2021 年 20 巻 4 号 p. 243-247
A Scale modeling was derived by Emori (Professor Emeritus, Seikei University) based on traffic engineering. A model experiment is to investigate the phenomenon by replacing a simple system due to a complex phenomenon. When a scale model is applied, the consideration coming from extrapolation is often conducted. Basically, extrapolation is inadequate for dealing with experimental data. However, scale models are considered to include substantial reasons for extrapolation to some extent. The useful range of certain scale models is examined in this article. In addition, the concept of energy π number is suggested. The energy π number is a new idea for solid biofuel, and to introduce its characteristics by the strength of materials and combustion behavior to understand new solid biofuel.