caa a22 4500 463235142 CHVBK 20180405153254.0 cr unu---uuuuu 170326e20070601xx s 000 0 eng 10.1007/s10404-006-0129-0 doi (NATIONALLICENCE)springer-10.1007/s10404-006-0129-0 Experiment and simulation of mixed flows in a trapezoidal microchannel [Elektronische Daten] [Keisuke Horiuchi, Prashanta Dutta, Cecilia Richards] This paper presents experimental and numerical results of mixed electroosmotic and pressure driven flows in a trapezoidal shaped microchannel. A micro particle image velocimetry (μPIV) technique is utilized to acquire velocity profiles across the microchannel for pressure, electroosmotic and mixed electroosmotic-pressure driven flows. In mixed flow studies, both favorable and adverse pressure gradient cases are considered. Flow results obtained from theμPIV technique are compared with 3D numerical predictions, and an excellent agreement is obtained between them. In the numerical technique, the electric double layer is not resolved to avoid expensive computation, rather a slip velocity is assigned at the channel surface based on the electric field and electroosmotic mobility. This study shows that a trapezoidal microchannel provides a tapered-cosine velocity profile if there is any pressure gradient in the flow direction. This result is significantly different from that observed in rectangular microchannels. Our experimental results verify that velocity distribution in mixed flow can be decomposed into pressure and electroosmotic driven components. Springer-Verlag, 2006 Trapezoidal microchannel nationallicence Microfluidics nationallicence Electroosmotic flow nationallicence μPIV nationallicence Mobility nationallicence Horiuchi Keisuke Mechanical and Materials Engineering, Washington State University, 99164-2920, Pullman, WA, USA aut Dutta Prashanta Mechanical and Materials Engineering, Washington State University, 99164-2920, Pullman, WA, USA aut Richards Cecilia Mechanical and Materials Engineering, Washington State University, 99164-2920, Pullman, WA, USA aut Microfluidics and Nanofluidics Springer-Verlag 3/3(2007-06-01), 347-358 1613-4982 3:3<347 2007 3 10404 https://doi.org/10.1007/s10404-006-0129-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10404-006-0129-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Horiuchi Keisuke Mechanical and Materials Engineering, Washington State University, 99164-2920, Pullman, WA, USA aut NATIONALLICENCE 700 1- Dutta Prashanta Mechanical and Materials Engineering, Washington State University, 99164-2920, Pullman, WA, USA aut NATIONALLICENCE 700 1- Richards Cecilia Mechanical and Materials Engineering, Washington State University, 99164-2920, Pullman, WA, USA aut NATIONALLICENCE 773 0- Microfluidics and Nanofluidics Springer-Verlag 3/3(2007-06-01), 347-358 1613-4982 3:3<347 2007 3 10404 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer