The present paper deals with an experimental investigation on the conjugate heat transfer in a straight. non-rotating rib-roughened cooling channel. The geometry and flow Reynolds number are representative of those encountered in a modern gas turbine. The hot wall, including the rib, surface temperature distribution is measured by means of an Infra-Red imaging system. The conduction pattern through the wall thickness is calculated by means of the commercial code Fluent®. This combination allows the determination of the real local wall heat flux and enhancement factor in order to investigate the effect of the conduction-convection coupling. The results are compared with those obtained from a more classical, purely convective experiment, putting in evidence the real contribution of the ribs in the heat transfer pattern. A detailed uncertainty analysis, taking into account the combination of the experimental and numerical approaches, supports the results. In addition to a better understanding of the rib effect in the heat transfer pattern, the present data also complement an already well documented test case for numerical analysis validation.

This content is only available via PDF.
You do not currently have access to this content.