Article
Physics, Fluids & Plasmas
Leila Ghaderipoor, Mohammad Mardaani, Ehsan Amooghorban, Hassan Rabani
Summary: By using the extended mass-spring chain model, this study investigates the contribution of phonons to heat transport across a narrow vacuum gap through the harmonic approximation and Green's function technique. It shows that the phonon transmission across the vacuum gap can be improved under specific values of interaction strengths, incoming phonon frequency, and gap distance. The thermal conductance of the system is calculated as a function of interaction strength, gap distance, and temperature, revealing a suitable fitting function for determining or controlling the internal interaction strengths.
Article
Construction & Building Technology
Yubin Tang, Qiuhua Tao, Yi Chen, Jianwen Zheng, Yunran Min
Summary: This paper proposes a radiative cooling glass composite structure for windows based on existing radiant cooling materials and establishes a climate adaptive radiant cooling building indoor thermal environment assessment model. The average error of the assessment model is verified to be no more than 4.83%. Analysis shows that the use of radiative cooling glass can significantly lower indoor temperatures and improve the indoor thermal environment. However, the performance of radiative cooling is relatively weak in areas with high relative humidity.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Physics, Multidisciplinary
Stephen Sanders, Lauren Zundel, Wilton J. M. Kort-Kamp, Diego A. R. Dalvit, Alejandro Manjavacas
Summary: The study presents a theoretical framework for describing the temporal dynamics of radiative heat transfer in ensembles of nanostructures using an eigenmode expansion. The results reveal fundamental principles governing the thermalization of collections of nanostructures.
PHYSICAL REVIEW LETTERS
(2021)
Article
Thermodynamics
Minggang Luo, Junming Zhao, Linhua Liu
Summary: The near-field radiative heat transfer in nanoparticle systems is still not well understood and existing theories cannot be directly applied to systems with a large number of particles. To address this issue, researchers derived a continuum-scale governing equation from the particle-scale formulation and obtained a new formula for the radiative thermal conductivity tensor, which can be used to calculate the thermal conductivity in arbitrary multi-dimensional particulate systems with many-body interactions.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Materials Science, Multidisciplinary
Jonathan L. Wise, Denis M. Basko
Summary: In this study, the radiative heat current between two thin metallic layers separated by a vacuum gap was analytically calculated using the standard fluctuational electrodynamics framework. The role of dc conductivity of the metals compared to the speed of light in determining the heat current was identified, with different behaviors observed for poorly conducting metals versus well-conducting metals. Evanescent waves and their dominant role in heat current contributions were discussed in relation to the separation distance between the layers and the thermal wavelength.
Article
Thermodynamics
Jihong Zhang, Haotuo Liu, Kaihua Zhang, Jiangcheng Cao, Xiaohu Wu
Summary: This paper investigates the radiative heat transfer between stacked structures consisting of two different hyperbolic materials in both near-field and far-field. The results show that the far-field heat transfer is mainly affected by the substrate material, while the near-field heat transfer is dominated by the hyperbolic film. Additionally, the performance of heat transfer is influenced by the combination of different materials.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Physics, Multidisciplinary
Dong-min Kim, Sinwoo Choi, Jungwan Cho, Mikyung Lim, Bong Jae Lee
Summary: We experimentally demonstrate boosted in-plane thermal conduction by surface plasmon polaritons (SPPs) propagating along a thin Ti film on a glass substrate. We show that SPPs can propagate over centimeter-scale distances even along a supported metal film, and quantitatively validate the resulting ballistic heat conduction. Moreover, we experimentally demonstrate a significant enhancement of in-plane thermal conductivity compared to bulk value (approximately 25%) for a 100-nm-thick Ti film on a glass substrate. This research provides a new avenue to employ SPPs for heat dissipation along a supported thin film and can potentially mitigate hot-spot issues in microelectronics.
PHYSICAL REVIEW LETTERS
(2023)
Article
Thermodynamics
Ziqi Yu, Xiaopeng Li, Taehwa Lee, Hideo Iizuka
Summary: We demonstrate tunable thermal rectification enabled by near-field radiative heat transfer between two Weyl semimetal nanoparticles above graphene nanoribbons by rotating the particles and varying their loss factors. Through the rotation, the thermal rectification is significantly enhanced thanks to the nonreciprocal particles and the substrate that are more strongly coupled than the counterpart systems having reciprocal particles. Nonreciprocal particles induce spinning Poynting vectors, whose directions can be controlled by rotating the particles and can selectively couple to surface modes excited in the graphene nanoribbons.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Multidisciplinary Sciences
Bo Zhao, Sid Assawaworrarit, Parthiban Santhanam, Meir Orenstein, Shanhui Fan
Summary: Direct current (DC) converters are essential in electronic circuits, with traditional high-efficiency DC voltage converters facing limitations due to electromagnetic noise from switching currents. A photonic transformer has been proposed as a potential solution, offering near-unity conversion efficiency and high voltage conversion ratios.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
Roman N. Lee, Matthew D. Schwartz, Xiaoyuan Zhang
Summary: An analytic formula is provided for the total scattering cross section of an electron and a photon at order alpha(3) in QED, including both real-emission and virtual Compton scattering contributions. When combined with the recent analytic result for the pair-production cross section, the complete alpha(3) cross section is determined. Modern multiloop calculation techniques are used to compute the next-to-leading order calculation and pair-production cross section.
PHYSICAL REVIEW LETTERS
(2021)
Article
Thermodynamics
S. G. Castillo-Lopez, C. Villarreal, R. Esquivel-Sirvent, G. Pirruccio
Summary: This theoretical study focuses on the near-field radiative heat transfer between high-T-c superconducting thin films, showing that thin films enhance heat transfer significantly compared to bulk plates. The optical response above and below T-c plays a crucial role, with the superconducting phase transition leading to a suppression of total heat flux.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Jie-Long Fang, Lei Qu, Yong Zhang, Hong-Liang Yi
Summary: In this study, we investigated the radiative heat transfer between nanoparticles placed above a thin film using the dipole approximation and reflection Green's function. Our findings demonstrate a significant enhancement of heat transfer between particles due to strong surface modes excited at particle resonances. Spectral analysis confirms the presence of intense surface modes and the amplification effect of the SiC thin film. Additionally, we observed that the thin film can enhance heat transfer at considerable distances and analyzed the role of interparticle distance in this enhancement.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Optics
Lu Lu, Bo Zhang, Bowen Li, Jinlin Song, Zixue Luo, Qiang Cheng
Summary: Magneto-optical materials have the potential to actively control near-field radiative heat transfer under weak magnetic fields. This study investigates the NFRHT between dual MO graphene/InSb core-shell nanoparticles-based metamaterials and provides insights into the physical mechanisms and applications of magnetic field-controlled devices.
Article
Physics, Fluids & Plasmas
V Munzar, D. Klir, J. Cikhardt, J. Kravarik, P. Kubes, J. Malir, J. Novotny, K. Rezac, A. Shishlov, V. A. Kokshenev, R. K. Cherdizov, N. A. Ratakhin
Summary: The paper presents the results of the first Z-pinch-driven ion deflectometry experiments conducted on the GIT-12 pulse power generator. Using ion deflectometry, the radial distribution of path-integrated B-fields near the axis in high-energy density plasmas was obtained, and a 2D topological map of local azimuthal B-fields was presented through numerical retrieval of experimental deflectograms.
PHYSICS OF PLASMAS
(2021)
Article
Engineering, Industrial
Yang Li, Anyuang Deng, Lintao Zhang, Bin Yang, Engang Wang
Summary: The research proposed a new type of magnetic field arrangement to suppress meniscus fluctuation in slab continuous casting. Results showed that the maximum height of meniscus decreased and fluctuation significantly decreased with an applied magnetic field of 0 to 0.05 T. The surface velocity was not sensitive to the increase in magnetic field magnitude. The experiment results agreed well with simulation results, indicating the effectiveness of the proposed magnetic field arrangement.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2021)
Article
Physics, Applied
George Dedkov, Arthur Kyasov
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2015)
Article
Physics, Applied
G. V. Dedkov, A. A. Kyasov
TECHNICAL PHYSICS LETTERS
(2016)
Review
Physics, Multidisciplinary
G. V. Dedkov, A. A. Kyasov
Article
Physics, Applied
G. V. Dedkov, A. A. Kyasov
Article
Physics, Applied
G. V. Dedkov, A. A. Kyasov
TECHNICAL PHYSICS LETTERS
(2017)
Article
Physics, Condensed Matter
G. V. Dedkov, A. A. Kyasov
PHYSICA B-CONDENSED MATTER
(2014)
Article
Physics, Multidisciplinary
G. V. Dedkov, A. A. Kyasov
Article
Physics, Applied
G. V. Dedkov, A. A. Kyasov
Article
Physics, Multidisciplinary
G. Dedkov, A. A. Kyasov
CHINESE JOURNAL OF PHYSICS
(2018)
Article
Physics, Applied
G. V. Dedkov, A. A. Kanametov
Article
Physics, Condensed Matter
G. V. Dedkov, A. A. Kyasov
PHYSICS OF THE SOLID STATE
(2020)
Article
Astronomy & Astrophysics
George Dedkov
Summary: This study investigates the van der Waals friction force between metallic plates and shows a sharp increase in friction at low temperatures, following a T-4 trend with decreasing temperature. A plateau effect is observed in the presence of residual resistance on the metal surface, and a weak force-distance dependence is found. The absolute values of the friction forces are suitable for measurements in AFM-based experiments.
Article
Physics, Applied
G. V. Dedkov
Summary: This paper presents the calculation results of the Casimir-Lifshitz friction force and heating rate for a small metal particle moving above a metal surface at different local temperatures. It is observed that there is a strong interplay of temperatures, particle velocity, and separation distance, resulting in an anomalous direction of heat flow and a peak temperature dependence of the friction force at low temperatures. The study also discusses the conditions for experimental measurement of these effects.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Condensed Matter
G. V. Dedkov, A. A. Kyasov
PHYSICS OF THE SOLID STATE
(2018)
Article
Physics, Applied
G. V. Dedkov, A. A. Kyasov
TECHNICAL PHYSICS LETTERS
(2018)