Abstract：

Experimentally investigates the dragreducing and heat transfer performances of cetyltrimethyl ammonium chloride (CTAC) surfactant solution with different concentrations and mixture ratios under different conditions in a twodimensional channel. The results indicate that the heat transfer reduction rate of the CTAC dragreducing fluid increases with Reynolds number when Reynolds number is below the critical value and decreases rapidly when Reynolds number exceeds the critical value, the trends of heat transfer reduction rate and drag reduction rate are similar, and the temperature gradient of the CTAC dragreducing fluid is larger than that of water in buffer layer and smaller than that of water in turbulent core area. 

Keywords:dragreducing fluid, heat transfer performance, surfactant, heat transfer reduction rate, drag reduction rate