Chemical Engineering - Mass Transfer - Discussion
Discussion Forum : Mass Transfer - Section 1 (Q.No. 50)
50.
Mass transfer co-efficient (K) and diffusivity (D) are related according to film theory as
Discussion:
5 comments Page 1 of 1.
Chandana Devi said:
2 years ago
Film Theory: k=D/S (D= diffusivity, S = film thickness).
Penetration Theory: k=√(D/πt) --> instantaneous mass transfer coefficient.(t= time)
k=2√(D/πt) --> average mass transfer coefficient.
Surface Renewal Theory: k=√(D*S) --> (S= surface renewal rate).
Penetration Theory: k=√(D/πt) --> instantaneous mass transfer coefficient.(t= time)
k=2√(D/πt) --> average mass transfer coefficient.
Surface Renewal Theory: k=√(D*S) --> (S= surface renewal rate).
(3)
Amit Gupta said:
5 years ago
Flim theory by Lewis and Whitman= k proportional to D.
Penetration theory by Higbie = k proportional to D^0.5.
Surface renewal by Dankwarts = k proportional to D^0.5.
Penetration theory by Higbie = k proportional to D^0.5.
Surface renewal by Dankwarts = k proportional to D^0.5.
(6)
Alpesh Solanki said:
5 years ago
For penetration also k is proportional to D.
Rahul said:
6 years ago
Film theory: K proportional to d.
Penetration theory: K proportional to D.
Surface renewal theory: K proportional to D^2.
Penetration theory: K proportional to D.
Surface renewal theory: K proportional to D^2.
Vinod kumar said:
9 years ago
For film theory K * DELTA C = -D * DELTA C/L.
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers