An improved numerical study of the wall effect on hot-wire measurements
Publication date
2003-08
Document type
Research article
Author
Organisational unit
Universität Erlangen-Nürnberg
Scopus ID
ISSN
Series or journal
Journal of Heat Transfer
Periodical volume
125
Periodical issue
4
First page
595
Last page
603
Part of the university bibliography
Nein
Abstract
Numerical investigations of the heat transfer from hot wires in near-wall measurements were carried out. Special attention was paid to the effect of the wall thickness, the flow conditions below the wall and the shear velocity connected to different wall materials. Compared with previous studies, an improved physical model taking into account the flow region below the wall in the computational domain was applied. The results obtained agree well with experimental data in the literature for walls consisting of both highly and poorly conducting materials. The investigation showed that the shear velocity U τ has a significant influence on hot-wire measurements in the vicinity of a wall. Nevertheless, discernible effects of the wall thickness and the flow condition below the wall were found only in the case of a poorly conducting wall. In addition, the results also suggest a weak effect of the overheat ratio for a wire with an infinitely large aspect ratio.
Version
Not applicable (or unknown)
Access right on openHSU
Metadata only access