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Heat and Mass Transfer

, Volume 53, Issue 7, pp 2255–2263 | Cite as

Surface tension of dilute alcohol-aqueous binary fluids: n-Butanol/water, n-Pentanol/water, and n-Hexanol/water solutions

  • Kuok Kong Cheng
  • Chanwoo ParkEmail author
Original

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.

Keywords

Surface Tension Heat Pipe Evaporation Loss Bubble Pressure Surface Tension Data 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

List of symbols

ai

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

Greek letters

Δ

Change in variable

ρ

Density (kg/m3)

σ

Surface tension (mN/m)

Subscripts

1, 2, 3

Location indexes

b

Bubble

c

Critical

f

Fluid

i

Index number

max

Maximum

min

Minimum

v

Vapor

Notes

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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Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringUniversity of NevadaRenoUSA
  2. 2.Department of Mechanical and Aerospace EngineeringUniversity of MissouriColumbiaUSA

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