Abstract
An experimental study was carried out to evaluate the effect on the thermal performance of a two-phase closed thermosyphon (TPCT) during operation cycles using nanofluids. Al2O3 (0.1 wt.%) based nanofluids with two concentrations of SDBS (0.032 wt.% and 0.064 wt.%) were prepared via two-step method. Stability after nanofluids preparation was evaluated using visual inspection, UV-spectroscopy and dynamic light scattering (DLS). Nanofluids with and without surfactant were used as working fluid in a glass TPCT. Results show that the TPCT thermal resistance was decreased up to 20% respect to water by the presence of nanoparticles and surfactant. A dried limit with water as working fluid was observed and fluid expansion was identified with surfactant presence. Differences in thermal efficiency and temperature profiles using nanofluids with and without surfactant and only surfactant-water as working fluids in TPCT were not significative. However, in evaporator zone, a slight increase of the thermal resistance was identified when surfactant was added. After TPCT operation with nanofluids, nanoparticles agglomeration and sedimentation were observed and a layer on the evaporator surface was observed.
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