Investigation of laminar flows of a chemically active gas-dust medium in a circular tube
E.E. Peskova1, V.N. Snytnikov2
1Federal State Budgetary Educational Institution of Higher Education “National Research Ogarev Mordovia State University”, Saransk, Russia
2Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russia
Keywords: mathematical modeling, subsonic flows, two-phase medium, chemical reactions, heat flux
Abstract
Laminar flows of a gas-dust medium with chemical reactions in an axisymmetric tube are studied in much detail in numerical experiments. The study is performed for non-oxidative reactions of catalytic synthesis of hydrocarbons from methane. The hot walls of the tube warm up a two-phase flow of methane and catalytic nanoparticles. Heating of this flow ensures endothermic conversion of methane into hydrocarbons and hydrogen. It is shown that the presence of catalytic nanoparticles in the tube, which activate heterogeneous-homogeneous reactions, leads to significant deviation of the two-phase medium flow from the Poiseuille flow of a single-component gas due to changes in the medium volume and its viscosity. The change in the heat regime along the tube with a change in the thermal conductivity of the reactive medium is investigated. Calculations are performed for various values of the wall temperature, particle concentration, laminar flow velocity, and other parameters. It is found that the medium velocity and the gas component distributions in the volume and at the tube outlet are most strongly affected by the methane activation energy on the surface of the catalytic nanoparticles, particle diameter, and particle concentration.
|
