Abstract
In this work, the molecule-based pressure sensor technique was applied in the microscale pressure measurements to investigate the flow fields inside straight and constricted PDMS microchannels. The pressure distributions inside these microchannels were acquired at Reynolds number ranging from 9 to 78 and Knudsen number changing from 0.0001 to 0.021. The experimental results acquired in the straight microchannel showed good agreement with the analytical solution. The results acquired in the constricted microchannel showed the pressure drop near the constricted area which indicated the flow recirculation.