Article
Thermodynamics
Yangyu Guo, Zhongwei Zhang, Masahiro Nomura, Sebastian Volz, Moran Wang
Summary: This study investigates the thermal phonon vortex in graphene ribbon using the discrete-ordinate solution of the phonon Boltzmann equation under Callaway's dual relaxation model. The obtained phonon scattering rates from ab initio calculations reveal the transition from phonon vortex transport to conventional Fourier's heat conduction. The physical mechanism behind the evolution of the phonon vortex is attributed to the wide phonon mean free path distribution of resistive processes, resulting in a hierarchical vortex series in complex geometries.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Physics, Multidisciplinary
Alexandre Jaoui, Adrien Gourgout, Gabriel Seyfarth, Alaska Subedi, Thomas Lorenz, Benoit Fauque, Kamran Behnia
Summary: This study discovers a two-component fluid of electrons and phonons in antimony (Sb) crystals, and highlights the dominant role of frequent momentum-conserving collisions between electrons and phonons in the transport properties.
Article
Multidisciplinary Sciences
Qinshu Li, Fang Liu, Song Hu, Houfu Song, Susu Yang, Hailing Jiang, Tao Wang, Yee Kan Koh, Changying Zhao, Feiyu Kang, Junqiao Wu, Xiaokun Gu, Bo Sun, Xinqiang Wang
Summary: This study reveals that even for materials with similar Debye temperatures, a significant portion of phonons can transport inelastically across interfaces at high temperatures, greatly enhancing the interface thermal conductance. The sharpness of the interface strongly affects the phonon transport process. These findings provide new insights and opportunities for engineering interface thermal conductance in microelectronics materials.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Zhonghua Yang, Kunpeng Yuan, Nan Li, Xiaoliang Zhang, Ming Hu
Summary: Phonon hydrodynamics can efficiently flow in low-dimensional materials at room temperature. Our study reveals the manipulation of phonon hydrodynamics in layered ferroelectric materials using an external electric field, which can contribute up to 50% of the overall thermal transport.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Thermodynamics
Xin Ran, Yunfan Huang, Moran Wang
Summary: This paper proposes a hybrid Monte Carlo-discrete ordinates method (MC-DOM) for predicting phonon transport in mesoscopic systems with complex interfaces. The method combines the computational efficiency of DOM in the bulk region with the flexibility of MC near complex interfaces. It has been shown that the hybrid method runs faster than the pure particle method and is applicable for high-precision temperature calculation. The method enriches numerical tools for mesoscopic phonon transport simulation and contributes to the understanding and optimization of heat transport in micro/nanosystems with complex geometries.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Physics, Applied
Xin Huang, Yangyu Guo, Sebastian Volz, Masahiro Nomura
Summary: This study investigates the phonon hydrodynamics in graphite micro-structures of different sizes and temperatures, revealing the strengthening and temperature range shift of hydrodynamic phonons with increasing width. The findings provide insights into the behavior of finite-sized graphitic materials and guidance for experimental observation.
APPLIED PHYSICS EXPRESS
(2022)
Article
Thermodynamics
M. Di Domenico, A. Sellitto, V Zampoli
Summary: A non-local and non-linear thermodynamical model of heat transfer at nanoscale beyond the well-known Maxwell-Cattaneo theory is derived and proven to be compatible with the second law of thermodynamics. The model is applied to investigate the linear propagation of a heat pulse in one-dimensional nanosystems, and the predicted results are compared with those from the Maxwell-Cattaneo theory, highlighting the possible influence of non-local effects and relaxation effects of higher-order fluxes. Some issues related to initial data and boundary conditions are also discussed.
CONTINUUM MECHANICS AND THERMODYNAMICS
(2022)
Article
Materials Science, Multidisciplinary
David Msika, Dalila Bounoua, Olivier Demortier, Francoise Damay, Romuald Saint-Martin, Rolf Heid, Alexandre Ivanov, Andrea Piovano, Frederic Bourdarot, David Berardan, Loreynne Pinsard-Gaudart, Sylvain Petit
Summary: This paper focuses on the thermal transport properties of antiferromagnetic spin chains cuprates. The spinons, chain magnetic excitations, participate in heat transport at low temperature, but spinon heat transport decays well below room temperature, possibly due to a coupling with phonons. Through inelastic neutron scattering, we extensively studied the lattice dynamics of spin chain compounds Sr2CuO3, Ca2CuO3, and double spin-chain compounds SrCuO2. We conclude that there are no obvious anomalies in the phonon dispersions, suggesting a weak spinon-phonon coupling regime.
Article
Engineering, Chemical
Ali Akbar Sarbanha, Faical Larachi, Seyed Mohammad Taghavi
Summary: Marinized bubbling fluidized beds are hindered in their use at sea due to a limited understanding of the influence of sea waves on their hydrodynamics, heat transfer, and efficiency. This study used direct visualization techniques to investigate the solids mixing and hydrodynamics of these beds under different gas distribution patterns. The effects of tilt angles and oscillation parameters were compared with conventional bed units, and different inlet distribution patterns were explored to optimize operation in marine environments.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Physics, Applied
Jay Amrit, Konstantin Nemchenko, Tatiana Vikhtinskaya
Summary: This paper proposes a model for the thermal conductivity of 2D samples when mean free paths due to phonon-phonon interactions exceed sample dimensions. It examines the physical mechanisms of stationary heat flux and nonequilibrium temperature distribution, deriving a recursive equation to quantify phonon scattering effects. The model shows non-monotonic dependence of heat flux and thermal conductivity on sample dimensions, suggesting experimental measurements are influenced by thermometer placement.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Multidisciplinary Sciences
Carlos A. Polanco, Ambroise van Roekeghem, Boris Brisuda, Laurent Saminadayar, Olivier Bourgeois, Natalio Mingo
Summary: The thermal conductance quantum is a fundamental quantity in quantum transport theory, but the disagreement between experiments and theory still exists. This study uses massive parallel calculations to find that macroscopic concepts are inadequate to analyze the data, and the temperature distribution and the dimensions and placement of components in the structure significantly affect the measured values of thermal conductance. Additionally, the diffusion transport assumptions in data analysis may lead to considerable differences between the measured values and the actual thermal conductance, calling for experimental validation.
Article
Physics, Applied
Bernd Gotsmann, Andrea Gemma, Dvira Segal
Summary: This Perspective discusses the concepts, theoretical and experimental progress in the field of quantized phonon transport, with a focus on channels such as molecular systems. It highlights open questions and research opportunities and emphasizes the recent advancements in experimental capabilities.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Fluids & Plasmas
Yanjiang Guo, Yachao Sun, Lei Wang
Summary: The energy diffusion process in a few two-dimensional Fermi-Pasta-Ulam-type lattices is simulated numerically through the equilibrium local energy spatiotemporal correlation. The diffusion propagator consists of a bell-shaped central heat mode and a sound mode extending with a constant speed, in accordance with the nonlinear fluctuating hydrodynamic theory. An effective phonon approach is proposed to estimate the frequencies of renormalized phonons and the sound speed accurately. However, discrepancies are noticeably observed.
Article
Physics, Multidisciplinary
Yue Liu, Dahai He
Summary: Based on the self-consistent phonon theory, this study calculated the spectral energy density, fitted the spectral energy density, and obtained phonon frequency and relaxation time in one-dimensional nonlinear lattices, validating the phonon mean free path and behavior at different temperatures.
CHINESE PHYSICS LETTERS
(2021)
Review
Physics, Condensed Matter
Kanka Ghosh, Andrzej Kusiak, Jean-Luc Battaglia
Summary: Phonon hydrodynamics is an exotic phenomenon challenging conventional understanding of phonon scattering. It opens up new avenues in phonon physics and engineering, and has promising applications in micro and nanoelectronic devices. This review covers comprehensive developments and recent advancements through experiments, analysis, and numerical techniques, exploring the factors influencing this peculiar motion and its potential applications.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Mathematics, Applied
P. Rogolino, V. A. Cimmelli
ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND PHYSIK
(2020)
Article
Thermodynamics
Ruo-Yu Dong, Yuan Dong, Antonio Sellitto
Summary: This study investigates the non-linear and nonlocal behavior of heat and momentum transport under extreme conditions, focusing on the varying effective viscosity and shear thinning effect in nano-channel flow. Molecular dynamics simulations confirm the decrease in viscosity with shear rate, in agreement with the proposed model.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Mathematics, Applied
A. Sellitto, I Carlomagno, M. Di Domenico
Summary: The paper introduces a new two-temperature model to describe different states that electrons and phonons can undergo in nanoscale heat transfer, with consideration of the second law of thermodynamics for physical admissibility. The model is then used to study heat wave propagation and highlight the special role played by nonlocal and nonlinear effects.
ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND PHYSIK
(2021)
Article
Thermodynamics
M. Di Domenico, D. Jou, A. Sellitto
Summary: The study shows that the nonlinear generalization of the Maxwell-Cattaneo equation affects the speed of propagation of nonlinear thermal waves, which depends on the amplitude of the waves and is smaller than the speed of linear waves. External heat flux can be used to control the speed of thermal waves in a material layer.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
I Carlomagno, V. A. Cimmelli, D. Jou
Summary: The study investigates heat rectification by applying a tensile mechanical stress in thermoelastic systems, showing that the rectification coefficient can be adjusted by various control parameters and internal strain distributions. The research demonstrates that higher levels of internal strain distribution lead to higher rectification coefficients and the value of external control on the rectification coefficient.
JOURNAL OF THERMAL STRESSES
(2021)
Article
Multidisciplinary Sciences
I Carlomagno, M. Di Domenico, A. Sellitto
Summary: The proposed theoretical model studies heat transfer at the nanoscale using high-order thermodynamic fluxes, compatible with extended irreversible thermodynamics. It can handle both relaxational and non-local effects, taking into account different heat carriers' temperatures. The model is hyperbolic and used to investigate thermal wave propagation.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2021)
Article
Mathematics, Applied
V. A. Cimmelli
Summary: The study shows that the constitutive equations of nonequilibrium thermodynamics must be nonlocal. A thermodynamic model of the Guyer-Krumhansl heat-transport equation is derived within the framework of weakly nonlocal Rational Thermodynamics. Additionally, some nonlinear generalizations of the Maxwell-Cattaneo equation were studied in the context of experiments on thermal wave propagation.
ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND PHYSIK
(2021)
Article
Acoustics
M. Sciacca, I. Carlomagno, A. Sellitto
Summary: Starting from a proposal of a nonlinear Maxwell-Cattaneo equation for heat transport at the nanoscale, this study derives a nonlinear Schrodinger equation for the amplitudes of heatflux perturbation in a special case of thermal-wave propagation. The complete integrability of the obtained equation is investigated to demonstrate the existence of infinite conservation laws and exact solutions. The study focuses on the simplest nontrivial solutions, bright and dark (thermal) solitons, which have potential applications in energy transport and information transmission in phononic circuits.
Article
Multidisciplinary Sciences
Vito Antonio Cimmelli, Patrizia Rogolino
Summary: This paper discusses the importance of constitutive equations in modeling the material properties of physical systems in continuum physics. The authors compare two perspectives, one considering the second law of thermodynamics as a restriction on the constitutive equations, and the other considering it as a restriction on the thermodynamic processes. They propose an amendment to the second law and prove that it is a necessary condition for satisfying the entropy inequality. By shedding light on the geometric aspects, the authors make this important result more intuitive and accessible to a wider audience.
Article
Thermodynamics
M. Di Domenico, A. Sellitto, V Zampoli
Summary: A non-local and non-linear thermodynamical model of heat transfer at nanoscale beyond the well-known Maxwell-Cattaneo theory is derived and proven to be compatible with the second law of thermodynamics. The model is applied to investigate the linear propagation of a heat pulse in one-dimensional nanosystems, and the predicted results are compared with those from the Maxwell-Cattaneo theory, highlighting the possible influence of non-local effects and relaxation effects of higher-order fluxes. Some issues related to initial data and boundary conditions are also discussed.
CONTINUUM MECHANICS AND THERMODYNAMICS
(2022)
Article
Mathematics, Applied
I. Bochicchio, F. Giannetti, A. Sellitto
Summary: This study considers a model of nonlocal heat transfer at nanoscale in rigid bodies and analyzes three different strategies for setting up boundary conditions. The results suggest the influence of interactions on unknown fields and demonstrate the well-posedness of the problem.
ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND PHYSIK
(2022)
Review
Chemistry, Multidisciplinary
Vito Antonio Cimmelli, Patrizia Rogolino
Summary: This article reviews nonlocal and nonlinear heat transport in nanosystems, analyzes differential equations describing this phenomenon, introduces a new heat transport equation, and applies thermomass theory to a Silicon-Germanium alloy thermoelectric energy generator.
Article
Physics, Multidisciplinary
Vito Antonio Cimmelli, Patrizia Rogolino
Summary: This study analyzes the efficiency of a silicon-germanium alloy as a thermoelectric energy converter, taking into account the influence of composition and temperature on thermal conductivity. The dependency on composition is determined using a non-linear regression method, while the dependency on temperature is approximated through a first-order expansion. The differences from the case of thermal conductivity depending solely on composition are highlighted. The efficiency of the system is analyzed based on the assumption that optimal energy conversion corresponds to the minimum rate of energy dissipation, and the composition and temperature values that minimize this rate are calculated.
Article
Mathematics
Vito Antonio Cimmelli
Summary: According to the second law of thermodynamics, the local entropy production must be nonnegative for any thermodynamic processes. In 1996, Muschik and Ehrentraut proposed an amendment to the second law, which assumes that reversible process directions in state space exist only in correspondence with equilibrium states. They proved that the restriction of the constitutive equations is the sole possible consequence of non-negative entropy production. Recently, Cimmelli and Rogolino extended this result to nonregular processes and provided applications in the thermodynamics of an interface separating two different phases of a Korteweg fluid and the derivation of the thermodynamic conditions necessary for shockwave formation.
Article
Chemistry, Multidisciplinary
Isabella Carlomagno, Vito Antonio Cimmelli, David Jou
Summary: We study heat rectification in composition-graded nanowires considering nonlocal and nonlinear effects in a generalized Guyer-Krumhansl equation. By solving the heat equation with a composition and temperature dependent thermal conductivity, we explore the conditions under which nonlocal or nonlinear effects or both contribute to heat rectification and how they can be controlled by external radiative flux. We also calculate the corresponding rectification coefficients and identify the physical conditions for the system to become a thermal diode.
