A small liquid drop is placed on a solid surface. When the liquid-solid contact radius is 1=0.5 mm, the contact angle is measured to be 90° (note the contact radius here refers to the radius of the contact area). The liquid line tension here is r =0.5 nN, and the liquid surface tension is 50 mN/m. (a) How does the contact angle change with the liquid-solid contract radius r? How does the contact angle change when the r-0.5 nN? (b) Plot the contact 8 as a function of r for both cases (i.e. r,=0.5 nN and r, =-0.5 nN)

A small liquid drop is placed on a solid surface. When the liquid-solid contact radius is 1=0.5 mm, the contact angle is measured to be 90° (note the contact radius here refers to the radius of the contact area). The liquid line tension here is r =0.5 nN, and the liquid surface tension is 50 mN/m. (a) How does the contact angle change with the liquid-solid contract radius r? How does the contact angle change when the r-0.5 nN? (b) Plot the contact 8 as a function of r for both cases (i.e. r,=0.5 nN and r, =-0.5 nN)

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter5: Analysis Of Convection Heat Transfer

Section: Chapter Questions

Problem 5.5P: Evaluate the dimensionless groups hcD/k,UD/, and cp/k for water, n-butyl alcohol, mercury, hydrogen,...

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