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- W1595979080 abstract "The effects on pool boiling characteristics such ascritical heat flux and the heat transfer coefficient of differentsurface characteristics such as surface wettability, roughness,morphology, and porosity are not well understood. Layer-by-layernanoparticle coatings were used to modify the surface of a sapphireheater to control the surface roughness, the layer thickness, andthe surface chemistry. The surface was then tested in a waterboiling test at atmospheric pressure while imaging the surface withhigh speed infrared thermography yielding a 2D time dependenttemperature profile. The critical heat flux and heat transfercoefficient were enhanced by over 100% by optimizing the surfaceparameters. It was found that particle size of the nanoparticles incoating, the coating thickness, and the wettability of the surfacehave a large impact on CHF and the heat transfer coefficient.Surfaces were also patterned with hydrophobic islands within ahydrophilic sea by coupling the Layer-by-layer nanoparticlecoatings with an ultraviolet ozone technique that patterned thewettability of the surface. The patterning was an attempt toincrease the nucleation site density with hydrophobic dots whilestill maintaining a large hydrophilic region to allow for rewettingof the surface during the ebullition cycle and thus maintaining ahigh critical heat flux. The patterned surfaces exhibited similarcritical heat fluxes and heat transfer coefficients to the surfacesthat were only modified with layer-by-layer nanoparticle coatings.However, the patterned surfaces also exhibited highly preferentialnucleation from the hydrophobic regions demonstrating an ability tocontrol the nucleation site layout of a surface and opening anavenue for further study." @default.
- W1595979080 created "2016-06-24" @default.
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- W1595979080 date "2011-01-01" @default.
- W1595979080 modified "2023-09-27" @default.
- W1595979080 title "Nano-engineering the boiling surface for optimal heat transfer rate and critical heat flux" @default.
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