The mechanisms of rotation of dust particles in a magnetic field inside an insert that determines the position of the first standing stratum in a glow discharge are considered. It has been shown that in fields exceeding 0.5 T, the drag of dust particles by a neutral gas can acquire considerable significance in addition to ion drag. Taking this mechanism into account leads to a significant increase in the rotation rate and good agreement with experimental data.
The paper presents the results of laboratory studies of electromagnetic and resistive heating of oil source rock under unilateral irradiation to kerogen pyrolysis onset temperatures. Comparison of the two heating methods showed that microwave electromagnetic heating is more preferable than resistive heating. Electromagnetic heating studies were carried out at a radiation frequency of 2.45 GHz. The presented results show that the intensity of electromagnetic heating of the oil source rock is nonlinear and depends on the change in the dielectric properties of the rock during heating and the weakening of the microstructure of the sample due to nonuniform heating of the rock.
Thermodynamic modeling is used to optimize a hybrid power plant circuit with a solid oxide fuel cell with internal methane reforming and a gas turbine. Assuming complete one-way conversion, the possibility of fuel cell operation without generating heat for recycling is demonstrated. As a result of optimization of the hybrid power plant, an original scheme was obtained with a fuel cell with internal heat regeneration and methane reforming and an efficiency of over 90
As a result of studying degassing on an electrode as a current pulse flows through the electrolyte, modes were identified in which gaseous electrolysis products appear explosively. The degassing kinetics was studied by perturbing the electrical resistance between the electrodes. The experimental results are generalized using the theories of electrocapillarity and fluctuation nucleation of the gas phase.
A unified fundamental equation of state for methane has been developed, conveying experimental data on density, isochoric and isobaric heat capacity, and the speed of sound within the experimental uncertainty of these data in the range of parameters of state for pressure up to 500 MPa, density up to 450 kg/m3, at temperatures from 90.641 to 620 K. A unified fundamental equation of state has been developed using the large-scale theory of critical phenomena. In accordance with the power laws of scale theory, this equation conveys the behavior of isothermal compressibility, isochoric and isobaric heat capacity, and the speed of sound in the asymptotic vicinity of the critical point. The expression for the Helmholtz free energy, which underlies the unified fundamental equation of state, consists of three terms: the ideal gas component, the regular component, and the singular component. The structure of the singular component includes a crossover function in the form of an exponential dependence on density, which in the region of low densities and pressures ensures the transition of the unified fundamental equation of state to a virial equation of state. The singular component of the unified fundamental equation of state is calculated based on a new representation of the scaling hypothesis, which is based on the linear Scofield–Litster–Ho model and Benedek hypothesis. The similarity relation is also used to calculate the parameters of the singular component of the unified fundamental equation of state, based on which a relationship is established between the parameters of the singular component of the unified fundamental equation of state and parameters of the Pokrovsky model for a real liquid. It is shown that the use of the similarity relation made it possible to reduce the number of individual parameters of the unified fundamental equation of state and exclude data on the isochoric heat capacity C_v related to the asymptotic vicinity of the critical point from the calculation scheme when determining its coefficients. The agreement between results obtained and calculations performed, first, using crossover models for a wide vicinity of the critical region, and second, using Setzmann and Wagner’s fundamental equation of state (1991) and Bezverkhy and Dutova’s combined equation (2023) is discussed.
