Abstract:

Heat transfer characteristics and enhanced heat transfer methods were summarized. Mechanism of enhancing heat transfer was analyzed. The most effective results, influence factors, and merits and drawbacks of each method were compared. The results showed that the mean temperature distribution of surfactant solution was completely different from that of water. In the surfactant solution there were two thermal boundary layers. The largest heat resistance was not in the near wall region but in the buffer layer region where y⁺ ranged from 10 to 100. The method of enhancing heat transfer ability of the drag reducing surfactant solution was summarized as a general process, in which the microstructure of the surfactant solution was broken to yield turbulent flow, and thus enhancing heat transfer. Some views and suggestions on enhancing heat transfer ability of drag-reducing flow were presented.