Affiliations: Visualization Research Center, Niigata University,
8050 Ikarashi-2, Niigata, 950-2181, Japan. E-mail:
fujisawa@eng.niigata-u.ac.jp
Abstract: In this paper, non-intrusive imaging techniques for simultaneously
measuring temperature and velocity fields of thermal liquid flows are
described. The experimental methods for temperature imaging considered here are
the thermo-sensitive liquid crystal tracers and the laser-induced fluorescence,
which are combined with particle image velocimetry (PIV) to measure
simultaneously the corresponding 2D and 3D velocity fields. The features of
these experimental methods and characteristics are examined, covering the
measurable temperature range, uncertainty of measurement, time response and so
on. The successful examples of simultaneous measurement of temperature and
velocity fields are described for turbulent Rayleigh-Bérnard
convection of a horizontal fluid layer and turbulent buoyant plume issuing from
a circular nozzle, and their physical mechanisms of transport phenomena are
explained.