Abstract
Surface tension of pure fluids, inherently decreasing with regard to temperature, creates a thermo-capillary-driven (Marangoni) flow moving away from a hot surface. It has been known that few high-carbon alcohol-aqueous solutions exhibit an opposite behavior of the surface tension increasing with regard to temperature, such that the Marangoni flow moves towards the hot surface (self-rewetting effect). We report the surface tensions of three dilute aqueous solutions of n-Butanol, n-Pentanol and n-Hexanol as self-rewetting fluids measured for ranges of alcohol concentration (within solubility limits) and fluid temperatures (25–85 °C). A maximum bubble pressure method using a leak-tight setup was used to measure the surface tension without evaporation losses of volatile components. It was found from this study that the aqueous solutions with higher-carbon alcohols exhibit a weak self-rewetting behavior, such that the surface tensions remain constant or slightly increases above about 60 °C. These results greatly differ from the previously reported results showing a strong self-rewetting behavior, which is attributed to the measurement errors associated with the evaporation losses of test fluids during open-system experiments.
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Abbreviations
- a i :
-
Experimental coefficients in calculating mixture density
- C :
-
Mass concentration (% wt)
- h :
-
Height (m)
- m :
-
Mass (kg)
- P :
-
Pressure (pa)
- R :
-
Capillary tube radius (m)
- s :
-
Interfacial coordinate (m)
- T :
-
Temperature (K)
- U :
-
Uncertainty (%)
- X :
-
Calculated variable
- Y :
-
Measured variable
- Δ:
-
Change in variable
- ρ :
-
Density (kg/m3)
- σ :
-
Surface tension (mN/m)
- 1, 2, 3:
-
Location indexes
- b :
-
Bubble
- c :
-
Critical
- f :
-
Fluid
- i :
-
Index number
- max:
-
Maximum
- min:
-
Minimum
- v :
-
Vapor
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Acknowledgements
Authors thank Roberto Bejarano for his work on the initial experiments. The work was supported by the National Science Foundation (IIA-1301726 and CAREER Award 1464504). The views expressed herein are those of the authors and do not necessarily reflect the views of the National Science Foundation.
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Cheng, K.K., Park, C. Surface tension of dilute alcohol-aqueous binary fluids: n-Butanol/water, n-Pentanol/water, and n-Hexanol/water solutions. Heat Mass Transfer 53, 2255–2263 (2017). https://doi.org/10.1007/s00231-017-1976-9
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DOI: https://doi.org/10.1007/s00231-017-1976-9