Abstract
This paper presents the application of pressure-sensitive paint technique on microscale pressure measurements to investigate asymmetric flow in constricted PDMS microchannels. The deflected flow pattern behind the constricted structure has been revealed by the pressure map with detailed resolution around 3.7 Pm acquired by PSP measurement using microscopy setup. The pressure distributions behind the rib deviates 2.5 kPa at the locations of y=±0.15W at Reynolds number of 279 with constriction ratio 5:1 in the microchannel.