Influence of graphene oxide nanofluids and surfactant on thermal behaviour of the thermosyphon

Abstract

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 timedependent 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.

Experimental study on the effect of different surfactants on the thermophysical properties of graphene filled nanofluids

“…Mahmudul et al 29 reported the preparation and thermal behaviors of W/GR nanofluids with sodium dodecyl benzene sulfonate (SDBS) and SDS surfactants. The effects of volume fraction and temperature on viscosity and surface tension of W/GR nanofluids were also studied by Nizar Ahammed 30 . In addition, the SDBS was used as a surfactant for stabilizing the GR suspension.…”

Experimental studies on thermosyphon using low global warming potential refrigerant HFE7000 and nanorefrigerant HFE7000/Al2O3

“…The experimentation concludes that using the silver nanofluid in thermosyphon improves the effectiveness from 20.7% to 40% than pure water. Wlazlak et al 5 examined the thermal behavior of the thermosyphon employing graphene oxide nanofluid and concluded that there is an increase in heat transfer for low heat inputs. Noie et al 6 analyzed the efficiency of the thermosyphon using Al 2 O 3 nanofluid in water.…”

“…It is inferred from the literature that the application of nanoparticle in thermosyphon reduced the thermal resistance, 3 increases heat transfer, 5,13 and efficiency. 4,6 The refrigerants in thermosyphon are useful for low heat applications; besides from literature [16][17][18] it is better to applying the environmental-friendly working fluid in thermosyphon.…”

“…Wlazlak et al. 5 examined the thermal behavior of the thermosyphon employing graphene oxide nanofluid and concluded that there is an increase in heat transfer for low heat inputs. Noie et al.…”

Experimental studies of flow boiling heat transfer by using nanofluids

“…The flow boiling heat transfer of nanofluids is still in its infant stage and needs more investigations by using both experimental and theoretical methods under various operating conditions. Therefore, the efficient design of the above-mentioned industrial applications involves a whole understanding of several significant parameters such as the heat transfer coefficient (HTC), critical heat flux (CHF), vapor quality, pressure drop and the flow instabilities [21,22].…”