Abstract
This paper deals with the theory and application of microwave radiation and experimental optimization of microwave radiation for the distribution of temperature field in the irradiated wooden elements. The article describes the experimental work performed at the Faculty of Civil Engineering, in close cooperation with the company S. P. UNI, s.r.o.. Analysis of the research results was to determine the optimal intensity of microwave emitters and the necessary length of exposure to moist building materials microwave radiation with respect to a particular type of a wooden element. A part of the research was divided into several separate experiments. In each experiment the heating under various conditions was carried out on: I.- samples of the same size, but different weight moisture content, irradiated in the same time periods, II.- samples of the same size, same weight moisture content, irradiated for different time periods.
Highlights
Microwave is known as a part of electromagnetic radiation with a frequency from 300 MHz to 300 GHz, corresponding to wavelengths from 1 m to 1 mm
Temperatures reached at a depth are only estimated. It is a heating depth and a distribution of temperature field that has a major impact on the speed and quality of the performed remediation
Where: P energy absorbed per unit volume (W·m-1), f frequency of microwave radiation (Hz) - (2450 MHz), εpermittivity (F·m-1), εdielectric loss factor of the material, E intensity of the electric field inside the material (V·m-1). [1]
Summary
Microwave is known as a part of electromagnetic radiation with a frequency from 300 MHz to 300 GHz, corresponding to wavelengths from 1 m to 1 mm. Microwaves belong to the broad spectrum of electromagnetic waves, which include a visible light region which is governed by Maxwell's equations It is applied, that the vectors characterizing the magnetic and electric fields are in every point and in every moment perpendicular to each other and both are perpendicular to the direction of wave motion (Fig. 1). P energy absorbed per unit volume (W·m-1), f frequency of microwave radiation (Hz) - (2450 MHz), εpermittivity (F·m-1), ε ́ dielectric loss factor of the material, E intensity of the electric field inside the material (V·m-1). It is necessary to realize that water molecules tend to adjust their polarities changing the polarity of the electromagnetic microwave flux This leads to the electromagnetic transformation of energy in kinetic energy. The heating under various conditions was performed on: - samples of the same size, but different moisture content, heated in the same time periods; - samples of the same size, the same moisture content, heated for various time periods; - samples of the same size, the same moisture content, heated in the same time periods, but at different distances from the source of EMW radiation; - samples of the different size, the same moisture content, heated in the same time periods; - samples composed of several layers
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