Experimental study on subcooled pool boiling heat transfer of sodium dodecyl sulfate surfactant solution

The pool boiling heat transfer coefficient (HTC) and critical heat flux (CHF) of sodium dodecyl sulfate (SDS) surfactant solution under different concentrations and subcooling conditions were experimentally studied. The concentration of SDS was in the range of 0 to 3000 ppm, and the subcooling degree was in the range of 2 to 10 C. The heat transfer coefficient under different subcooling conditions was theoretically analyzed, and the real-time fluctuation of the wall temperature is discussed in detail. It is found that the subcooling has little effect on the natural convection of pool boiling but significantly impacts the nucleate boiling and that the phenomenon of temperature overshoot (TOS) is stronger in the SDS solution than that in de-ionized water. Furthermore, the origin and development process of TOS were deeply analyzed by showing the development process diagram. Meanwhile, the CHF phenomena were visualized and traced experimentally. The influence of different subcooling degrees and SDS concentrations on the CHF was deeply explored, and the development process diagram of the vapor film under CHF conditions was plotted. The results provide detailed theoretical support for the HTC and CHF of SDS solution under subcooling conditions.