Numerical Study of Heat and Mass Transfer during the Thermal Drying of Tropical Woods

Abstract

A sector of utilization and transformation of wood give much money at the countries of the central Africa region. If we want to increase these advantages, it is important to do locally the first and second transformations of wood. Self-control of the wood drying is necessary to ameliorate a wood quality and to preserve an art work doing in wood. In this article, we are modeling a drying of one piece of bete wood (Mansonia altissima) with dimensions are 1m of length and thickness is no more than 25cm. We have used a literature to obtain a mass and heat equations and the thermophysical properties of the present wood. We have considered some thermophysical properties that we are unkempt in the precedent work [1]. We have experimentally obtained a relationship between a density of this wood with a water content. The others thermophysical properties come from the literature [1,2]. We have simulated a wood drying in the constant conditions and in the conditions of the bete drying table established by CIRAD Organization. A sensibility study is doing to validate a modeling. Then, the present modeling explains temperature, mass fraction of the vapor in air and water content evolutions during the industrial process of drying. This modeling can to be used for to overhaul a drying table of bete wood and the others of tropical woods. This work uses a gaseous pressure can be used to explain the drying with the high temperatures conditions.

Modeling and Simulation of the Drying of Beech Timber (Fagus sylvatica)Using Oscillating Regimes

“…Microsoft Excel is used to process and display the results. The time step and space step are respectively 1700s and 6.25x10 -4 m [19]. Initial temperature of samples is 30°C.…”

Turning to Service, Preliminary Study of a Wood Conventional Semi Industrial Dryer and Cost Price of the Wood Drying in the African Tropical Context

“…Ln(X red )=-6x10 -6 t-0.218 (4b) The time space is good chosen because =-0.21. A good determination of the parameter D is necessary to simulate numerically the conventional and solar dryers [6,7].…”