Modelling of the 1D Convective Heat Exchange between Logs Subjected to Freezing and to Subsequent Defrosting and the Surrounding Environment

Deliiski, Nencho and Brezin, Veselin and Tumbarkova, Natalia (2015) Modelling of the 1D Convective Heat Exchange between Logs Subjected to Freezing and to Subsequent Defrosting and the Surrounding Environment. ACTA SILVATICA ET LIGNARIA HUNGARICA, 11 (1). pp. 77-88. ISSN 1786-691X

Preview

Text 06_Deliiski_et_al.pdf Download (1MB) | Preview

Abstract

A 1D mathematical model for the computation of the temperature on the surface of cylindrical logs, t sr , and the non - stationary temperature distribution along the radius es of logs subjected to freezing and subsequent defrosting at convective exponentially changing bou n dary conditions has been suggested. The model includ e s mathematical descriptions of the thermal conductivity in rad ial direction,  r , the effective s pecific heat capacity, c e , and the density, ρ, of the non - frozen and frozen wood, and also of the heat tran s fer coefficient between the surro u nding air environment and the radial direction of horizontally situated logs, α r . With the help of the model , computations have been carried out for the determination of α r , t sr ,  sr , and 1D temperature distribu t ion along the radius es of beech logs with diameter s of 0.24 m, initial temperature 20 o C, and moisture content 0.4 kg · kg - 1 , 0.8 kg · kg – 1 , and 1.2 kg · kg – 1 , during their freezing at – 20 o C , and during subsequent thawing at 20 o C.

Actions (login required)

Edit Item