Micro-Flow Studies in the 1 to 50 Micron Domain
Final rept. Sep 1998-Sep 2001
SADDLEBACK AEROSPACE CORP HUNTINGTON BEACH CA
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This effort addressed fundamental issues in the characterization of the flow and heat transfer behavior of micro-systems while at the same time providing an experimental database to reduce the need for scaling typically 2 -3 orders of magnitude from available macroscopic correlations. The study began with the establishment of sample fabrication and testing techniques, and then progressed to actual thermal and flow measurements on the samples. During the program the following measurements were made Friction factors and transition Reynolds numbers Retransition for 24 straight channels of varying surface roughness, using water, air, and FC-72 Minor loss coefficients Kminor for 4 channels with Wyes. 4 channels with Ts, and 32 channels with bends of varying aspect ratios and sharpnesses, using water, air, and FC-72. Nusselt numbers Nu for 4 channel sizes using water and air Notably. the experimental results showed that the transition Reynolds number and friction factors for smooth ducts gave no indication of any unusual effects at microscales, but that increasing the wall roughness tended to increase the friction factor and reduce the transition Reynolds number.
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