149 citations · 357 across the 16 of their papers we have counts for
19 papers
Spectral properties of dissipation
Peter Ván, Robert Kovács, Federico Vázquez
The novel concept of spectral diffusivity is introduced to analyse the dissipative properties of continua. The dissipative components of a linear system of evolution equations are…
A case study of non-Fourier heat conduction using Internal Variables and GENERIC
Mátyás Szücs, Michal Pavelka, Róbert Kovács +3
Applying simultaneously the methodology of Non-Equilibrium Thermodynamics with Internal Variables (NET-IV) and the framework of General Equation for the Non-Equilibrium Reversible-…
Size effects and beyond-Fourier heat conduction in room-temperature experiments
Anna Fehér, Norbert Lukács, László Somlai +5
It is a long-lasting task to understand heat conduction phenomena beyond Fourier. Besides the low-temperature experiments on extremely pure crystals, it has turned out recently tha…
Estimating the damage of railway carriage wheels equipped with disc brakes
Márton Krénusz, Róbert Sándor Kovács, Miklós Krémer
The aim of this paper is to estimate the damage of railway carriage wheels caused by lock-up braking. First, we investigate the typical characteristics of wheel-rail contact includ…
Continuum modeling perspectives of non-Fourier heat conduction in biological systems
Ákos Sudár, Gergely Futaki, Róbert Kovács
The thermal modeling of biological systems has increasing importance in developing more advanced, more precise techniques such as ultrasound surgery. One of the primary barriers is…
Novel evaluation method for non-Fourier effects in heat pulse experiments
Anna Fehér, Róbert Kovács
The heat pulse (flash) experiment is a well-known and widely accepted method to measure the thermal diffusivity of a material. In recent years, it is observed that the thermal beha…
Analytical and numerical modelling of ballistic heat conduction observed in heat pulse experiments
Gábor Balassa, Patrizia Rogolino, Ágnes Rieth +1
Among the three heat conduction modes, the ballistic propagation is the most difficult to model. In the present paper, we discuss its physical interpretations and showing different…
When theories and experiments meet: rarefied gases as a benchmark of non-equilibrium thermodynamic models
Róbert Kovács, Patrizia Rogolino, David Jou
The role of thermodynamics in deriving constitutive equations is unique, and various approaches have been developed in the last decades. In the present paper, the frameworks of Ext…
Ballistic-diffusive model for heat transport in superlattices and the minimum effective heat conductivity
Federico Vázquez, Péter Ván, Róbert Kovács
There has been much interest in semiconductor superlattices because of showing very low thermal conductivities. This makes them especially suitable for applications in a variety of…
Numerical treatment of nonlinear Fourier and Maxwell-Cattaneo-Vernotte heat transport equations
Róbert Kovács, Patrizia Rogolino
The second law of thermodynamics is a useful and universal tool to derive the generalizations of the Fourier's law. In many cases, only linear relations are considered between the…
Variational principles and thermodynamics
Péter Ván, Róbert Kovács
Variational principles play a fundamental role in deriving evolution equations of physics. They are working well in case of nondissipative evolution but for dissipative systems the…
Thermodynamical extension of a symplectic numerical scheme with half space and time shift demonstrated on rheological waves in solids
Tamás Fülöp, Róbert Kovács, Mátyás Szücs +1
On the example of the Poynting-Thomson-Zener rheological model for solids, which exhibits both dissipation and wave propagation - with nonlinear dispersion relation -, we introduce…
Non-equilibrium theories of rarefied gases: internal variables and extended thermodynamics
Róbert Kovács, Damir Madjarević, Srboljub Simić +1
Limits of classical constitutive laws such as Fourier and Navier-Stokes equations are discovered since decades. However, the proper extensions -- generalizations of these are not u…
Implicit numerical schemes for generalized heat conduction equations
A. Rieth, R. Kovács, T. Fülöp
There are various situations where the classical Fourier's law for heat conduction is not applicable, such as heat conduction in heterogeneous materials or for modeling low-tempera…
Second sound and ballistic heat conduction: NaF experiments revisited
Róbert Kovács, Péter Ván
Second sound phenomenon and ballistic heat conduction, the two wave like propagation modes of heat, are the two most prominent, experimentally observed non-Fourier effects of heat…
Guyer-Krumhansl-type heat conduction at room temperature
P. Ván, A. Berezovski, T. Fülöp +4
Results of heat pulse experiments in various artificial and natural materials are reported in the paper. The experiments are performed at room temperature with macroscopic samples.…
Thermodynamic hierarchies of evolution equations
P. Ván, R. Kovács, T. Fülöp
Non-equilibrium thermodynamics with internal variables introduces a natural hierarchical arrangement of evolution equations. Three examples are shown: a hierarchy of linear constit…
Generalized heat conduction in heat pulse experiments
R. Kovács, P. Ván
A novel equation of heat conduction is derived with the help of a generalized entropy current and internal variables. The obtained system of constitutive relations is compatible wi…
Monte Carlo simulation of the electrical properties of electrolytes adsorbed in charged slit-systems
R. Kovács, M. Valiskó, D. Boda
We study the adsorption of primitive model electrolytes into a layered slit system using grand canonical Monte Carlo simulations. The slit system contains a series of charged membr…