Semi-analytical modeling of non-premixed counterflow combustion of metal dust
| Autor: | Mehdi Bidabadi, Nafiseh Mohammadian Aftah, Abolfazl Afzalabadi, Seyed Amir Hossein Madani |
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| Rok vydání: | 2018 |
| Předmět: |
Buoyancy
Partial differential equation Materials science Equations of motion Autoignition temperature 02 engineering and technology Mechanics engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics Combustion 01 natural sciences Lewis number 010406 physical chemistry 0104 chemical sciences Physics::Fluid Dynamics Drag engineering Particle Physics::Chemical Physics Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | Journal of Thermal Analysis and Calorimetry. 137:501-511 |
| ISSN: | 1588-2926 1388-6150 |
| Popis: | In this study, a semi-analytical model is developed for non-premixed combustion of metal dusts in counterflow configuration. Combustion domain is divided into three separate zones, each of which possesses corresponding mass and energy conservation equations as well as boundary and jump conditions. Metal dust, assumed to be aluminum, undergoes an Arrhenius-type reaction with oxidizer, when it is heated enough to reach the ignition temperature. Dimensionless forms of conservation equations are derived and utilized to elucidate the combustion characteristics. The effects of oxidizer Lewis number and fuel mass concentration on the flame position and temperature are discussed thoroughly. In addition, temperature distribution of the whole domain is calculated by numerically solving the system of partial differential equations. In order to track particles through combustion domain, Lagrangian equations of motion are solved either mathematically or numerically, considering thermophoretic, weight, buoyancy and drag forces. The effects of thermophoretic force on the particle path are investigated, and the deviation of particle from carrier neutral gas direction is obtained. The results showed a great agreement with the data reported in the literature highlighting the fact that the presented model is an efficient one to accurately model the non-premixed counterflow combustion of metal dust. |
| Databáze: | OpenAIRE |
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