CONJUGATE GRADIENT METHODAPPLIED TO INFRARED THERMOGRAPHIC DATA FOR THE INVERSE ESTIMATION OF THE CONVECTIVE HEAT TRANSFER COEFFICIENT

The conjugate gradient method formulated with the adjoint problem is here employed to solve the 2-D Steady State linear Inverse Heat Conduction Problem with the aim of estimating the local convective heat transfer coefficient on a given surface by using the temperature distribution, acquired by an infrared acquisition system, as input data. This solution technique, already successfully adopted in literature for the Unsteady formulation of the Inverse Heat Conduction Problem, is here newly applied to state state tempertaure maps in order to restore the local heat transfer performance of a surface in a turbulent channel air flow by reconstructing the local energy balance in the wall.