Desenvolvimento de técnicas de problemas inversos em convecção de calor

Abstract

This work presents an experimental technique to the heat flux estimation on a vertical plate heated relative to an ambient fluid. The heat flux components are obtained from using temperature measurements inside of the fluid. The energy, momentum and overall continuity equations describe the laminar free convection problem. The direct solution of the boundary layer equations is obtained analytically using the von Kármám-Pohlhausen method. For this, hypothesis like stead state, two-dimensional flow and the Boussinesq approximation are assumed. Three inverse problem techniques are applied. Two of them are based on a sequential function specification while the other is based on genetic algorithm. An experimental apparatus is designed to establish the completely developed boundary layer on the vertical plated heated and to measure the temperatures inside the fluid. An analysis of the main error sources in the process is presented. It is also presented a sensitivity coefficients analysis to indicate the optimum temperature sensors location.