The behavior of micro-scale flow is significant for the performance of Micro-Electro-Mechanical-Systems (MEMS) devices. Some experiments about liquid flow through microtubes with diameters about 3∼20μm are presented here. The liquids used in our experiments include some simple liquids with small molecules, such as non-ion water and several kinds of organic liquids (CCL4, C6H5C2H5 and Isopropanol etc.). The flow rate and the normalized friction coefficients were measured in micro-flow experimental apparatus. The results show that when the driven pressure varies from 0 to 1Mpa, the flow behaviors in 20μm microtube for both polar and non-polar liquids are in agreement with Hagen-Poiseuille law of the classical theory. It means that N-S equation based on continuous medium still acts well in this case. For higher pressure drop from 1 to 30Mpa, in the microtubes with diameter of 3∼10μm, the normalized friction coefficients of organic liquids can’t keep constant with pressure increases. However the non-ion water reveals different trends.
- Nanotechnology Institute
Experiments About Simple Liquid Flows in Microtubes
Li, Z, & Cui, H. "Experiments About Simple Liquid Flows in Microtubes." Proceedings of the ASME 2003 1st International Conference on Microchannels and Minichannels. 1st International Conference on Microchannels and Minichannels. Rochester, New York, USA. April 24–25, 2003. pp. 759-763. ASME. https://doi.org/10.1115/ICMM2003-1099
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