Journal
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
Volume 136, Issue 2, Pages 843-855Publisher
SPRINGER
DOI: 10.1007/s10973-018-7632-x
Keywords
Thermosyphon; Nanofluid; Geyser boiling; Graphene oxide; Surfactant
Funding
- NanoUptake COST Action (European Cooperation in Science and Technology) [MF140079]
- [CA15119]
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The paper presents a thermal performance analysis of a thermosyphon filled with graphene oxide nanofluid. It focuses on factors influencing thermal resistance and geyser boiling processes, such as the presence of surfactant (here: sodium dodecyl sulphate), the time-related deterioration of nanoparticles, and working conditions. Results indicate that GO nanofluids improved heat transfer at low heat loads and that enhancements were limited to the evaporator section. Although thermal resistance of the device was similar for all tested working fluids at high evaporator temperatures, the time-dependent behaviour was different. Both water and GO nanofluid facilitated geyser boiling. Sodium dodecyl sulphate inhibited the phenomenon for pure water, but the same concentration of surfactant in the graphene oxide nanofluid did not show the same effect. SEM analysis showed that substantial amount of surfactant attached to the surface of graphene oxide flakes, which explains the previously described behaviour.
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