Turbulent flow and heat transfer in bends of circular cross section. I - Heat transfer experiments
Abstract
Local heat transfer characteristics are experimentally determined for circular cross section bends to which fluid is delivered via either a sharp edged inlet or a hydrodynamic development tube, where the angles subtended by the bends were 30, 60, and 90 deg and Reynolds numbers were in the 5000-100,000 range. While the coefficients obtained at the outside of the bend were mostly larger than at the inside, deviations decreased with increasing Reynolds number. The streamwise distributions of the local transfer coefficient were markedly affected by the inlet condition; while those for the sharp edged inlet exhibited a universal shape, those for the tube-fed inlet depended both on Reynolds number and on whether the distribution corresponded to the inside or outside of the bend. These heat transfer results have been supplemented by flow visualization.
- Publication:
-
ASME Journal of Heat Transfer
- Pub Date:
- February 1986
- Bibcode:
- 1986ATJHT.108...40S
- Keywords:
-
- Circular Tubes;
- Ducted Flow;
- Flow Geometry;
- Heat Transfer Coefficients;
- Turbulent Heat Transfer;
- Bending;
- Duct Geometry;
- Flow Visualization;
- Mass Transfer;
- Nusselt Number;
- Fluid Mechanics and Heat Transfer