SU1163113A1 - Method of liquid evaporation - Google Patents

Abstract

A method of evaporation of a liquid using an electric discharge, characterized in that, in order to intensify the process of evaporation and expand the field of application, the discharge is created above the evaporation surface and the current density vector is directed at an angle of 180 relative to the normal to this surface. electrodes one relative to the other and the surface of evaporation at a distance of 1-1.5 of the size of the discharge gap. i 05 00 with

Description

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The invention relates to the drying of solid materials or products by removing moisture from them by means of electricity and can be used for drying heat-sensitive materials, medical preparations, and the like.

The purpose of the invention is to intensify the evaporation process and expand the scope.

FIG. 1 shows the electrical circuit of the organization of the electric discharge; in fig. 2 shows the dependence of the depth of the lowering of the liquid level in the capgill p on time for various currents; in fig. 3 shows the dependence of the mass of the evaporating droplet on time for various currents.

The electrical circuit (Fig. 1) consists of electrodes 1 and 2, the tip of the ring. The voltage to the electrodes is supplied with the help of a high-voltage source 3, which makes it possible to obtain a rectified voltage of 1 to 10 kV, through resistors 4, which control the discharge current and the discharge form (1-10 MΩ). Sample 5 containing a current does not flow because the electrodes are located outside the sample surface at a distance commensurate with the size of the discharge gap 6 and the density vector of the discharge current passing between tip 1 and ring 2,. forms with a normal to the sample surface an angle greater than 0 or less depending on polarity.

Curve 1 (Fig. 2) corresponds to zero-directional evaporation of distilled water in a capillary with a diameter of 2.5 m (the current between the electrodes is zero), Curve P — to a discharge current of 4 μA, Curve III — to a current of 70 μA. Similar effects are observed with other liquids: acetone, ethyl alcohol.

2

propyl alcohol, carbon tetrachloride. On the presented dependence (Fig. 3) of the mass of the evaporating droplet (distilled water) located in the area of electrical discharge on a non-wetting fluoroplastic substrate, as a function of time, curve IV corresponds to non-discharge conditions, curve V is current 2.5 µA , curve VI - 15 μA, and curve VII 70 μA.

The table shows the results of measuring the evaporation rate, i.e. the ratio of the mass of distilled water evaporated from the porous body to the period of time during which this mass evaporated. The sample used was titanium porosity of 30%, pore diameter of about A micron.

Discharge in all experiments was carried out at a voltage of 4.5 kV at the source output.

Claims (1)

EVAPORATION PROCESS FLUID using an electric discharge, characterized in that, in order to intensify the process of evaporation, rhenium and expansion region to use Nia, the discharge created above the surface of evaporation and direct current density vector at an angle of 0 <a * <180 ^minutes with respect to normal to the this surface by placing the electrodes one relative to the other and the evaporation surface at a distance of 1-1.5 times the size of the discharge gap. Figure 1 9P99P