FIELD: measuring technology.
SUBSTANCE: invention relates to measuring technology and can be used in the study of mass transfer processes and to determine the diffusion coefficients of solvents in orthotropic capillary-porous materials in paper, light, construction and other industries. The method for determining the diffusion coefficient of solvents in sheet orthotropic capillary-porous materials consists in the fact that a uniform initial content of the solvent distributed in the solid phase is created in the test sheet material, then the test material is placed on a flat substrate made of a solvent-impermeable material, the upper surface of the material is waterproofed, the initial moment of time, impulse moistening of the test material is carried out in a straight line by a moving source of solvent of constant productivity in a given direction of the orthotropic material, the electrodes of the galvanic converter are made in the form of straight segments and placed on both sides of the pulsed humidification line on straight lines parallel to the pulsed humidification line, and on the same a predetermined distance from it, fix the moment of reaching the predetermined value of the signal of the galvanic sensor and calculate the diffusion coefficient. At the same time, the change in time of the signal of the additional galvanic sensor is measured, the rectilinear electrodes of which are located at a different distance from the line of applying the pulse with the solvent dose, the time points τ1 and τ2 are fixed, at which the same values of the signals of the first sensor E1 and the second sensor E2 from the range (0.7–0.9)Ee on the descending branches of the curves of changes in the signals over time for these two sensors.
EFFECT: improving the accuracy of measuring the diffusion coefficient of solvents in sheet orthotropic capillary-porous materials.
1 cl, 1 dwg
