Characteristics of heat and mass transfer at ignition of a thin film of condensed liquid substance by hot particles of different configuration

Abstract

Characteristics of a complex of heat-mass transfer processes with phase transitions and chemical reaction are numerically investigated at ignition of a thin film of typical liquid condensed substance by single hot metal particles shaped as a hemisphere, disc, and parallelepiped. The influence of a source configuration with a limited energy content on the ignition delay time of liquid is estimated. The ranges of heat source parameters at which the influence of the source configuration on the ignition delay time is minimal are determined.

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

“…Thus, for instance, at Θ = 1, ignition occurs only at ≥ 0.05 and ≥ 0.15. The previous study of [21] has determined the configurations of energy sources for which the durations of delay are minimal (particles shaped as a parallelepiped) and for which the processes of ignition are characterized by the maximal sluggishness (particles shaped as spheres and hemispheres). The statement of the problem of heat and mass transfer with particles shaped as cylindrical disks is specified by average [21] values of the integral characteristics of ignition in comparison with particles shaped as a parallelepiped or a sphere.…”

“…The previous study of [21] has determined the configurations of energy sources for which the durations of delay are minimal (particles shaped as a parallelepiped) and for which the processes of ignition are characterized by the maximal sluggishness (particles shaped as spheres and hemispheres). The statement of the problem of heat and mass transfer with particles shaped as cylindrical disks is specified by average [21] values of the integral characteristics of ignition in comparison with particles shaped as a parallelepiped or a sphere. Consequently, in the model under consideration (Figure 1), the dependencies of on Θ and ( Figure 5) characterize the upper and lower estimations of the ignition time delay for systems of particles shaped as a parallelepiped and a sphere, respectively.…”

Water evaporation particularities in the process of forest fire extinguishing

“…(1)- (3) with initial and boundary conditions (4)-(10) was solved by using the methods and algorithms described in [4][5][6][7].…”

Fire Danger of Interaction Processes of Local Sources with a Limited Energy Capacity and Condensed Substances

“…Complete physical settings and mathematical models of investigated processes are presented in works [1][2][3][4]. The principal difference is the conditions of ideal contact and the lack of direct contact between energy source and liquid condensed substance.…”