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The objective of this study is to investigate the influence of the inlet flow velocity on local heat transfer mechanisms in a single finned tube assembly. Within this framework, an Infrared Thermography technique was used to determine the convection heat transfer coefficient distribution in front of the tube, then results were confronted to the flow structure obtained using a PIV system by M. Nacer-Bey [1]. Flow velocity is found to have a considerable effect; as it increased, horseshoe vortices size and intensity increased causing thermal peaks augmentation. We distinguish a separating zone whose size is depending on Reynolds number and characterised by a high heat transfer. Also, the position of both horseshoe vortices and their associated thermal peaks was studied. Results are analysed and correlations between heat and momentum transfer are highlighted.

Infrared Thermography study of the local heat transfer coefficient in front of a single finned tube