Local and global measurements of friction coefficient in microchannels
Mesures locales et globales du frottement dans des microcanaux
Résumé
Experiments were performed in 2-D microchannels of varying height from 1 mm to 100 {mu}m. For smooth surfaces of the channels, the results did not demonstrate any scale effect. On the contrary, roughness has been found to have large effects on the laminar regime of micro-flows. In that case, friction factor results are consistently higher than values predicted by macro-scale correlations but exhibit a classical trend Po vs Re. For microchannels of height below 100 {mu}m, we have developed micro-fabricated systems devoted to local pressure measurements and we have successfully tested silicon strain gauges.
