Simultaneous imaging of temperature field and flow field around a micro-heating sphere by applying the near infrared temperature imaging method

Abstract

Prediction and measurement of temperature fields formed by a small heat source inside liquid are important for various thermal applications such as inductive heating of magnetic particles, crystal growth, and laser heating. However, as local temperature differences cause natural convection in many cases, the temperature field becomes complicated, which makes the prediction and measurement more difficult. We thus used the temperature imaging method based on the temperature dependence of the absorption band of water in the near-infrared region to investigate the temperature field around a 1-mm-diameter magnetic sphere under induction heating. In this study, to construct the flow field simultaneously with the temperature field, particle tracking velocimetry with Kalman filter is applied to the absorbance images used for the temperature measurement.