STUDY OF THE PINE TREE THERMAL BEHAVIOUR NEARBY A FOREST FIRE ENVIRONMENT
Published In: 3RD INTERNATIONAL E-CONFERENCE ON ENGINEERING, TECHNOLOGY AND MANAGEMENT
Author(s): DOMINGOS XAVIER VIEGAS , EUSéBIO CONCEIçãO , JOãO GOMES , JORGE RAPOSO , MARIA MANUELA LúCIO , G. ARANDA-BOJORGES , ARIA MANUELA LúCIO, MARIA TERESA VIEGAS
Abstract: In this work a numerical model of the pine tree thermal behaviour, nearby a forest fire environment, is developed and applied. The pine tree thermal behaviour numerical model is based on energy balance integral equations for the tree elements and mass balance integral equations for the water in the tree elements. The numerical model considers the heat conduction through the tree elements, heat exchanges by convection between the external tree surfaces and the environment, heat exchanges by radiation between the flame and the external tree surfaces and water heat loss by evaporation from the tree to the environment. The numerical simulation applied in this study considers the mean fire front temperature of 500ºC, the air temperature of 40ºC, the air velocity of 10 m/s and the air relative humidity around the pine tree of 50%. The Mean Radiant Temperature (MRT) and the external surface temperatures, that each element (trunks, branches and leaves) of the pine tree is subjected, were cal
- Publication Date: 27-Sep-2020
- DOI: 10.15224/978-1-63248-190-0-11
- Views: 0
- Downloads: 0
DEVELOPMENT OF A VIRTUAL PINE TREE GEOMETRY USED IN THE RADIATION HEAT EXCHANGES WITH A FIRE FRONT
Published In: 3RD INTERNATIONAL E-CONFERENCE ON ENGINEERING, TECHNOLOGY AND MANAGEMENT
Author(s): DOMINGOS XAVIER VIEGAS , EUSéBIO CONCEIçãO , JOãO GOMES , JORGE RAPOSO , MARIA MANUELA LúCIO
Abstract: In this work the geometry of a virtual pine tree was developed. This geometry, applying mesh generation, is used to evaluate the view factors, used to calculate the heat exchanges by radiation, between the virtual pine tree and a fire front. The virtual pine tree geometry, developed using a three-dimensional tree model, has a height of 7.5 m and is constituted by 8863 cylindrical elements. The virtual pine tree geometry is built by trunks, branches and leaves. The fire front has 10 m long and 1 m high. The distance between the virtual pine tree geometry and the fire front is 5 m. The virtual pine tree geometry is divided in four levels. Each level is built with 8 radial trunks, 24 branches and 2160 radial leaves. Between each level a vertical trunk is considered. In the top of the last level a vertical branch with 90 radial leaves is considered. The numerical results of the geometry, mesh generation and the view factors are represented and calculated. The view factors between the virtu
- Publication Date: 27-Sep-2020
- DOI: 10.15224/978-1-63248-190-0-12
- Views: 0
- Downloads: 0