Heat and mass transfer in laminated glued timber bar
| Autor: | Lubov Gnedina, Aleksandr Ibragimov, Nikita Ushakov, Konstantin Popkov, Ksenia Zaytseva |
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| Rok vydání: | 2021 |
| Předmět: |
lcsh:GE1-350
Materials science 0211 other engineering and technologies 02 engineering and technology Mechanics 010501 environmental sciences Inverse problem 01 natural sciences Nonlinear system Heat flux Perfect thermal contact Mass transfer Glued laminated timber Heat transfer 021108 energy Boundary value problem lcsh:Environmental sciences 0105 earth and related environmental sciences |
| Zdroj: | E3S Web of Conferences, Vol 244, p 09009 (2021) |
| ISSN: | 2267-1242 |
| DOI: | 10.1051/e3sconf/202124409009 |
| Popis: | The main prerequisites for the development of wooden housing construction in Russia are given, which determined the goal of this study - to develop a mathematical model of heat and mass transfer (moisture transfer) in glued timber for rational design of enclosing structures. Lamellas can be classified as a capillary ‒ porous body. leaning on theory of academician A.V. Lykov, the formulation of the problem of heat and mass transfer in a multilayer glued laminated timber is presented a system of equations describing non-stationary heat, mass and pressure transfer under real possible operating conditions of enclosing structures is considered. An analytical method is proposed for calculating both individual lamellas and the entire multilayer glued beam. The proposed technique allows the method of solving the inverse problem to directly calculate the resistance value of the entire bar from the unsteady temperature field. The system of equations describing the process is nonlinear and analytically insoluble. To solve the problem, a combined method for solving boundary value problems of heat transfer was used, which is based on a combination of elements of analytical and numerical solutions. A feature of the problem under consideration is that the middle lamella has heat-conducting inclusions in the form of a bough. Method is that the entire heat transfer process is divided into a number of small time intervals. Within each interval, we assume that the temperature is constant at the interface between layers and a constant heat flux through the contacting surfaces, i.e. perfect thermal contact. |
| Databáze: | OpenAIRE |
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