Abstract
A numerical investigation of heat and mass transfer processes at the heating of combustible liquid was carried out at the interaction of small-size steel particle with gasoline. Developed mathematical model considers at two-dimensional statement thermal conduction, thermal convection, transfer of energy by phase change (evaporation of liquid fuel and crystallization of particle material), partial immersion of particle in liquid fuel, forming of vapor gap between particle and liquid fuel, diffusion of fuel vapors in oxidizer, dependence of thermophysical characteristics of interactive substances on temperature. It was established that the highest rates of heat and mass transfer processes in a system hot particle - gasoline - air are possible at temperature of particle higher than melting temperature of it material due to the additional heat released at the crystallization of material.
Highlights
Heating, evaporation and ignition of liquid condensed substances drops at contact with hot plate are strongly investigated [1,2,3,4,5,6]
Developed mathematical model considers at two-dimensional statement thermal conduction, thermal convection, transfer of energy by phase change, partial immersion of hot particle in liquid fuel, forming of vapor gap between hot particle and liquid fuel, diffusion of fuel vapors in oxidizer, dependence of thermophysical characteristics of interactive substances on temperature
It was established that the highest rates of heat and mass transfer processes in a system “hot particle – gasoline – air” are possible at temperature of hot particle higher than melting temperature of it material due to the additional heat released at the crystallization of material
Summary
Evaporation and ignition of liquid condensed substances drops at contact with hot plate are strongly investigated [1,2,3,4,5,6] Such interest can be explained by absence of information about main regularities of interconnected heat and mass transfer processes. Interaction processes between heated particles formed at cutting, welding and friction of metals with solid and liquid combustible substances are significant processes from the point of industrial safety. These processes are characterized by high rates of chemical reactions, heat and mass transfer, small sizes and high temperatures of energy sources, high fire density. Mathematical model of process considers two-dimensional heat and mass transfer, kinetics of evaporation and ignition processes, crystallization of hot particle material, partial immersion of hot particle in liquid fuel, forming of vapor gap between hot particle and liquid fuel, and dependence of thermophysical characteristics of substances on temperature
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