An investigation of the effect of nanoparticle composition and dimension on the heat transfer coefficient during flow boiling of aqueous nanofluids in small diameter channels (1.1 mm)
作者： Tiago Augusto Moreira , Francisco Júlio do Nascimento , Gherhardt Ribatski , Heat Transfer Research Group
DOI: 10.1016/J.EXPTHERMFLUSCI.2017.07.020
关键词: Deposition (phase transition) 、 Thermodynamics 、 Nucleate boiling 、 Surface roughness 、 Nanoparticle 、 Heat transfer coefficient 、 Chemical engineering 、 Nucleation 、 Heat transfer 、 Nanofluid 、 Materials science
摘要: Abstract The present paper concerns an experimental investigation of the effect adding nanoparticles to DI-water on heat transfer coefficient during flow boiling in a 1.1 mm ID tube. Results were obtained for and solutions Al 2 O 3 (20–30 nm)/DI-water, (40–80 nm)/DI-water, SiO (80 nm)/DI-water, (15 nm)/DI-water Cu (25 nm)/DI-water volumetric concentrations 0.001, 0.01 0.1%. Additional results pure before after performing tests with nanofluids order evaluate deposition due process coefficient. Experiments carried out fluxes up 350 kW/m , mass velocities ranging from 200 600 kg/m s, vapor qualities 0.5 saturation temperatures at test section outlet 102 °C. An analysis surface roughness characterization its texture using optical profiler also performed experiments nanofluids. According most results, is lower than tube without deposition. data analyses revealed that dimension affects behavior. This fact associate density active nucleation sites. hypothesis corroborated by characteristics depends size.
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