ESDU 77031
Heat transfer by free convection and radiation - simply shaped bodies in air and other fluids.
Abstract:
ESDU 77031 gives equations for the free convective steady-state heat transfer coefficient for an internally heated or cooled (provided there is no condensation) vertical, inclined or horizontal flat plate, a vertical or horizontal cylinder, and a sphere. The equations are given for any fluid with a Prandtl number exceeding 0.7 and simplified equations are also given for the special case where the fluid is ambient air. In addition the radiative heat transfer from (or to) a body in an enclosure or close to a surface is considered, and view factor information is provided graphically for the body shapes considered. Also given is a table of emissivities of common surfaces. Practical worked examples illustrate the application of the data which is assisted by a guidance flowchart.Indexed under:
- Air
- Free Convection Heat Transfer
- Radiation Heat Transfer
- Stefan-Boltzmann Radiation Constant
- Thermal Emissivity
Details:
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This Data Item contains 10 interactive graph(s) as listed below.
| Graph | Title |
|---|---|
| Figure 1 | Thermal conductivity of air at atmospheric pressure |
| Figure 2 | Flow regimes for inclined rectangular plates in ambient air |
| Figure 3 | View factor for parallel rectangular plates |
| Figure 4a | View factor for rectangular plates joined along one edge. Φ = 30 degrees |
| Figure 4b | View factor for rectangular plates joined along one edge. Φ = 60 degrees |
| Figure 4c | View factor for rectangular plates joined along one edge. Φ = 90 degrees |
| Figure 4d | View factor for rectangular plates joined along one edge. Φ = 120 degrees |
| Figure 4e | View factor for rectangular plates joined along one edge. Φ = 150 degrees |
| Figure 5 | View factor for long cylinder parallel to long plate |
| Figure 6 | View factor for sphere and plate |