Effect of nanofluids on reflood heat transfer in a long vertical tube |
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Authors: | Seung Won Lee Se Young Chun Chul Hwa Song In Cheol Bang |
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Affiliation: | 1. Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology (UNIST), 100 Banyeon-ri, Eonyang-eup, Ulju-gun, Ulsan Metropolitan City 689-798, Republic of Korea;2. ThermalHydraulics Safety Research Division, Korea Atomic Energy Research Institute (KAERI), 1045 Daedeokdaero, Yuseong, Daejeon 305-353, Republic of Korea |
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Abstract: | Experiments were conducted to investigate the effect of nanofluids on reflood heat transfer in a hot vertical tube. The nanofluids, which are produced by dispersing nano-sized particles in traditional base fluids such as water, ethylene glycol, and engine oil, are expected to have a reasonable potential to enhance a heat transfer. 0.1 volume fraction (%) Al2O3/water nanofluid was prepared by two-step method and 0.1 volume fraction (%) carbon nano colloid (CNC) was prepared by the process self-dispersing by carboxyl formed particle surface. Transmission electron microscopy (TEM) images are acquired to characterize the shape and size of Al2O3 and graphite nanoparticles. The dispersion behavior of nanofluids was investigated with zeta potential values. And then, the reflood tests have been performed using water and nanofluids. We have observed a more enhanced cooling performance in the case of the nanofluid reflood. Consequently, the cooling performance is enhanced more than 13 s and 20 s for Al2O3/water nanofluid and CNC. |
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