11. Heat Treating a Long Cylindrical Pine Log in Vacuum Available to Purchase

In this chapter, we will investigate heat treatment of a long cylindrical pine log, namely its length is at least ten times its radius, in vacuum. This kind of heat treatment of pine logs reduces its water content and therefore reduces its shrinkage, increases its dimensional stability and improves its decay while reducing its tensile and bending strengths. The pine log has a uniform initial temperature of 20 C. This pine log is treated like an infinite cylinder which suddenly experiences radiation heat transfer in a vacuum oven with a radiation source temperature of 200 C (473 K) and it has a radius, R_o , a length, L and $LRo>10$⁠. Transient temperature of this infinitely long pine log is given as a partial differential equation in cylindrical coordinates in Equation 11-1. See. Ref. [15].