Local mass transfer in corrugated-walled ducts and heat exchanger configurations
Abstract
Local and average air-side transfer coefficients were measured for a one-row corrugated fin and tube heat exchanger configuration. The onset and character of secondary flow longitudinal vortices, and the local and average transfer characteristics for flow in a corrugated wall channel were also experimentally investigated. The measurements were accomplished via the naphthalene sublimation technique. Local transfer coefficients for the heat exchanger configuration revealed a set of complex flow phenomena. In common with the plane fin case, the initial portion of the exchanger lies within the regime of developing boundary layer, and a strong vortex system is found adjacent to the front of the tubes. In addition, the concave streamline curvature in the flow direction is responsible for secondary flow longitudinal vortices, whose action becomes visible mostly on the lower surface. In the wake of the tube there is another vortex system. The corrugated nature of the surfaces accounts for the manner in which these vortices impact on the walls.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- December 1975
- Bibcode:
- 1975PhDT........39G
- Keywords:
-
- Corrugating;
- Ducts;
- Heat Exchangers;
- Mass Transfer;
- Wall Flow;
- Boundary Layers;
- Sublimation;
- Vortices;
- Fluid Mechanics and Heat Transfer