Abstract
The effect of using a surfactant on heat transfer rates in a two-phase closed thermosyphon (TPCT) in an operating state was investigated. A TPCT was made from copper tubes with 7.5, 11.1, and 25.4 mm international diameters and aspect ratios of 5, 10, and 20 . The filling ratios chosen were 30, 50, and 80% with respect to the evaporator length. Three working fluids were investigated: a silver nanofluid with a concentration of 0.5 wt% containing 0.5, 1, and 1.5 wt% of oleic acid. The operating temperatures were 40, 50, and 60°C. This research reports the effect of the following dimensionless parameters on heat transport: , Pr, Bo, Ja, Pe, Co, Cd, Ar, Z, and Ku. It was further found that the filling ratio had no effect on the ratio of heat transfer rates in the vertical position, but the properties of the working fluid affected the heat transport. In addition, a correlation for predicting the heat flux for the two-phase closed thermosyphon in the vertical position was established.
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