Thermal Wave in Thermal Properties Measurements and Flow Diagnostics

The thermal wave technique has been explored for the
use of liquid thermal conductivity measurement and
flow property diagnostics in this dissertation. For
liquid thermal conductivity measurements, an
experimental technique based on the thermal wave
approach is developed. An aqueous fluid consisting of
gold nanoparticles was tested and anomalous thermal
conductivity enhancement was observed. Ourmeasurement results also showed a divergence of
thermal transport behavior between nanofluids and
pure liquids.
For the study of flow property diagnostics, a heat
transfer system with a periodic boundary condition in
a steady flow field is examined. Due to linearity and
homogeneity of the heat transfer system under certain
conditions, a thermal wave field generated by a
periodic heating flux at the boundary of the flow
field may be used to detect important flow field
parameters, such as the velocity gradient at the
wall, and therefore, the wall shear stress.

Autorentext

I held a Bachelor of Energy Engineering from ZhejiangUniversity,China. My master degree was from Rose-Hulman Instituteof Technology, IN and I completed my doctoral study in OregonState University, OR. My research area is thermal science/fluidmechanics in energy, semiconductor processing, and biomedicalapplications.

Klappentext

The thermal wave technique has been explored for theuse of liquid thermal conductivity measurement andflow property diagnostics in this dissertation. Forliquid thermal conductivity measurements, anexperimental technique based on the thermal waveapproach is developed. An aqueous fluid consisting ofgold nanoparticles was tested and anomalous thermalconductivity enhancement was observed. Ourmeasurement results also showed a divergence ofthermal transport behavior between nanofluids andpure liquids. For the study of flow property diagnostics, a heattransfer system with a periodic boundary condition ina steady flow field is examined. Due to linearity andhomogeneity of the heat transfer system under certainconditions, a thermal wave field generated by aperiodic heating flux at the boundary of the flowfield may be used to detect important flow fieldparameters, such as the velocity gradient at thewall, and therefore, the wall shear stress.