Numerical modelling of raw materials atomization and vaporization in a heat carrier gas flow in technical carbon production based on the Euler approach

Abstract

Previously, the authors of this article proposed a 3D Euler-Eulerian model of raw materials spraying and evaporation in the heat-carrier gas flow in the carbon production reactor. The raw materials' droplets fragmentation and evaporation are considered as the carrier and dispersed phase interaction. The continuous phase is a heat carrier gas whose motion is described by the Navier-Stokes equations. Dispersed phase (droplets of raw material and products of its evaporation) motion is described using a non-uniform convective-diffusion equation for the particle concentration. The model was tested with water as a raw material. In this work, hydrocarbons are specified as raw materials. It is proposed next to solve the inverse problem with the target functional providing zero contact of the unevaporated raw materials with the reactor wall. Then the number of solid coke particles in the final product will be minimal. An analysis is made of the unevaporated raw material area sensitivity to the inlet velocity of the heat-carrier gas flow. This parameter has the most impact on the distribution area of the unevaporated raw materials and is assumed to be varied in the optimization problem.

Three-dimensional Numerical Model of Kerosene Evaporation in Gas Turbine Combustors

“…The study of the liquid fuel evaporation is carried out in the FlowVision software package [1][2][3][4]. The evaporation of fuel droplets in the air stream is modeled using the Eulerian approach to describe the interaction between the continuous (carrier) and dispersed phase [20].…”

“…It means there are unique data for the calibration of complex three-dimensional numerical models of kerosene atomization, evaporation, and mixing under conditions similar to aircraft engines and gas turbines. In this study, the FlowVision software package (FlowVision PC) is validated [3,4] based on the unique experimental data from [7] in terms of the reliability of the results obtained on its basis for solving phase transition problems.…”

“…5) The work is aimed at the fuel evaporation calculation and validation. It should be noted that the works given in our brief review, as well as the works [3,4], describe methods for calculating both atomization and evaporation of the dispersed phase. The FlowVision PC has a model of particle atomization during the secondary droplet decay and, in general, the secondary decay can be calculated in the package.…”

“…Analyzing the solution sensitivity to the spectrum, the range of changes in the diameters of kerosene droplets supplied to the chamber is selected, which ensures the evaporation rate and Sauter mean diameter of fuel droplets as much as possible coinciding with their values obtained experimentally. The proof of the FlowVision PC suitability for solving the vaporization of the dispersed phase problem is relevant for numerical studies presented in [3,4] since the correctness of the carbon black production reactor operation evaluation obtained in these works significantly depends on this.…”