This masters thesis investigates the phenomena
related to microchannels and discuses how these
can be used with Thermo Electric Generators.
State of the art of the system level TEG is dis-
cussed and a number of methods for choosing the
optimal heat sink design is discussed. An experi-
ment is performed on a mini channel to investigate
the ow phenomena's related to the small dimen-
sions. This is done in two ways, rst an integral
approach where UA values are determined and ex-
isting correlations compared to the measured av-
erage Nusselt number. And again with a novel
experimental design involving Particle Image Ve-
locimitry and Planar Laser Induced Fluorescence.
This way it is tried to determine the local Nus-
selt values with direct and non-intrusive measur-
ing methods. It is concluded that it is possible
to resolve both the thermal and hydrodynamical
boundary layers but not to a degree of precision
that allows determination of the Nusselt number.
A number of suggestions are made for further im-
provements.