A master thesis from Aalborg University
CFD analysis to determine the local Nusselt number over a heated micro wire in multicomponent flow
Author(s)
Term
4. term
Education
Publication year
2016
Submitted on
2016-05-30
Abstract
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.
Keywords
Documents
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