Experiment and predicted model study of resuspended nanofluid pool boiling heat transfer under electric field

Abstract

In the pool boiling, the deposition of nanoparticles leads to the instability of boiling heat transfer of nanofluids. While, electric field can actively control the movement of nanoparticles. Therefore, the nanoparticle resuspension behavior, boiling heat transfer of resuspended nanofluid and prediction models for boiling heat transfer of resuspended nanofluid under the electric field were studied in the present study. Concretely, the heat transfer performance under the coupling effect between electric field and resuspended nanofluid was discussed. Besides, pool boiling and critical heat flux (CHF) prediction model were proposed to research the heat transfer variation caused by the movement of nanoparticles under electric field. It is found that the nanoparticles can be resuspended by electric field, and the boiling heat transfer of resuspended nanofluid under electric field is significantly enhanced when comparing to the pure base fluid. However, there exists an optimal concentration for the best enhanced effect. Besides, the enhancement of heat transfer results from the heat exchange by nanoparticles, the reduced surface tension of gas-liquid interface and the thermal conductivity enhancement effect. The predicted curves of model agree well with the experimental data. Meanwhile, the models comprehensively consider the effect of heat exchange by nanoparticles, surface tension and thermal conductivity