Approach to laminar phenomena occurring on external and internal surfaces of solid specimens

Abstract

This article presents a general mathematical model for describing the laminar transport phenomena during homogeneous/heterogeneous appearances in the neighborhood of external and internal surfaces of small solid specimens. The model employs an original concept to solve the governing partial differential equations in order to predict the momentum, heat and/or mass transfer at the observed solid surface as well as diffusion at and/or into solid. Therefore, an approach established on the simplified form of fundamental partial differential equations is described. On the basis of this equation the integral method procedure, reduced to balance setting of Flux Gradients (FG-codes) of the transfer phenomena that occur, is derived. A steady-state flow and an un-steady state non flow situation are evaluated. Also, determination of activation energies of observed phenomena are discussed. Examples of verification are listed.