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Experimental investigation of heat transfer over drag-reducing riblets

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The effect of longitudinal and drag-reducing riblets on heat transfer in a turbulent boundary layer is investigated. Systematic previous studies of turbulent flows over ’V’-shaped riblets have shown that a drag-reducing regime is observed when the height of the ribs and their spacing are approximately 15 in wall units [8, 1]. The experimental results presented here indicate that drag-reducing riblets surfaces are also heat-transfer reducing surfaces and suggest that the so-called Reynolds analogy remains valid even with microgrooves over the boundary wall.

Author(s):

Mathieu Creyssels    
Laboratoire de Mécanique des Fluides et d'Acoustique, CNRS, Ecole Centrale de Lyon
France

Christian Nicot    
Laboratoire de Mécanique des Fluides et d'Acoustique, CNRS, Ecole Centrale de Lyon
France