LIF-Based Temperature Sensitive Particles for Three-Dimensional Measurement of Velocity and Temperature

Abstract

Temperature sensitive particles have been developed which enable the three-dimensional simultaneous measurement of velocity and temperature in a fluid flow. Even with the recent advances in experimental techniques, the three-dimensional simultaneous measurement of all the three components of velocity and the temperature could not be performed. As for the velocities, one can utilize the three-dimensional particle tracking velocimetry (3-D PTV). But, as for the temperature, even with the laser-induced fluorescence technique (LIF), one can obtain a dense distribution of two-dimensional temperature. Presently, the authors have developed two types of temperature sensitive particles that contain the fluorescence material inside. Using these particles, the simultaneous temperature measurement can be carried out within the framework of the 3-D PTV. In this study, the preparation procedures of these particles have been demonstrated. The calibrations have proved the applicability of the present particles to the temperature measurement and the uncertainties at 20:1 odds are found to be 1.18 degree and 0.78 degree respectively.