The behavior of a liquid flowing through a fixed bulk porous layer of a granular catalyst is considered. The effects of the nonuniformity of the fluid velocity field, which arise when the surface of the layer is curved, and the effect of the resulting inhomogeneity on the speed and nature of the course of chemical reactions are investigated by the methods of a computational experiment.
A model of a counterflow vortex tube is presented to investigate the dependence of the influence of hot exit area on the temperature separation. Computational experiments were done for 37 models for different values of the area of the hot exit ring. In a number of experiments, the pressure of the air supplied to the inlet varies in order to take into account the possible effects of computational and model errors. An anomalous result is obtained for the value of the hot exit area ∼30 cm2. Conclusions are drawn about the range of the most suitable hot exit sizes for the considered configuration of the vortex tube.
Modeling of the vortex tube for several variants of the size and shape of inlets of the swirl is carried out. A mathematical model of the process is written. Computational modeling was based on the LES method using the PIMPLE algorithm in the OpenFOAM computational package. Considerable attention was paid to using uniform orthogonalized meshes, while the shape and size of the swirl of the swirl was determined by the feature of the mesh constructed. It is shown that, under certain initial conditions, the effect of thermal stratification can be inversed for some forms of the swirler.
Mathematical modeling of evaporation of liquid and condensation of gaseous argon is performed for small deviations from the saturation state. The simulation is performed using molecular dynamics methods, using the Lennard-Jones interaction potential. The thermodynamic parameters are calculated from the wide-range equation of state. The results of the calculations are compared with known experimental data.
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