Effects of repeating microstructures on pressure drop in rectangular minichannels

Derek Schmitt
Satish Kandlikar

Proceedings of the third international conference on microchannels and minichannels June 13-15, 2005. The complete proceedings can be obtained at www.asme.org . Note: imported from RIT’s Digital Media Library running on DSpace to RIT Scholar Works in February 2014.


A literature review in laminar incompressible flow in microchannels has shown both early and late transitions from laminar to turbulent flow as well as no deviation from the conventional flow transition of Re=2300. In the present work, air and water flow through rectangular channels with hydraulic diameters ranging from 325μm to 1819μm. Smooth surface conditions are tested to validate the test section, while a repeating roughness is used to show the effects of surface roughness and its orientation on flow characteristics in minichannels. Testing has shown that smooth channels show no deviation, while artificially roughened channels show considerable deviation from the macroscale flow transition of Re=2300.