Modeling and Analysis of a Microfluidic Capillary Valve, pages: 487-494



Here, a numerical model for analysis of a capillary valve for use in microfluidic devices was presented. Capillary valves are preferred especially in passive microfluidic systems, where the capillary forces dominate the liquid motion, to manipulate the flow. The capillary valve in this work, was formed by the sudden expansion of a rectangular microchannel to an opening, whose depth and width are larger than the height and the width of the channel respectively. Noting that there was no available analytical model to determine the pressure capacity of such valves, a numerical model based on energy minimization was utilized. Free software Surface Evolver was used to solve the model. Dependence of the pressure capacity on the contact angle of the working liquid on the channel material was investigated. It was found that the pressure capacity of the valves would be maximum if the contact angle on all surfaces is 90o. Accordingly, the valves could withstand approximately 2.5 kPa for 100 µm × 100 µm channels when the contact angle was 90o. The model was verified by comparing the results with those available in the literature.  

Anahtar Kelimeler

Microfluidic, Capillary Valve, Pressure Capacity, Contact Angle


Au A. K., Lai H., Utela B. R., and Folch A., “Microvalves and Micropumps for BioMEMS”, Micromachines, 2: 179–220, (2011).

Man P., Mastrangelo C., Burns M., and Burke D., “Microfabricated plastic capillary systems with photo-definable hydrophilic and hydrophobic regions”, International Conference on Solid-State Sensors Actuators and Microsystems, Sendai, Japan, 1-5, (1999).

Feng Y., Zhou Z., Ye X., and Xiong J., “Passive valves based on hydrophobic microfluidics”, Sensors and Actuators A: Physical, 108: 138–143, (2003).

Cho H., Kim H.-Y., Kang J. Y., and Kim T. S., “How the capillary burst microvalve works”, Journal of Colloid and Interface Science, 306: 379–385, (2007).

Chen J. M., Huang P.-C., and Lin M.-G., “Analysis and experiment of capillary valves for microfluidics on a rotating disk”, Microfluidics and Nanofluidics, 4: 427–437, (2007).

Leu T.-S. and Chang P.-Y., “Pressure barrier of capillary stop valves in micro sample separators”, Sensors and Actuators A: Physical, 115: 508–515, (2004).

Man P. P. F., Mastrangelo C. H., Burns M. A., and Burke D. T., “Microfabricated capillarity-driven stop valve and sample injector”, Annual International Workshop on Micro Electro Mechanical Systems, Heidelberg, Germany, 1–6, (1998).

Zimmermann M., Hunziker P., and Delamarche E., “Valves for autonomous capillary systems”, Microfluidics and Nanofluidics, 5: 395–402, (2008).

Yıldırım E., Trietsch S. J., Joore J., van den Berg A., Hankemeier T., and Vulto P., “Phaseguides as tunable passive microvalves for liquid routing in complex microfluidic networks”, Lab on a Chip, 14: 3334–3340, (2014).

Glière A. and Delattre C., “Modeling and fabrication of capillary stop valves for planar microfluidic systems”, Sensors and Actuators A: Physical, 130: 601–608, (2006).

Concus P. and Finn R., “On the behavior of a capillary surface in a wedge”, Proceedings of the National Academy of Sciences, 63: 292–299, (1969).

Vulto P., Podszun S., Meyer P., Hermann C., Manz A., and Urban G. A., “Phaseguides: a paradigm shift in microfluidic priming and emptying”, Lab on a Chip, 11: 1596–602, (2011).

Dong M. and Chatzis I., “The imbibition and flow of a wetting liquid along the corners of a square capillary tube”, Journal of Colloid and Interface Science, 172: 278–288, (1995).

Mittelmann H. and Zhu A., “Capillary surfaces with different contact angles in a corner”, Microgravity Science and Technology, 1: 22-27, 1996.

Brakke K. A., “The Surface Evolver”, Experimental Mathematics, 1: 141–165, (1992).

Lei K.F., “Materials and Fabrication Techniques for Nano- and Microfluidic Devices”, Microfluidics in Detection Science : Lab-on-a-chip Technologies, The Royal Society of Chemistry, Cambridge, UK, (2014).

Duffy D. C., McDonald J. C., Schueller O. J., and Whitesides G. M., “Rapid Prototyping of Microfluidic Systems in Poly(dimethylsiloxane)”, Analytical Chemistry, 70: 4974–4984, (1998).

Becker H., “Polymer microfluidic devices”, Talanta, 56: 267–287, (2002).

Myshkis A. D., Babskii V. G., Kopachevskii N. D., Slobozhanin L. A., and Tyuptsov A. D., “Low-Gravity Fluid Mechanics, Mathematical Theory of Capillary Phenomena”, Springer-Verlag, 1, Berlin, (1987).

Kasap E. N., Çoğun F., Yıldırım E., Boyacı İ. H., Çetin D., Suludere Z., Tamer U., and Ertaş N., “Microchip Based Determination of Bacteria by In-chip Sandwich Immunoassay”, International Multidisciplinary Symposium on Drug Research and Development, Eskişehir, Turkey, 89, (2015).

Doğan Ü., Kasap E., Çoğun F., Yıldırım E., Çetin D., Suludere Z., Boyacı İ. H., Ertaş N., and Tamer U., “Simultaneous Detection of Two Different Bacteria Using QDs and MNPs”, International Conference: 10th Aegean Analytical Chemistry Days, Çanakkale, Turkey, 365, (2016).

Ahi E. E., Gümüştaş A., Çiftçi H., Çağlayan M. G., Selbes Y. S., Çoğun F., Yıldırım E., and Tamer U., “Chip-Based Immunomagnetic Separation of Human Chorionic Gonadotropin”, International Conference: 10th Aegean Analytical Chemistry Days, Çanakkale, Turkey, 361, 2016.

Tam Metin: PDF (English)


  • Şu halde refbacks yoktur.

Politeknik Dergisi © 2014

P-ISSN 1302-0900    E-ISSN 2147-9429