An experimental study on flow boiling characteristics of pHEMA nano-coated surfaces in a microchannel
Khalili Sadaghiani, Abdolali and Şişman, Yağmur and Özaydın İnce, Gözde and Koşar, Ali (2015) An experimental study on flow boiling characteristics of pHEMA nano-coated surfaces in a microchannel. In: ASME 2016 5th Micro/Nanoscale Heat and Mass Transfer International Conference, Biopolis, Singapore (Accepted/In Press)
In this study, the effect of pHEMA (Polyhydroxyethylmethacrylate) nanostructure coated surfaces on flow boiling was investigated in a rectangular microchannel. Experiments were conducted using deionized water as the working fluid to investigate flow boiling in a microchannel with dimensions of 14 cm length, 1.5 cm width, and 500 µm depth. The effect of pHEMA coatings (coated on 1.5 × 1.5 cm2 silicon plates) on heat transfer coefficients and flow patterns was assessed and supported using a high speed camera system. Although the contact angle decreases on nano-coated surfaces, due to surface porosity, boiling heat transfer coefficient increases. Furthermore, visualization results indicated that uncoated surfaces experienced a smaller nucleate boiling region. It was also observed that dryout occurs at higher heat fluxes for coated surfaces.
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