AN EXPERIMENTAL STUDY OF THE EFFECTS OF NONUNIFORM WALL TEMPERATURE ON HEAT TRANSFER IN LAMINAR AND TURBULENT AXISYMMETRIC FLOW ALONG A CYLINDER

Journal Article · Tue Nov 01 04:00:00 EST 1960 · Journal of Heat Transfer (U.S.)

DOI:https://doi.org/10.1115/1.3679952· OSTI ID:4116447

Eichhorn, R; Eckert, E R.G.; Anderson, A D

Measurements of both the hydrodynamic and thermal characteristics of flow over an axial cylinder at subsonic speeds are reported. It was found that the boundary layer along an axial cylinder tends to become asymmetrical as it approaches the transition point. This asymmetry vanishes again in turbulent flow. For both laminar and turbulent flow, the average boundary-layer growth could be predicted by the standand flat-plate relationships, and simple methods were deduced for determining the effective hydrodynamic length of the boundary layers. Local and total heattransfer measurements were made with both laminar and turbulent flow for various unheated starting lengths followed by linearly increasing wall temperatures. For laminar flow, agreement with theory was obtained, this agreement being improved by the Seban and Bond cylindrical curvature correction. The turbulent-flow results indicated preference for the theory of Seban. Isothermal equations represent turbulent heat transfer within approximately 20% when the wall-temperature variations are not too abrupt. (auth)

• Research Organization: Princeton Univ., N.J.
• Sponsoring Organization: USDOE
• NSA Number: NSA-15-002748
• OSTI ID: 4116447
• Journal Information: Journal of Heat Transfer (U.S.), Journal Name: Journal of Heat Transfer (U.S.) Vol. Vol: 82; ISSN JHTRA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BOUNDARY LAYERS
CYLINDERS
ENGINEERING AND EQUIPMENT
FLUID FLOW
HEAT TRANSFER
HYDRAULICS
LAMINAR FLOW
MEASURED VALUES
TEMPERATURE
TURBULENCE