ICA – POSTER 406 Acoustics and Dielectric properties of Borassus Flabellifier ‘ BF ’ with frequency at 308 K .
Dielectric properties of Borassus Flabellifier ‘BF’ wood were carried out by authors with frequency at room temperature 308K. The wood section is taken from ma le BF tree and female BF tree from where the natura l j ice is collected over night. A large variation occurs at f requencies less than 10 Hz. at room temperature 308 K.The dielectric constant decreased as frequency increase d from 1 Hz to 4.0 x10 Hz. The minimum peak value of the dielectric loss tangents shifted towards higher fre quencies at room temperature 308K. Very low dielect ric conductivity has been observed. Characterization of the samples was made by scanning electron microsco pe (SEM) Model JEOL JSM5400. Results shows that the dielectr ic properties are slight different in male and fema le BF wood considerably. The variation of the dielectric const a t in different wood structures is correlated at r oom temperature with the frequency variations in a way the received signal strength. Acoustics measurement were carrie d out in our laboratory using Ultrasonic Interferometer by NDT t echnique and the dielectric measuring device used i n this study at UGC-DAE Consortium for Scientific Research Centr Indore (M.P.) India. In this study the drying of wood done by microwave energy using a continuous microwave dr i r was compared to that by conventional method.
THERMAL AND DIELECTRIC PROPERTIES OF PINE WOOD IN THE TRANSVERSE DIRECTION
In this paper, the thermal conductivity and dielectric parameters for pine [Pinus sylvestris (L.)] woods were determined in transverse directions for moisture conditions from oven-dry to 22 percent at a room temperature of 22 to 24 °C. Results indicate that the behaviors of thermal conductivity and dielectric parameters with moisture content and structural directions were similar. In general, the properties increased within the range studied with increasing moisture content. The radial values were similar to tangential values for both thermal conductivity and dielectric properties. The data presented here should be useful in most design problems where pine wood is subjected to microwave electric fields and heat changes.
Dielectric properties of hardwood species at microwave frequencies
Dielectric measurements at 9.8 GHz and 2.45 GHz were made for the three hardwoods Euramerican hybrid poplar, alder, and oriental beech. The method used was based on Von Hippel’s transmission line method. The measurements were carried out at room temperature of 20°–24°C. The dielectric properties of the wood species were determined for the three principal structural directions at six different moisture conditions, covering the range of 0% to 28% moisture content. Results indicated that the behavior of all wood species studied is quantitatively similar. In general, the dielectric properties increase within the range studied with rising moisture content. The grain direction of the wood also plays a significant role.