Abstract
In this study, electrohydrodynamic (EHD) and nanofluid were synergistically employed to improve minichannel flow boiling. R141b, TiO2/R141b and TiO2/Span80/R141b nanofluids are employed as working fluids. Flow boiling characteristics in minichannels under electric field were evaluated experimentally. Laser confocal microscope was used to examine the effect of EHD and surfactant on nanofluid stability, particularly nanoparticle deposition on heated surfaces. Electric field can effectively enhance heat transfer, and the enhancement is more significant for nanofluids compared to pure fluid. Heat transfer performance is higher for TiO2/R141b than TiO2/Span80/R141b, while TiO2/Span80/R141b shows higher pressure drop than TiO2/R141b. The maximum enhancement ratio of 1.58 and 1.85 is found for TiO2/R141b and TiO2/Span80/R141b under electric field. Besides, heat transfer mechanism enhanced by EHD and nanofluid was discussed. Nanofluid stabilization induced by electric field and surfactant play crucial role in EHD enhancement for nanofluid. The findings suggest that TiO2/Span80/R141b nanofluid is well-suited for integration with EHD.
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