A TECHNIQUE TO ESTIMATE THE TRANSIENT COEFFICIENT OF HEAT TRANSFER BY CONVECTION

摘要

This work aims to the study of the characteristics of the dissipation by convection of a solid circular section of a diameter din a fluid. Specifically, it focuses on the estimation of the transient heat transfer coefficient. It is assumed that the circular section increases its temperature homogeneously over its whole surface from an initial temperature value T-a to the asymptotic temperature value T-m. A new approach is proposed to estimate the heat transfer coefficient in the transient state. Temperature and elasticity analysis were made on several numerical experiments to study the performance of the proposed estimation. Numerical research indicates that the proposed technique allows to obtain a more precise heat transfer coefficient than the usual one, which leads to a better estimate of the temperature profile in the transient state.