METHOD FOR MODELLING THE PROCESS OF HEAT AND MASS TRANSFER WHEN EVAPORATING LIQUID FROM A TRANSPARENT CONTAINER AND APPARATUS FOR IMPLEMENTATION THEREOF Russian patent published in 2022 - IPC B01J19/00 G01N29/02 

FIELD: drying.

SUBSTANCE: inventions relate to production processes related to drying various products. Proposed is a method for modelling the process of heat and mass transfer when evaporating model liquid (ML) from the experimental sample (ES), based on executing energy impact with preset parameters for an ES with ML, measuring the temperature at different points of ES; laser emission (LE) in a set range of wavelengths is used as the energy impact on the ML placed in ES; the temperatures of the ML in the indicator plane perpendicular to the axis of LE in the direction from the centre of the LE beam to the wall of the ES are predetermined, one temperature measuring sensor is used to determine the distribution of temperature values depending on the distance from the centre of LE; the number of temperature measuring sensors in the radial direction is determined based on the condition of temperature difference of the ML, wherein said difference should exceed the value of dual deflection of the used temperature measuring sensor; and in the process of LE, the parameters of impact of LE are measured using a transparent container, including the diameter of LE beam, by determining the diameters of the holes burned from the impact of projection of the beam on the surface of a thin film made of a material with minimum heat capacity, at different distances from the head of the laser emitter, both with and without ML; the results of mechanical impact of LE on the free surface of the ML, including the destruction of the mirror of the free surface of the ML, the amount of bubbles in the ML, the speed and direction of rotation thereof in the ML, are determined by high-speed filming; the power of LE, the power of energy impact of LE, and the initial distance from the surface of LE emitter to the initial surface of the ML are determined based on the condition of minimum ML ejection mass in the process of experiment; the ML is exposed to the impact of LE in pulse mode, with different values of the duration of pulses and the time interval between said pulses, and in continuous mode, wherein the total amount of energy of the impact of LE and the initial mass of the ML are equal; the duration of pulse and the time between pulses are determined based on the condition of minimum heating of the ML in the volume of ES. Also claimed is an apparatus for implementing the method.

EFFECT: reduction in the energy consumption, simplification of experimental research of the evaporation of a model liquid using laser emission.

2 cl, 4 dwg