Mathematical modeling of wood drying process

Abstract

This work focuses on the development of mathematical models describing moisture movement in wood, when the wood is considered as porous medium. Main moisture transport mechanisms are discussed. It is shown how the wood can be described as a two? or three?phase system. Summaries of several multiphase flow models are presented in the hierarchical order: from the most general models to more simple examples. The approximation steps are described explicitly, and all assumptions are given in detail. It shown how models for specific applications in wood drying or saturation can be obtained.

Medienos d�iovinimo proceso matematiniai modeliai

Santrauka. �iame straipsnyje pagrindinis d?mesys skiriamas dr?gmes koncentracijos kitimo medienoje matematiniam modeliavimui, kai mediena yra nagrin?jama kaip poringa terp?. Yra aptarti pagrindiniai skys?i? jud?jimo mechanizmai, naudojant dvifazius ir trifazius artinius. Sudaryta hierarchin? modeli? sistema, apimanti tiek pa?ius bendriausius modelius, tiek ir j? supaprastintus variantus. Visi modeli? i�vedimo �ingsniai apra�omi i�reik�tiniu b?du, grie�tai suformuluotos toki? modeli? teisingumo prielaidos. Parodyta, kad esant tam tikroms s?lygoms i� �i? modeliu galime gauti gerai �inomus artinius, teori�kai pagristos j? koeficient? i�rai�kos.

First Published Online: 14 Oct 2010

Keyword : wood drying, mathematical models, multiphase flow