Abstract
We newly developed a measurement technique for a liquid film flow via a single-tip optical fiber probe (S-TOP). The measurement method for the liquid-film thickness is as follows; the S-TOP with a tapered tip was installed parallel to the main stream, and detected a wavy surface; the liquid phase fractions were calculated in every installed position of the S-TOP. Through a computational method of the S-TOP, we obtained the relationship among the liquid phase fractions, the installed positions and the wave heights. Moreover, the wave velocities were accurately measured with our original micro-fabricated S-TOP that has two sensors. The experimental and numerical analyses were executed in order to understand the complex signals of the S-TOP. Finally, the simultaneous measurement technique of the thickness and wave velocity was obviously demonstrated. When the liquid phase fraction was 0.52, the installed-position equals the average film thickness. A difference in the results of the wave velocity between the S-TOP and the visualization was -10.3 %.
