Geometry-based macro-tool evaluation of non-moving-part valvular microchannels
Abbreviated Journal Title
J. Micromech. Microeng.
Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Instruments & Instrumentation; Materials Science, Multidisciplinary; Mechanics
An examination of non-moving-part (NMP) microvalves using geometry-based tools is presented. On a microscale, valves without moving parts possess the potential to greatly benefit fluid delivery systems. To improve valve effectiveness, these 'valves'-which are little more than rectangular, multiple-path channels-require configurations that retard reverse-direction flow as much as possible relative to forward-direction flow. Application of current geometry-based macro-tools to the microchannels of interest provides much insight into pressure-loss/flow-rate relationships for these valves. It was observed that for forward flow, macro-tools predict pressure losses quite well. For reverse flow, transition losses at this scale appear too minute to completely describe experimental data. Yet, with a modified model, pressure-loss behavior can follow a somewhat similar trend for the reverse case. With proper consideration, geometry-based macro-tools are shown to provide helpful insight into pressure-loss/flow-rate relationships for NMP microvalves.
Journal of Micromechanics and Microengineering
"Geometry-based macro-tool evaluation of non-moving-part valvular microchannels" (2002). Faculty Bibliography 2000s. 3188.