Experimental study of the temperature field in the soil layer when heated by ultrahigh frequency radiation

The use of non-ionizing radiation in agro-industrial production is a promising environmentally friendly alternative solution for pest, disease and weed control. The main purpose of the research is the development and use of technologies and devices for its implementation. In the course of the study, a device was developed to disinfect the soil with ultrahigh-frequency radiation, the source of which is magnetrons with a radiation frequency of 2450 MHz and a power consumption of 800 to 1000 watts. The radiation energy is applied to the soil surface by a waveguide measuring 90 × 60 mm. Cardboard boxes with soil samples 200 mm long, 50 mm wide and 100 mm deep were used as microwave radiation receivers. The thermal imager Testo 882 was used to determine the temperature distribution in the soil layer operated by to the device. Thermography was performed at soil humidity of 4, 10, 15 and 20%. In order to determine the effect of reflected radiation on soil heating, an aluminum plate with a thickness of 1 mm was placed in the soil layer. The study revealed that at an exposure of 60 s, the soil layer heats up to 60 to 65°C to a depth of 25 to 35 mm, to 40 to 45°C to a depth of 90 to 100 mm. At the same time, soil moisture does not significantly affect its heating rate. The efficiency of microwave radiation and heating is still higher when a metal plate is placed under the soil layer, while up to 87% of the energy consumed by the device is accumulated by the soil layer.

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