Laminar flow and conjugate heat transfer augmentation in tubes roughened with a circumferential rib
Abstract
A numerical study was conducted to examine fluid flow and heat transfer in circular tubes roughened with an internal circumferential rib. The flow considered is laminar and the outer wall of the tube is at constant temperature. The influence of heat conduction in the tube wall on the forced convection was also incorporated in the analysis. It was found that the heat transfer is affected markedly by the ratio of thermal conductivity of the wall to that of the fluid. For a ribbed tube, significant increase in heat transfer is achieved only for high Prandtl number fluids. The quantitative data of the size of the recirculation zones are presented and show good agreement with previous work. The associated pressure drop in a ribbed tube should also be considered as a determinating factor for an optimum design.
- Publication:
-
American Society of Mechanical Engineers
- Pub Date:
- December 1984
- Bibcode:
- 1984asme.meetS....N
- Keywords:
-
- Computational Fluid Dynamics;
- Heat Transfer Coefficients;
- Laminar Flow;
- Pipe Flow;
- Ribs (Supports);
- Surface Roughness Effects;
- Circumferences;
- Conductive Heat Transfer;
- Conjugates;
- Convective Heat Transfer;
- Optimization;
- Prandtl Number;
- Pressure Reduction;
- Systems Engineering;
- Fluid Mechanics and Heat Transfer