In the present study, the effect
of graphene/water nanofluid on
the thermal performance of a two-phase closed thermosiphon (TPCT)
has been considered. For the synthesis of the mentioned nanofluids,
graphene with a thickness of 4–20 nm and length of 5–10
μm has been employed. Due to the natural instability of graphene
in polar solvents such as water, gum arabic (GA) has been utilized
as a surfactant. Then, various nanofluids at weight concentrations
of 0.02–1% were prepared and thermal properties were investigated
at the input power of 30–150 W. In agreement with the results,
as the weight concentration increased, the overall heat transfer coefficient
and thermal efficiency of the TPCT were enhanced. On the other hand,
increasing the nanofluid weight concentration and input power led
to lower thermal resistance of the TPCT. Interestingly, the rate of
change of the temperature in the evaporator has been studied as one
of the key parameters affecting the thermal resistance and overall
heat transfer coefficient of the TPCT. Increasing the concentration
has compounded the reduction of the average temperature of evaporation,
which has confirmed the reduction in thermal resistance. Meanwhile,
the overall heat transfer coefficient increased with rising concentration
at the permanent input power. Also, the vacuum pressure results showed
that increasing the concentration of nanofluid led to the vacuum pressure
drop being intensified.
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