Fig. 1. Mechanism of electric conductance method
Fig. 2. Photograph of liquid film thickness measurement device
Fig. 3. Mechanism of electric conductance method
Fig. 4. Specification of the measurement sensor
Fig. 5. Basic calibration with changing resistor
Fig. 6. Schematics of plate calibration method
Fig. 7. Calibration device and the measurement sensor
Fig. 8. Standard cell and taping calibration method
Fig. 9. Calibration error between standard cell and neighbor cell
Fig. 10. Average calibration curve with errors
Fig. 11. Arrangement of the measurement sensor
Fig. 12. Improvement on the sensor spatial resolution
Table 1. Kinds of fixed resistors
References
- R. Arnold, D. I. Suslov, and O. J. Haidn, "Experimental investigation of film cooling with tangential slot injection in a LOX/CH4 subscale rocket combustion chamber" Trans. JSASS Space Tech. Jpn., Vol. 7, No. 26, pp.81-86, 2009.
- M. Damsohn and H. -M. Prasser, "High-speed liquid film sensor for two-phase flows with high spatial resolution based on electrical conductance", Flow Meas. Instrum., Vol. 20, No. xx, pp. 1-14, 2009. https://doi.org/10.1016/j.flowmeasinst.2008.06.006
- T. Kamei and A. Serizawa, "Measurement of 2-dimensional local instantaneous liquid film thickness around simulated nuclear fuel rod by ultrasonic transmission technique", Nucl. Eng. Des., Vol. 184, No. xx, pp. 349-362, 1998. https://doi.org/10.1016/S0029-5493(98)00208-8
- M. Alonso, P. J. Kay, P. J. Bowen, R. Gilchrist, and S. Sapsford, "A laser induced Fluorescence technique for quantifying transient liquid fuel films utilizing total internal reflection", Exp. Fluids, Vol. 48, No. xx, pp. 133-142, 2010. https://doi.org/10.1007/s00348-009-0720-8
- T. Inamura, H. Yanaoka, and T. Tomoda, "Prediction of mean droplet size of sprays issued from wall impingement injector", AIAA J., Vol. 42, No. 3, pp. 614-621, 2004. https://doi.org/10.2514/1.9112
- K. B. Lee, J. R. Kim, G. C. Park, and H. K. Cho, "Feasibility test of a liquid film thickness sensor on a flexible printed circuit board using a three-electrode conductance method", Sensors, Vol. 17, No. 1, pp. 42, 2017. https://doi.org/10.3390/s17010042
- K. B. Lee, J. R. Kim, D. J. Euh, G. C. Park, and H. K. Cho, "Development of Three-ring Conductance Sensor based on Flexible Printed Circuit Board for Measuring Liquid Film thickness in Two-phase Flow with High Resolution", J. Sens. Sci. Technol., Vol. 25, No. 1, pp. 57-64, 2016. https://doi.org/10.5369/JSST.2016.25.1.57