Surface tension prediction for pure fluids

✍ Scribed by Joel Escobedo; G. Ali Mansoori

• Publisher: American Institute of Chemical Engineers
• Year: 1996
• Tongue: English
• Weight: 896 KB
• Volume: 42
• Category: Article
• ISSN: 0001-1541
• DOI: 10.1002/aic.690420523

✦ Synopsis

For the surface tension of otganic compounds, (+ = [ 6 -( p , -p,)I4 is proposed where 6 = 6,.(1-T,)0.37.T,.exp(0.30066/T, + 0.86442.T:). p! and pu are molar densities of liquid and vapor, respective&, T, = T/T,, and CP, is a temperature-independent, compound-dependent constant similar to Sugden ' s parachor, This new expression, derived from statistical-mechanics, represents the experimental surj4ace tension data of 94 different organic compounds within 1.05 AD%. We also propose So = 39.6431-(0.2221 7 -2.91042 X 10-3*( (R*/T,',).T,'3p2/P:/6 as a corresponding-states expression to correlate the temperature-independent parameter 6, for various compounds. Here, (R* = 6tm/6tm,ref, ( R , is the molar refraction, a,,,,, is the molar refraction of the reference fluid (methane), and Tbr is the reduced normal boiling point. When this generalized expression is used, s u ~a c e tensions for all 94 compounds can be predicted within 2.57 AAD% at all temperatures investigated.