On the pool boiling heat transfer enhancement of distilled water using Cu-nanoparticles textured with carbon nanofibers

Abstract

Enhancement of subcooled and saturation pool boiling is of interest for many applications. The present study proposes coating heated surface using nanotextured of Cu nanoparticles with carbon nanofibers. This texture formation on copper substrate surface passes through different chemical stages under specific conditions. Using electrospinning, coating was carried out at different times (5, 15, and 30 min). After vacuum drying at 60 oC for 24 h, the copper substrates attaching the electrospun mat were calcined at 850 oC under vacuum. and accordingly, different contact angles were measured as 80o, 115o, and 102o. The coated surfaces are coded by S1, S2 and S3 for the electrospun coated surfaces of (5, 15, and 30), respectively.All nanostructured coated surfaces showed a good heat transfer enhancement compared to uncoated copper surface for both HTC and CHF. The results showed an enhancement of HTC by 57.83%, 40.3% for S2 and S3 respectively and an enhancement of CHF by 13.67%, 17.11% and 48.14% for S1, S2 and S3 respectively.