NON-STATIONARY HEAT AND MOISTURE TRANSFER INTERCONNECTED PROCESSES IN PLANT MATERIALS MODELING IN CONDITION OF MILLIMETER-WAVE ELECNROMAGNETIC FIELDS IMPULSE INFLUENCE

Abstract

On the basis of the theory of interconnected heat and mass transfer during phase transformations, as developed by A.V. Lykov (together with his students) with the help of methods of thermodynamics of irreversible processes, a system of differential equations in partial derivatives (for one-dimensional case)was proposed, which has a hyperbolic mass transfer equation taking into account the final value of mass transfer rate. In this paper, heat transfer is described by the equation, which adequately simulates the mentioned process within the quasi-stationary temperature fields. This approach is fair for modeling the processes of heat and mass transfer in plant materials under conditions of combined supply of energy under the action of constant and pulsed fields of millimeter range (the so-called extremely high-frequency range (EHF-band) with the carrier frequency GHz), as processed by short wave pulses. The non-stationary fields of moisture content (mass transfer) excited by video pulses in these media (bodies) and materials are presented analytically due to accurate periodic and non-stationary solutions of the heat-and-mass transfer equations obtained directly in the time domain outside the Fourier series, by analogy with the known results of A.B. Schwarzburg. The results obtained in this work can be further used to improve and refine engineering methods for calculating the parameters of diagnostic equipment, which is used to determine the characteristics of the vegetation cover of fields for agricultural purposes, when designing highways and overpasses in a rugged terrain, as well as while developping such devices and during exploitation of such equipment.