Experimental study of the improvement of heat transfer coefficients using turbulence promoters
Abstract
The purpose of this paper is to study experimentally the improvement of heat transfer coefficients between fluid and wall surfaces by the use of turbulence promoters in the channel. Glass rods of 3 mm, 5 mm, and 7 mm diameter were used as turbulence promoters, to cause an increase of turbulence in the bulk flow and the boundary layer. An alkaline solution was used as fluid. Mass transfer coefficients were obtained by the use of an electrochemical reaction of the redox system, and heat transfer coefficients were obtained by means of the analogy between heat and mass transfer phenomena. The results with turbulence promoters were compared with those without them. The increasing ratio of average and local transfer coefficients was correlated with the diameter and pitch of the promoter, Reynolds number and distance downstream from the promoter.
- Publication:
-
Heat Transfer Japanese Research
- Pub Date:
- March 1977
- Bibcode:
- 1977HTJR....6...90M
- Keywords:
-
- Heat Transfer Coefficients;
- Liquid-Solid Interfaces;
- Mass Transfer;
- Surface Reactions;
- Turbulent Boundary Layer;
- Correlation;
- Electrochemistry;
- Friction Factor;
- Glass;
- Reynolds Number;
- Fluid Mechanics and Heat Transfer