under the influence of the magnetic field. The study examines the velocity and temperature fields for different parameters and analyzes their effects on local heat transfer and stress on the cone's surface. The findings have practical implications for enhancing the sealing performance of spinning shafts and controlling heat in electronic devices.
NUMERICAL HEAT TRANSFER PART A-APPLICATIONS
(2023)
Article
Thermodynamics
Xin Cao, Huan-ling Liu, Xiao-dong Shao, Hang-bo Shi
Summary: This paper proposes a novel mini-channel heat sink with tessellated fins and investigates its heat cooling capacity numerically and experimentally. The results show that the new design is more conductive to heat transfer and optimized designs can further improve thermal performance and uniform substrate temperature.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Ahmad Reza Roozbehi, Mohammad Zabetian Targhi, Mohammad Mahdi Heyhat, Ala Khatibi
Summary: This numerical study investigates the modification of the hexagonal pin fin geometry to enhance the thermal and hydraulic performance of a heat sink. The results show that a vertex angle of 60 degrees and a relative length of 1 yield the optimum performance of the heat sink.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2023)
Article
Materials Science, Multidisciplinary
Bibhutibhusan Nayak, S. Narayana Jammalamadaka
Summary: This article presents a method for remote detection of bovine serum albumin (BSA) using modified cantilever beam magnetometry (CBM). By combining a magnetostrictive Fe70Ga30 cantilever with optical detection technique, researchers were able to detect high concentrations of BSA remotely. The results of this study demonstrate the potential of this method in estimating the magnetostriction of thin films.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Yu Hao, R. E. Camley, Z. Celinski
Summary: Magnetic particles have various applications and their magnetic state is determined by their size and the strength of an applied magnetic field. Numerical simulations were performed to study the effect of an applied field on the critical size of single-domain magnetic particles, and the critical field at which a particle becomes single-domain was determined.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Nitesh Singh, Naresh Kumar, Dharohar Sahadot, Anil Annadi, Vidyadhar Singh, Murtaza Bohra
Summary: The unique magnetic properties of FM/AFM and hard-FM/soft-FM nanocomposite thin films have significant relevance for numerous applications. The composition and performance of different magnetic phases in the nanocomposite films can be significantly affected by the laser ablation conditions and annealing temperature.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Alya Ali Musaed, Samir Salem Al-Bawri, Khaled Aljaloud, Wazie M. Abdulkawi, Mohammad Tariqul Islam, Mandeep Jit Singh, Zaini Sakawi, Husam Hamid Ibrahim
Summary: This research presents a wideband tunable metamaterial for body-centric applications in the millimeter-wave frequency band. The proposed metamaterial has a wide operating frequency range and enhanced gain, making it suitable for improving the antenna performance in 5G wireless communication systems.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Binod K. Rai, Boris Maiorov, Krzysztof Gofryk, Patrick O'Rourke, Catherine Housley, Henry Ajo, Asraf Sawon, Arjun K. Pathak, Narayan Poudel, Qiang Zhang, Travis J. Williams, Matthias Frontzek
Summary: This manuscript reports on the structural and magnetic properties of NdCuGa3. The study confirmed the crystal structure and magnetic phase transition of NdCuGa3 using XRD, neutron diffraction, magnetization, and specific heat measurements. The neutron diffraction data further confirmed the antiferromagnetic phase of NdCuGa3.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Haonan Li, Cong Li, Hailiang Huang, Guodong Hao, Fei Wang
Summary: The electronic structure and ferroelectric-ferromagnetic coupling properties of Y-doped and vacancy-containing GaN-ZnO heterojunctions are systematically investigated. The magnetism in vacancy-containing systems is generated by the spin polarization of unpaired electrons induced by cationic vacancies, while in Y-doped systems, bound magnetic polarons are formed by the orbital hybridization of s-state and d-state electrons of Y-doped elements.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Muhammad Ijaz, Hafeez Ullah, Bandar Ali Al-Asbahi, Mati Ullah Khan, Zaheer Abbas, Sana Ullah Asif
Summary: M-type BaFe11.4-xAlxCo0.6O19 hexaferrites with Al3+ substitutions were synthesized using the co-precipitation method followed by Sonochemical process. The synthesized materials were characterized using XRD, FTIR, UV-vis spectroscopy, VSM, SEM, and LCR meter. The results showed that aluminum doping decreased the band gap and enhanced the magnetic and dielectric properties of the hexaferrites, making them suitable for various applications.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Oleg I. Utesov
Summary: The elementary excitations spectrum of anisotropic frustrated antiferromagnets in the fan phase is discussed. It is found that the low-energy part of the spectrum consists of a gapless phason branch with linear dispersion and a gapped optical branch corresponding to the fan structure amplitude oscillations. In the high-energy part of the spectrum, the excitations are similar to the magnons of the fully polarized phase.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Alexander Ya. Simonovskii, Alexander A. Yanovskii, Arthur R. Zakinyan
Summary: In this study, the departure frequency of vapor bubbles during boiling of ferrofluid in a horizontal magnetic field is experimentally investigated. Two methods, visual and inductive, are used to measure the frequency of bubble departure. The results show that the bubble departure frequency can decrease with increasing magnetic field strength and increase with increasing temperature of the heat-emitting surface. A linear stability analysis is conducted to analyze the influence of the magnetic field on the frequency of bubble formation during ferrofluid boiling.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Oleg Heczko, Michal Rames, Vit Kopecky, Petr Vertat, Michal Varga, Ladislav Straka
Summary: Heusler Ni-Mn-Ga alloys are multiferroic materials that exhibit magnetic shape memory (MSM) phenomena. By doping transition elements into Ni2MnGa alloys, the transformation temperatures can be modified and complex behaviors can be observed, such as the variation in saturation magnetization and the effects of elemental substitution on compound properties.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Carlos Ariel Samudio Perez, Ariel Flaig de Marchi
Summary: This study investigates the electronic and magnetic properties of the Full-Heusler Fe2MnAs alloy using first-principles calculations. The alloy may form spontaneously and exhibits a ferromagnetic order and high spin-polarization. It can be transformed into a half-metal by contracting the lattice constant. Additionally, certain defects contribute to the spin-polarization of the alloy, making it a fully half-metallic material.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Satish Geeri, Aditya Kolakoti, Prasadarao Bobbili
Summary: In this study, an electromagnetic wave-absorbing material was fabricated using a polymer composite material with fiber orientation and Multiwall Carbon Nanotubes as filler materials, along with a Perfect Electric Conducting material. The experiments demonstrated strong electromagnetic absorbing properties for the composites with PEC-coated and non-PEC-coated materials. Mechanical, thermal, and morphological analysis confirmed the similar trend in properties. CRITIC analysis helped identify the sequence order of sustaining properties for the fabricated composites.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Yankai Chen, Ruoxue Zhang, Yukai An
Summary: The piezoelectricity, valley character, and magnetic properties of 2H-VS2 monolayer were studied, revealing its potential applications in spintronics and valleytronics due to its bipolar magnetic semiconductor characteristics and superior physical properties.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Leonardo S. Lima
Summary: This study investigates the thermodynamic quantities, such as entropy, specific heat, and magnetic susceptibility, in the next-nearest-neighbors Heisenberg model on a honeycomb-kagome lattice. The linear spin-wave approach is applied to obtain the temperature-dependent behavior of these quantities. Additionally, the entanglement negativity, a quantifier of quantum entanglement, and the spin Hall conductivity are also studied. The results show that all the thermodynamic quantities, as well as the entanglement negativity and spin Hall conductivity, exhibit an increasing trend with temperature. Furthermore, it is found that all the analyzed quantities approach zero in the low-temperature limit, consistent with experimental observations.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Zhaoxing Wang, Maximilian Kai Reimann, Wang Chen, Yikun Zhang, Rainer Poettgen
Summary: The Mo2FeB2-type compounds RE2Ga2Mg (RE = Tm, Er, Ho) exhibit a large magnetocaloric effect, making them promising for cryogenic magnetic cooling applications.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)