In order to gain knowledge about the influence of
a hot wire anemometer to its surrounding and to
validate experimental results from a laboratory, a
CFD model is developed which contains a pipe and
the wire. The wire is placed in the center of the pipe.
This model is capable of running with different gas
compositions and humidifications, only dependent
on temperature. To achieve a fast meshing and
simulating process, the model is two dimensional.
This model showed that at low velocities heat
diffuses upstream and that the outlet temperature
is dependent on the flow velocity. A higher velocity
results in a lower temperature. Furthermore natural
convection can be neglected in the presented cases.
The coefficients for the Nusselt number correlation
were found similar to the coefficients from the
laboratory, but containing some deviations that
might be caused by the way of evaluating.
Furthermore a three dimensional model is build to
estimate the deviation between the two dimensional
and three dimensional model. It was found that in
the two dimensional model more heat per wire length
is transferred to the fluid.