External Natural Convection

  • Donald A. Nield
  • Adrian Bejan


Numerical calculation from the full differential equations for convection in an unbounded region is expensive, and hence approximate solutions are important. For small values of the Rayleigh number Ra, perturbation methods are appropriate. At large values of Ra thermal boundary layers are formed, and boundary layer theory is the obvious method of investigation. This approach forms the subject of much of this chapter. We follow to a large extent the discussion by Cheng (1985a).


Porous Medium Nusselt Number Natural Convection Rayleigh Number Surface Heat Flux 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Springer Science+Business Media New York 1992

Authors and Affiliations

  • Donald A. Nield
    • 1
  • Adrian Bejan
    • 2
  1. 1.Engineering SciencesUniversity of AucklandAucklandNew Zealand
  2. 2.Mechanical EngineeringDuke UniversityDurhamUSA

Personalised recommendations