Dynamic flow characteristics in U-type anti-high overload microfluidic inertial switch

  • Teng ShenEmail author
  • Jiajie Li
  • Liu Huang
  • Jiaqing Chang
  • Jinlong Xie
Research Paper
Part of the following topical collections:
  1. 2018 International Conference of Microfluidics, Nanofluidics and Lab-on-a-Chip, Beijing, China


Under the action of unidirectional inertial force, the working liquid can bear high overload and not be dispersed in the U-type connected microchannel. This structure provides the possibility for designing anti-high overload microfluidic inertial switch. Based on the designed U-type microfluidic inertial switch, the dynamic flow process of liquid in U-type microchannel under inertial force was studied to predict and evaluate the characteristic of anti-overload. The unsteady Bernoulli flow model with the effect of viscosity local resistance was derived by utilizing the undetermined factor k. The VOF and CSD modules in CFD software were employed to analyze the transient flow process, and then the factor k was obtained by the simulation results. Centrifugal test platform was utilized to measure the variation of liquid surface movement displacement. The result shows that the modified dynamic flow model can reasonably describe the flow process of liquid surface, and the oscillations frequency and amplitude of the liquid surface increase with the increase of the inertial acceleration and the cross-sectional size of the microchannel. Moreover, even under the load of 3000 g, the liquid does not appear to be dispersed, which indicates that the U-type structure inertial switch has the characteristics of anti-high overload.


U-type microchannel Anti-high overload Dynamic flow Inertial switch 



The authors gratefully acknowledge the funding support from the special fund project of Guangzhou science and technology innovation development, and the Research Start-up Fund for Ph. D. Graduate students of Guangzhou University.


  1. Alam A, Afzal A, Kim KY (2014) Mixing performance of a planar micromixer with circular obstructions in a curved microchannel. Chem Eng Res Des 92(3):423–434CrossRefGoogle Scholar
  2. Chen JM, Huang PC, Lin MG (2008) Analysis and experiment of capillary valves for microfluidics on a rotating disk. Microfluid Nanofluidics 4(5):427–437CrossRefGoogle Scholar
  3. Chen W, Wang Y, Ding G et al (2014) Simulation, fabrication and characterization of an all-metal contact-enhanced triaxial inertial microswitch with low axial disturbance. Sens Actuators A Phys 220:194–203CrossRefGoogle Scholar
  4. Chu JC, Teng JT, Greif R (2010) Experimental and numerical study on the flow characteristics in curved rectangular microchannels. Appl Therm Eng 30(13):1558–1566CrossRefGoogle Scholar
  5. Chu JC, Teng JT, Xu T et al (2012) Characterization of frictional pressure drop of liquid flow through curved rectangular microchannels. Exp Therm Fluid Sci 38:171–183CrossRefGoogle Scholar
  6. Duryodhan VS, Singh SG, Agrawal A (2013) Liquid flow through a diverging microchannel. Microfluid Nanofluidics 14(1-2):53–67CrossRefGoogle Scholar
  7. Gao R, Cheng Z, Choo J (2016) Wash-free magnetic immunoassay of the PSA cancer marker using SERS and droplet microfluidics. Lab Chip 16(6):1022–1029CrossRefGoogle Scholar
  8. Gerson Y, Schreiber D, Grau H et al (2014) Meso scale MEMS inertial switch fabricated using an electroplated metal-on-insulator process. J Micromech Microeng 24(2):1–8CrossRefGoogle Scholar
  9. Hartnett JP, Kostic M (1989) Heat transfer to Newtonian and non-Newtonian fluids in rectangular ducts. Adv Heat Transf 19:247–356 (Elsevier) CrossRefGoogle Scholar
  10. Hrnjak P, Tu X (2007) Single phase pressure drop in microchannels. Int J Heat Fluid Flow 28(1):2–14CrossRefGoogle Scholar
  11. Huang YP et al (2013) Design and implementation of time-delay switch triggered by inertia load. In: 2013 IEEE 26th int. conf. micro electro mechanical systems (MEMS) (IEEE), pp 729–732Google Scholar
  12. Jia Y, Ren Y, Liu W et al (2016) Electrocoalescence of paired droplets encapsulated in double-emulsion drops. Lab Chip 16(22):4313–4318CrossRefGoogle Scholar
  13. Jia Y, Ren Y, Hou L et al (2017) Sequential coalescence enabled two-step microreactions in triple-core double-emulsion droplets triggered by an electric field. Small 13(46):1702188CrossRefGoogle Scholar
  14. Jia Y, Ren Y, Hou L et al (2018) Electrically controlled rapid release of actives encapsulated in double-emulsion droplets. Lab Chip 18(7):1121–1129CrossRefGoogle Scholar
  15. Kim DS, Kwon TH (2006a) Modeling, analysis and design of centrifugal force driven transient filling flow into rectangular microchannel. Microsyst Technol 12(9):822–838CrossRefGoogle Scholar
  16. Kim DS, Kwon TH (2006b) Modeling, analysis and design of centrifugal force-driven transient filling flow into a circular microchannel. Microfluid Nanofluidics 2(2):125–140CrossRefGoogle Scholar
  17. Kim J et al (2002) A micromechanical switch with electrostatically driven liquid-metal droplet. Sens Actuators A 97:672–679CrossRefGoogle Scholar
  18. Kim H, Jang YH, Kim YK et al (2014) MEMS acceleration switch with bi-directionally tunable threshold. Sens Actuators A Phys 208:120–129CrossRefGoogle Scholar
  19. Ko HS, Gau C (2009) Bonding of a complicated polymer microchannel system for study of pressurized liquid flow characteristics with the electric double effect. J Micromech Microeng 19(11):115024CrossRefGoogle Scholar
  20. Kuo JC et al (2013) A passive inertial switch using MWCNT- hydrogel composite with wireless interrogation capability. J Microelectromech Syst 22 646–654CrossRefGoogle Scholar
  21. Li J, Nie W, Liu G (2018) Microfluidic inertial switch based on J-shape communicating vessels. Microsyst Technol. CrossRefGoogle Scholar
  22. Lv J, Liu Y, Wei J et al (2016) Photocontrol of fluid slugs in liquid crystal polymer microactuators. Nature 537(7619):179CrossRefGoogle Scholar
  23. Maeda K, Onoe H, Takinoue M et al (2012) Controlled synthesis of 3D multi-compartmental particles with centrifuge-based microdroplet formation from a multi-barrelled capillary. Adv Mater 24(10):1340–1346CrossRefGoogle Scholar
  24. Matsunaga T, Esashi M (2002) Acceleration switch with extended holding time using squeeze film effect for side airbag systems. Sens Actuators A Phys 100(1):10–17CrossRefGoogle Scholar
  25. Mohammed HA, Gunnasegaran P, Shuaib NH (2011) Numerical simulation of heat transfer enhancement in wavy microchannel heat sink. Int Commun Heat Mass Transf 38(1):63–68CrossRefGoogle Scholar
  26. Park U, Yoo K, Kim J (2010) Development of a MEMS digital accelerometer (MDA) using a microscale liquid metal droplet in a microstructured photosensitive glass channel. Sens Actuators A 159:51–57CrossRefGoogle Scholar
  27. Sen P, Kim CJ (2009) A fast liquid–metal droplet microswitch using EWOD-driven contact-line sliding. J Microelectromech Syst 18:174–185CrossRefGoogle Scholar
  28. Shen T, Zhang D, Huang L et al (2016a) An automatic-recovery inertial switch based on a gallium–indium metal droplet. J Micromech Microeng 26(11):115016CrossRefGoogle Scholar
  29. Shen T, Huang L, Wang J (2016b) Analysis and experiment of transient filling flow into a rectangular microchannel on a rotating disk. Microfluid Nanofluidics 20(4):52CrossRefGoogle Scholar
  30. Yap YF, Tan SH, Nguyen NT et al (2009) Thermally mediated control of liquid microdroplets at a bifurcation. J Phys D Appl Phys 42(6):065503CrossRefGoogle Scholar
  31. Yoo K, Kim J (2009) A novel configurable MEMS inertial switch using microscale liquid-metal droplet. In: IEEE 22nd int. conf. on micro electro mechanical systems, 2009. MEMS 2009 (IEEE) pp 793–796Google Scholar
  32. Yoo K, Park U, Kim J (2011) Development and characterization of a novel configurable MEMS inertial switch using a microscale liquid-metal droplet in a microstructured channel. Sens Actuators A 166:234–240CrossRefGoogle Scholar
  33. Yoon DH, Ha JB, Bahk YK et al (2009) Size-selective separation of micro beads by utilizing secondary flow in a curved rectangular microchannel. Lab Chip 9(1):87–90CrossRefGoogle Scholar

Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.School of Mechanical and Electrical EngineeringGuangzhou UniversityGuangzhouChina
  2. 2.School of Mechanical and EngineeringNanjing University of Science and TechnologyNanjingChina

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