THERMAL DIFFUSIVITIES OF GEOMETRICAL OBJECTS SUBJECTED TO COOLING

This paper presents a new mathematical model for determining thermal d iffusivities of very common solid geometrical objects such as an infin ite slab, infinite cylinder, or sphere cooled in a medium. In practice the model will be implemented by using the center temperature measure ments of these solid objects, and then the cooling coefficients will b e obtained. The cooling coefficient, which is the most important proce ss parameter, has a strong effect on the thermal diffusivity. An illus trative example of the use of the model is presented. In addition, new characteristic equations of the transient heat transfers for these ge ometrical objects were developed. The results of this study show that the present model can be considered as a simple and efficient tool for determining thermal diffusitivies of geometrical objects subjected to cooling.