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Influence of thermal boundary conditions on heat transfer from a cylinder in cross flow
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Papell, S. S. |
| Copyright Year | 1981 |
| Description | Local heat transfer data over the leading surface of a cylinder in crossflow were obtained for a Reynolds number range of 50,000. The cylinder was operated at both uniform-wall-temperature and uniform-heat-flux thermal ance of 80 deg from the front stagnation point, the uniform-wall-temperature heat transfer coefficients were as much as 66 percent lower than the uniform-heat-flux data. Between the stagnation point and 60 deg around the cylinder, there were no significant differences in the data. This region of the cylinder is within the cylindrical curvature region of the front end of a real turbine so it was concluded that either thermal boundary condition could be used to model turbine flow over that region of the blade. Results of evaluating the exponent x in the fundamental relationship Nu=f(Re) sup x, which is used in data correlation show the exponent varies as a function of local position on the cylinder even in the laminar flow region. The value of x increases linearly from 0.50 at the stagnation point to 0.59 at 60 deg around the cylinder. This linear trend continued into the separation region at 80 deg for the uniform-wall-temperature data, but x increased markedly in the separation region for the uniform-heat-flux data. |
| File Size | 465498 |
| Page Count | 10 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19810020846 |
| Archival Resource Key | ark:/13960/t9867bb9f |
| Language | English |
| Publisher Date | 1981-08-01 |
| Access Restriction | Open |
| Subject Keyword | Fluid Mechanics And Heat Transfer Wall Temperature Test Facilities Nusselt Number Turbine Blades Cylindrical Bodies Stagnation Point Thermal Boundary Layer Boundary Conditions Heat Transfer Coefficients Data Correlation Graphs Charts Cross Flow Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
