Approximate analysis of heat transfer in transpired boundary layers at limiting Prandtl numbers
Abstract
A simple procedure is developed for approximate calculations of wall heat-transfer rates in transpired boundary layers. Applications of this procedure are illustrated by various examples of incompressible, laminar flows in the limits of large and small Prandtl numbers. A distinguished limit of large Prandtl number and small mass-transfer rate is easily identified, and some limiting solutions are presented for the porous-plate configuration. Calculations for the cases with small Prandtl numbers explicitly demonstrate the usefulness of the method in studying transient heat-conduction problems. The remarkable combination of accuracy and simplicity represents the principal merit of the method.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- July 1974
- Bibcode:
- 1974STIN...7512255Z
- Keywords:
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- Heat Transfer;
- Laminar Boundary Layer;
- Prandtl Number;
- Incompressible Flow;
- Mass Transfer;
- Porosity;
- Surface Properties;
- Fluid Mechanics and Heat Transfer