scholarly journals Mathematical Simulation of Forest Fuel Pyrolysis in One-Dimensional Statement Taking into Account Soot Formation

Processes ◽  
2021 ◽  
Vol 9 (9) ◽  
pp. 1616
Author(s):  
Nikolay Baranovskiy ◽  
Viktoriya Kirienko
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Programming Language ◽  
Forest Fire ◽  
Forest Fires ◽  
Soot Formation ◽  
Temperature Distributions ◽  
Forest Fuel ◽  
Fuel Pyrolysis ◽  
High Level

Pyrolysis (thermal decomposition) is considered as the most important stage of a forest fire before direct forest fuel ignition. This process is accompanied by soot particle formation. Such particles have a negative impact on public health in the vicinity of forest fires. The purpose of this article was to investigate the heat and mass transfer process occurring in a typical forest fuel element (birch leaf). The pyrolysis and soot formation processes were taken into account, and various forest fire scenarios were considered. Computational experiments were carried out using the high-level programming language Delphi. Heat and mass transfer processes were described by nonlinear non-stationary differential heat conduction equations with corresponding initial and boundary conditions. The differential equations were solved by the finite difference method. Nonlinearity was resolved using a simple iteration. The main results of the research were (1) physical and mathematical models proposed for modeling forest fuel pyrolysis, taking into account soot formation and conditions corresponding to various forest fires; (2) a computer program coded in the high-level programming language Delphi; (3) the obtained temperature distributions over leaf thickness; (4) volume fractions obtained for various components dependent on time and space coordinates. The qualitative analysis of the dependencies showed that the temperature distributions in the birch leaf structure are similar for all forest fire types and differ only in absolute value. The intensity of the soot formation process directly depends on the forest fire type. The presented results should be useful in predicting and assessing forest fire danger, including near the facilities of the Russian Railways.

scholarly journals An Exact Analysis of Heat and Mass Transfer Past a Vertical Plate with Newtonian Heating

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Abid Hussanan ◽  
Ilyas Khan ◽  
Sharidan Shafie
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
Nusselt Number ◽  
Skin Friction ◽  
Heat And Mass Transfer ◽  
Vertical Plate ◽  
Newtonian Heating ◽  
Governing Equations ◽  
Exact Analysis ◽  
Temperature Distributions

An exact analysis of heat and mass transfer past an oscillating vertical plate with Newtonian heating is presented. Equations are modelled and solved for velocity, temperature, and concentration using Laplace transforms. The obtained solutions satisfy governing equations and conditions. Expressions of skin friction, Nusselt number, and Sherwood number are obtained and presented in tabular forms. The results show that increasing the Newtonian heating parameter leads to increase velocity and temperature distributions whereas skin friction decreases and rate of heat transfer increases.

Mechanisms of Heat and Mass Transfer in the Localization of Ground Forest Fires with the Use of Barrier Strips

2021 ◽  
Author(s):  
G. V. Kuznetsov ◽  
D. V. Antonov ◽  
I. S. Voitkov ◽  
A. G. Islamova ◽  
S. S. Kropotova ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Forest Fires ◽  
Barrier Strips

The Dynamics of Surface Forest Fire and Forest Fuel Ignition Under the Heat Radiation From the Fire Line

2020 ◽  
pp. 1-47 ◽  
Author(s):  
Pavel Nikolaevich Goman
Keyword(s):  
Moisture Content ◽  
Forest Fire ◽  
Analytical Solutions ◽  
Forest Fires ◽  
Heat Load ◽  
Heat Radiation ◽  
Natural Ecosystems ◽  
Fire Dynamics ◽  
Forest Fuel ◽  
Special Computer Program

The chapter presents the results of experimental-analytical modeling of the surface forest fire dynamics and the process of forest fuel ignition when exposed to thermal radiation from the fire line. The regularities are established for the occurrence and spread of fires in natural ecosystems of the temperate climatic zone. Analytical solutions have been obtained that make it possible to predict the level of heat load on the soil cover of coniferous stands. The special computer program has been developed to calculate the heat load during fires. The methods of field and laboratory modeling revealed patterns of forest fuel heating and ignition depending on moisture content. A practice-oriented method is proposed to calculate the width of fire barriers that limit the spread of forest fires. The methods for creating fire barriers are proposed.

The effect of community and company participation and implementation of good forest fire governance on the forest fire policy in Indonesia

2019 ◽  
Vol 10 (1) ◽  
pp. 102-115 ◽  
Author(s):  
Adji Achmad Rinaldo Fernandes ◽  
Raffles Brotestes Panjaitan ◽  
Solimun Solimun
Keyword(s):  
Forest Fire ◽  
Forest Fires ◽  
Good Governance ◽  
Least Squares Method ◽  
Descriptive Analysis ◽  
Survey Method ◽  
Fire Policy ◽  
Forest Zone ◽  
Content Type ◽  
High Level

Purpose The purpose of this research is to analyze the effect of community and company participation on corporate governance and forest fire prevention in the forest zone, which has a high level of vulnerability to forest fires, in Indonesia. Design/methodology/approach The survey method in this research used a quantitative approach with the survey method, with the sample being forest areas having a high level of vulnerability to forest fires in Indonesia. This study used a questionnaire instrument and was conducted from January to March 2017. The research population was 105 villages located in forest areas in six major provinces known to endure the largest forest fires in Indonesia. From a total population of 258 villages, 52 were selected for this study. The proportional random sampling area technique was used. The data analysis methods selected in this research were descriptive analysis and inferential statistical analysis using the partial least squares method. Findings Community and company participation has a significant effect on the implementation of good governance. The implementation of good governance has a significant effect and community and company participation has no direct effect on the forest fire policy, but through good governance mediation, an indirect effect of community participation on the forest fire policy is seen. Originality/value No previous research has comprehensively studied the role of community and company participation and implementation of good forest fire governance on the forest fire policy.

scholarly journals Modeling of heat and mass transfer in LaNi5 matrix during hydrogen absorption-desorption cycle

2012 ◽  
Vol 14 (3) ◽  
pp. 71-76 ◽  
Author(s):  
Olaitan L Akanji ◽  
Andrei V Kolesnikov
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Metal Hydride ◽  
Porous Metal ◽  
Axial Direction ◽  
Packed Bed ◽  
Porous Matrix ◽  
Packed Bed Reactor ◽  
Temperature Distributions ◽  
Desorption Cycle

Packed bed reactors using metal hydride are attracting a lot of attention as potential hydrogen storage systems. Some operational and design variables are major constraints to obtain a proper infl ow/outfl ow of hydrogen into a metal hydride reactor. These variables include packed bed thermal conductivity, porosity, pressure and temperature distributions in the reactor during the absorption/desorption cycle. They also cause a mechanical stress induced by temperature gradient. In this paper, two dimensional models are implemented in COMSOL multiphysics to simulate the hydrogen fl ow, pressure and temperature distributions in the packed bed reactor during absorption/desorption cycle. Also, stresses in porous metal hydride induced by temperature variation in the heating/cooling cycle were evaluated. A possible effect of stress induced, porosity changes on diffusion and heating of hydrogen in both radial and axial direction in packed bed is discussed. The model consists of a system of partial differential equations (PDE) describing structural mechanics of stress, heat and mass transfer of hydrogen in the porous matrix of the packed bed reactor.

scholarly journals Forest Fuel Drying, Pyrolysis and Ignition Processes during Forest Fire: A Review

Processes ◽  
2022 ◽  
Vol 10 (1) ◽  
pp. 89
Author(s):  
Nikolay Viktorovich Baranovskiy ◽  
Viktoriya Andreevna Kirienko
Keyword(s):  
Mathematical Modeling ◽  
Forest Fire ◽  
Forest Fires ◽  
Forest Ecosystems ◽  
Modern Society ◽  
Living Things ◽  
Forest Fuel ◽  
Key Features ◽  
Prediction Systems

Forest ecosystems perform several functions that are necessary for maintaining the integrity of the planet’s ecosystem. Forest fires are thus a significant danger to all living things. Forest fire fighting is a foreground task for modern society. Forest fire prediction is one of the most effective ways to solve this urgent issue. Modern prediction systems need to be developed in order to increase the quality of prediction; therefore, it is necessary to generalize knowledge about the processes occurring during a fire. This article discusses the key features of the processes prior to forest fuel ignition (drying and pyrolysis) and the ignition itself, as well as approaches to their experimental and mathematical modeling.

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