Heat transfer measurements in a rotating two-pass square channel

The aim of the present work is to perform detailed measurements of the convective heat transfer coefficient map nearby an 180-deg sharp turn in a rotating square channel by means of infrared (IR) thermography. Measurements are performed in order to study the effects of rotation on the heat transfer distribution in the internal cooling passages existing in the blades of modern gas turbine. Results are reported either in local form, or as averaged Nusselt number profiles along the channel. Data shows different behaviors of the convective heat transfer coefficient distribution in the stationary channel with respect to those of the leading and of the trailing walls of the rotating channel.

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