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.
- Free Convection Heat Transfer
- Radiation Heat Transfer
- Stefan-Boltzmann Radiation Constant
- Thermal Emissivity
|Data Item ESDU 77031|
The graphs listed below are available only to subscribers.
|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|