INCOMPRESSIBLE FRICTION FACTOR, TRANSITION AND HYDRODYNAMIC ENTRANCE LENGTH STUDIES OF DUCTS WITH TRIANGULAR AND RECTANGULAR CROSS-SECTIONS
Technical Report
·
OSTI ID:4309205
Measurements are presented on friction factors, critical Reynolds numbers, and hydrodynamic entrance lengths of air flowing with subsonic velocities through non-circular ducts. The data were obtained for two ducts: one having the shape of an isosceles triangle with a 23 degree apex angle, and the other a rectangular duct with a width to breadth ratio of 3. The results of these measurements clarify discrepancies which existed in the literature on friction factors for developed laminar flow. They give new information on hydrodynamic entrance lengths and on critical Reynolds numbers for transition to turbulence. (auth)
- Research Organization:
- Minnesota. Univ., Minneapolis. Heat Transfer Lab.
- NSA Number:
- NSA-12-009788
- OSTI ID:
- 4309205
- Report Number(s):
- WADC-TR-58-85; AD-151027
- Country of Publication:
- United States
- Language:
- English
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