Thermographic investigation of some surface flow patterns

Infrared (IR) thermography, due to its two-dimensionality and non-contact character, can be usefully employed in a vast variety of heat transfer industrial applications as well as research fields. The present work deals with measurements of temperature and/or convective heat transfer coefficients in several types of fluid flow configurations studied by means of the IR scanning radiometer applied to the heated-thin-foil technique. In more details, it is analysed the capability of the infrared system to study particular phenomena such as: the heat transfer, including the spiral vortical structures developing at transition, over a disk rotating in still air; the thermal exchange enhancement induced by a jet centrally impinging on the rotating disk; the complex heat transfer pattern associated with a jet in cross-flow.