Impingement Cooling Experimental Investigation Using Different Heating Elements

Results obtained with the two heating elements show that surface roughness has a significant effect on heat transfer, the steel mesh coated surface providing up to 15.6% higher area averaged Nusselt values with respect to the Inconel coated one. The application of a thin non conducting film over the mesh reduces surface roughness and causes Inconel and mesh to provide coherent results, thus providing a validation for the second method.