Radiation influence on the temperature-dependent parameters of fluids

Abstract

Based on the fundamental Bogolyubov chain of equations, a model relating the structural and thermophysical properties of the nonequilibrium liquid systems under irradiation in stationary state is introduced. The obtained results suggest that the thermophysical properties of the liquid systems under irradiation are defined by the "effective temperature" that can be calculated from the perturbed momentum distribution functions of the systems. It is shown that the structural changes in the liquid systems under irradiation are caused by the changes in the coefficients of the Maxwell distribution function due to the momentum exchange between the active particles and the particles forming the liquid. To confirm the theoretical predictions, a qualitative comparison of the model with the existing experimental data on irradiation influence on the surface tension coefficients of liquids is performed.

Вплив Радіаційного Опромінення На Параметри Полегшеної Дифузії Модельної Медико-Біологічної Системи

“…Earlier, we already considered the mechanism described above. Namely, in the framework of the formalism of the Bogolyubov-Born-Green-Kirkwood-Yvon (BBGKY) chain of equations, an approach was developed to determine the variations in the thermodynamic properties and the structure of liquid systems due to the action of a stationary isotropic irradiation [45]. It should be noted that this approach has certain restrictions on the irradiation character.…”

MD simulation of the radiation influence on the thermophysical properties and the structure of water

“…Earlier, based on the fundamental Bogolyubov chain of equations [31] there was suggested the model relating the structural and thermophysical properties of the nonequilibrium liquid systems under irradiation in the stationary state [32]. Within that model it was suggested that the irradiation changed the structure of the liquid system.…”

“…(2) Therefore, the developed theoretical model of the process [32] allowed calculating thermophysical properties of the stationary nonequilibrium liquid systems under irradiation from the thermophysical properties of the correspondent equilibrium liquid systems considering the new parameter T ef f .…”

“…The SPC rigid model was used in our simulations as it gives structural and dynamic parameters of the bulk water that are in accord with the experimental data [39,43] and at the same time it gives the results for the radial distribution functions (RDF) and momentum distribution functions that are not blurred by inclusion of the internal degrees of freedom. It seems to be attractive as we suggest that one of the main mechanisms responsible for the changes of the thermodynamic properties of the liquid systems under irradiation is the change in the momentum distribution function [32]. Therefore, using SPC model seems to be a reasonable choice in the first approximation.…”

“…To find the physical mechanism of the radiation influence on water causing the observed structural changes the obtained simulation results are compared to the theoretical model of the process developed earlier [32]. In order to calculate the "effective temperatures" that characterize the structural and thermophysical properties of the stationary nonequilibrium liquid system under irradiation the momentum distribution functions have been extracted from the simulation data for the different irradiation energies.…”