A. N. Golovanov

Determination of the Characteristics of Mass Transfer in Certain Combustible Forest Materials

The main characteristics of moisture transfer (the coefficients of moisture capacity and moisture conductivity) for the most widespread elements of combustible forest materials (CFMs), namely, needles of pine, cedar, and spruce, are found experimentally according to the procedure of A. V. Luikov, which is based on the introduction of a scale of moisture‐transfer potential. The data obtained are compared with the results of other authors. Analysis of the structure of the CFM elements made it possible to establish that complex processes (desorption, adsorption, and osmosis) associated with a change in the fine structure of the needles during their drying occur inside the CFM elements.

Problem of drying of a layer of combustible forest materials

Physical and mathematical modeling of drying of a layer of combustible forest materials (CFMs) is considered in a conjugate formulation within the framework of which the equations of a binary boundary layer and the equations of heat and mass transfer in a layer of combustible forest materials are solved. Boundary conditions for the laws of conservation of mass and energy are written on the interface of media. It is found experimentally and theoretically that the velocities of the flow and radiation strongly affect the time of drying of a layer of combustible forest materials, whereas the effect of the angle of inclination (slope) between the underlying surface and the horizontal plane is insignificant.

Self-excitation of oscillatory processes when a liquid is injected into a plasma jet

The process of cooling of a wall by a liquid injected into a plasma jet through a circular opening is studied experimentally. Different flow regimes in a vaporliquid system, including self-excited oscillatory regimes associated with the transfer of the region of boiling from the exterior side of the wall into the interior cavity of the casing, were obtained. Self-excited oscillations of the wall temperature are described with the help of approximation formulas.

Experimental Investigation of Mechanical Vibrations of the Elements of Combustible Forest Materials

Vibrations of elements of combustible forest materials (CFMs) in a laminar air flow are studied experimentally using optical‐fiber facilities. The elastic properties of combustible forest materials — the Young modulus and the rigidity, whose values in the limiting cases are in satisfactory agreement with the known data — are determined. It is stated that vibrations of combustible forest materials can affect their heat and mass exchange with the environment. The results obtained made it possible to evaluate the limiting value of the equilibrium velocity of wind in the forest cover at which a crown forest fire can originate or die down.