Thermal Conductivity of Wood-Based Cellular Structures
Journal Title: Lesnoy Zhurnal (Russian Forestry Journal) - Year 2020, Vol 10, Issue 1
Abstract
A physical model is developed for heating a set of laminated cellular structure formed from peeled veneer, dependences for determining its thermal conductivity under conditions of non-stationary heat transfer are proposed. It was found that for a package of 11 layers of birch veneer 2 mm thick, the thermal diffusivity is 1.93∙10–6 m2/s. Based on the fundamental theory of thermal conductivity of the wood substance, dependencies are obtained for calculating the duration of bonding of heat-insulating materials of a cellular structure. It has been established that the duration of gluing of a 22 mm thick plywood mesh slab of peeled birch veneer under pressure exposure is 14.5 minutes at a temperature of press plates 110 °C. The thermotechnical characteristics of the new wood-based cellular structure material were determined: the thermal conductivity coefficient of a cellular plywood board with a density of 530 kg/m3 was 0.081 W/(m·K), the strength under static bending of the board parallel to the fibers of the outer layers was 14 MPa, and perpendicular to the fibers was 10 MPa. The use of underutilized soft broadleaved species with low operational properties as a heat-insulating material, where high strength indicators are not required, is justified, since its thermal conductivity is two times lower than that of a similar material – solid plywood board.
Authors and Affiliations
A. A. Lukash, N. P. Lukutsova
Keywords
Related Articles
- EP ID EP683253
- DOI 10.37482/0536-1036-2020-1-146-153
- Views 527
- Downloads 0
Force Analysis of a Single Grain Cutting Process in Wood Grinding Using Spherical Corundum
The productivity of the wood grinding process can be increased by using abrasive wheels with spherical corundum grains. They also expand the area of application of rigid abrasive instruments by reducing soiling and elimi...
Hydromelioration in Forestry: History of Research
Wetlands cover more than 220 mln ha of Russia’s forests. Swamps alone represent more than 100 mln of them. There are low-quality and low-yield stands on waterlogged areas. Much of such land is treeless. Many years of hyd...
Edge Effect in Pine Stands in the Northern Taiga
The studies are carried out in pine stands situated on the forest boundaries, which are in between the open space locations and forest growth areas. The investigations were made on the territory of the Kholmogorskiy and...
Evaluation of the Accuracy of Wood Drilling Resistance Measurement Method in Dendrochronological Studies
One of the promising methods for determining physical and mechanical properties and structure of wood is the method based on the measurement of drilling resistance. Limitations of application of the method of measuring d...
Creation of Forest Cultures of Crimean Pine (Pinus pallasiana D. Don) on the Hilly Sands in the Steppe Zone of Russia
Forest crop cultivation of Crimean pine (Pinus pallasiana D. Don) was implemented in 2009â2020 on sandy and sand included soils in the steppe zone of the European part of Russia. During the analysis of the reasons for...