FIELD: measuring technology.
SUBSTANCE: invention relates to measuring technology and can be used in the study of mass transfer processes to determine the diffusion coefficient in building products made of capillary-porous materials, as well as in food, chemical and other industries. The method for determining the diffusion coefficient in massive products made of capillary-porous materials consists in creating a uniform initial content of the solvent distributed in the solid phase in the test product, waterproofing the upper flat surface of the sample, at the initial moment of time, pulsed point moistening of the upper surface of the test product is carried out, electrodes of the galvanic converter on this surface along a concentric circle relative to the point of impulse action, the time point of reaching the set value of the signal of the galvanic sensor is fixed and the diffusion coefficient is calculated. At the same time, the change in time of the signal of the additional galvanic sensor is measured, the electrodes of which are located on this surface along a concentric circle relative to the point of impulse action at a different distance from it, 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 are achieved, respectively E2 from the range (0.7–0.9) Ee on the descending branches of the time curves of the signals of these two sensors.
EFFECT: improving the accuracy of measuring the diffusion coefficient of solvents in massive products made of capillary-porous materials.
1 cl, 1 dwg
