Combining the Capacitively Coupled Contactless Conductivity Detection (C 4D) technique and the principle of cross correlation flow measurement, a new method for flow rate measurement in millimeter-scale pipes was proposed. The research work included two parts. First, a new five-electrode C 4D sensor was developed. Second, with two conductivity signals obtained by the developed sensor, the flow rate measurement was implemented by using the principle of cross correlation flow measurement. The experimental results showed that the proposed flow rate measurement method was effective, the developed five-electrode C 4D sensor was successful, and the measurement accuracy was satisfactory. In five millimeter-scale pipes with different inner diameters of 0.5, 0.8, 1.8, 3.0 and 3.9 mm respectively, the maximum relative difference of the flow rate measurement between the reference flow rate and the measured flow rate was less than 5%.
References
[1]
Goldstein, R.J. Fluid Mechanics Measurements, 2nd ed. ed.; Taylor & Francis: Philadelphia, PA, USA, 1996.
[2]
Nakra, B.C.; Chaudhry, K.K. Instrumentation, Measurement and Analysis, 2nd ed. ed.; Tata McGraw-Hill Education: New Delhi, India, 2004; p. 289.
[3]
Pereira, M. Flow meters: Part 1. IEEE Instru. Meas. Mag. 2009, 12, 18–26.
[4]
Baker, R.C. Flow Measurement Handbook; Cambridge University Press: New York, NY, USA, 2000.
[5]
Spitzer, D.W. Industrial Flow Measurement, 3rd ed. ed.; The Instrumentation, Systems, and Automation Society (ISA): New York, NY, USA, 2005.
[6]
Kandlikar, S.G. Fundamental issues related to flow boiling in minichannels and microchannels. Exp. Therm. Fluid Sci. 2002, 26, 389–407.
[7]
Bergles, E. Boiling and evaporation in small diameter channels. Heat Transf. Eng. 2003, 24, 18–40.
[8]
Kandlikar, S.G. Heat Transfer and Fluid Flow in Minichannels and Microchannels; Elsevier: Oxford, UK, 2006; pp. 1–136.
da Silva, J.A.F.; do Lago, C.L. An oscillometric detector for capillary electrophoresis. Anal. Chem. 1998, 70, 4339–4343.
[16]
Gas, B.; Demjanenko, M.; Vacik, J. High-frequency contactless conductivity detection in isotachophoresis. J. Chromatogr. A 1980, 192, 253–257.
[17]
Kuban, P.; Hauser, P.C. A review of the recent achievements in capacitively coupled contactless conductivity detection. Anal. Chim. Acta 2008, 607, 15–29.
[18]
Huang, Z.Y.; Jiang, W.W.; Zhou, X.M.; Wang, B.L.; Ji, H.F.; Li, H.Q. A new method of capacitively coupled contactless conductivity detection based on series resonance. Sens. Actuators B 2009, 143, 239–245.
Shih, C.-Y.; Li, W.; Zheng, S.Y.; Tai, Y.-C. A resonance-induced sensitivity enhancement method for conductivity sensors. Proceedings of 5th IEEE Conference on Sensors, Daegu, Korea, 22–25 October 2006; pp. 271–274.
Coltro, W.K.T.; Lima, R.S.; Segato, T.P.; Carrilho, E. Capacitively coupled contactless conductivity detection on microfluidic systems—Ten years of development. Anal. Methods 2012, 4, 25–33.
[23]
Brito-Neto, J.; Fracassi da Silva, J.; Blanes, L.; do Lago, C. Understanding capacitively coupled contactless conductivity detection in capillary and microchip electrophoresis. Part I. Fundamentals. Electroanalysis 2005, 17, 1198–1206.
[24]
Pumera, M. Contactless conductivity detection for microfluidics: Designs and applications. Talanta 2007, 74, 358–364.
[25]
Laugere, F.; Lubking, G.W.; Bastemeijer, J.; Vellekoop, M.J. Design of an electronic interface for capacitively coupled four-electrode conductivity detection in capillary electrophoresis microchip. Sens. Actuators B 2002, 83, 104–108.
[26]
Laugere, F.; Lubking, G.W.; Berthold, A.; Bastemeijer, J.; Vellekoop, M.J. Downscaling aspects of a conductivity detector for application in on-chip capillary electrophoresis. Sens. Actuators A 2001, 92, 109–114.
[27]
Laugere, F.; Guijt, R.M.; Bastemeijer, J.; Steen, G.V.D.; Berthold, A; Baltussen, E.; Sarro, P.; van Dedem, G.W.; Vellekoop, M.; Bosschet, A. On-chip contactless four-electrode conductivity detection for capillary electrophoresis devices. Anal. Chem. 2003, 75, 306–312.
[28]
Bastemeijer, J.; Lubking, W.; Laugere, F.; Vellekoop, M. Electronic protection methods for conductivity detectors in micro capillary electrophoresis devices. Sens. Actuators B 2002, 83, 98–103.
