EXPERIMENTAL INVESTIGATION ON INFLUENCE FACTORS OF NANOFLUIDS ON SATURATED POOL BOILING CHF FOR DOWNWARD FACING SURFACE

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After the severe accident inside a nuclear reactor, the IVR (In-vessel retention) management strategy is an effective way to keep the integrity of pressure vessel and reduce risk of radioactive leakage by holding the damaged core materials through External Reactor Vessel Cooling (ERVC). One of the most important topics is the characteristics of the CHF (Critical Heat Flux) on the outside wall of RPV lower head. In this work, several influence factors on saturated pool boiling CHF for downward facing heating surface were studied, including the type and concentration of working fluid, orientation angle. Experimental results indicated that CHF increases with increase of orientation angle of heating surface. It also indicated that both Al2O3/H2O and SiO2/H2O nanofluids could improve CHF dramatically compared to deionized water, but the CHF value of two types of nanofluids is similar to each other, which means type of nanoparticles has just little influence on CHF.

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