Research of Macroscopic Regularities of Heat and Mass Transfer at the Ignition Condition of a Liquid High-Energy Material by an Immersed Source with a Limited Energy Capacity

Abstract

We carried out a numerical and experimental investigation of heat and mass transfer at the ignition condition of a liquid highenergy material by a typical immersed source with a limited energy capacity, being a small, intensely heated metallic particle. The numerical research is made on the basis of a model taking into account a group of interrelated physicochemical processes (thermal conductivity, diffusion, convection, mixing, and radiative heat transfer) with phase transitions (evaporation of the liquid and crystallization of the particle's material). We established such terminal conditions for the immersion energy source that prevent inflammation of the high-energy material.

Mathematical modeling of heat and mass transfer processes at the ignition of a liquid condensed substance by an immersed hot particle

“…Thermophysical characteristics of gasoline and its vapors, steel particle, air and water vapors 01025-p. 4 depending on temperature were chosen similarly to [10,12]. Results of theoretical investigations are presented at…”

“…(1)- (7) was similar to one used in papers [10][11][12]. This system of equations with initial and boundary conditions was solved by the finite difference method.…”

“…This result can be explained by more difficult heat and mass transfer mechanisms for liquids in comparison with solids, and absence of experimental data. Nowadays results of theoretical investigations of ignition processes of typical liquid fuels by single heated till high temperatures steel particle are known [10][11][12]. A few factors influencing on heat transfer characteristics at the ignition were not considered at these papers.…”

Numerical study of heat and mass transfer during ignition of thermal decomposition products of a coal particle

“…Two ignition criteria were used. Their application was well tested at the solution of ignition problems for solid [1], liquid [2] and gel [3] fuels:…”

“…The gas mixture temperature in the zone of exothermal reaction is greater than the initial air temperature T g . The basic elements of heat and mass transfer models at ignition of solid [1], liquid [2] and gel [3] condensed substances were used in the mathematical model development for investigating heat and mass transfer process. A formulated differential equation system of heat and mass transfer describes non-stationary processes of coal heating and thermal decomposition, devolatilization and gas mixture oxidation by oxygen.…”