Heat transfer characteristics of turbulent flow in a square channel with angled discrete ribs
Abstract
Experiments have been conducted to study the turbulent heat transfer and friction for fully developed flow of air in a square channel in which two opposite walls are roughened with 90-deg full ribs, parallel and crossed full ribs with angles-of-attack (alpha) of 60 deg and 45 deg, 90-deg discrete ribs, and parallel and crossed discrete ribs with = 60, 45, and 30 deg. Results are obtained for a rib height-to-channel hydraulic diameter ratio of 0.0625, a rib pitch-to-height ratio of 10, and Reynolds numbers between 10,000 and 80,000. Parallel angled discrete ribs are superior to 90 deg discrete ribs and parallel angled full ribs. For alpha = 60 deg and 45 deg, parallel discrete ribs have higher ribbed wall heat transfer, lower smooth wall heat transfer, and lower channel pressure drop than parallel full ribs.
- Publication:
-
ASME, 35th International Gas Turbine and Aeroengine Congress and Exposition
- Pub Date:
- June 1990
- Bibcode:
- 1990gatu.confU....L
- Keywords:
-
- Air Flow;
- Angle Of Attack;
- Friction Factor;
- Ribs (Supports);
- Turbulent Heat Transfer;
- Airfoils;
- Data Reduction;
- Gas Turbines;
- Pressure Drop;
- Reynolds Number;
- Wall Temperature;
- Fluid Mechanics and Heat Transfer