Accession Number:

AD0785239

Title:

Approximate Analysis of Heat Transfer in Transpired Boundary Layers at Limiting Prandtl Numbers

Descriptive Note:

Corporate Author:

NAVAL ORDNANCE LAB WHITE OAK MD

Personal Author(s):

• Zien, Tse-Fou

Report Date:

1974-07-01

Pagination or Media Count:

34.0

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.

Descriptors:

• *HEAT TRANSFER
• *LAMINAR BOUNDARY LAYER
• APPROXIMATION(MATHEMATICS)
• INCOMPRESSIBLE FLOW
• MATHEMATICAL MODELS
• POROSITY
• PRANDTL NUMBER
• SURFACE PROPERTIES
• WALLS

Subject Categories:

• Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE