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RELAXATION TIME OF POLYMER SOLUTIONS FROM ROD-CLIMBING HEIGHT
Korean Journal of Chemical Engineering, January 1991, 8(1), 18-22(5), 10.1007/BF02697693
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Abstract
When the polymer solution is sheared from the boundary, the induced normal stresses are perpendicular to the planes of shear. The free-surface of the liquid is then deformed in the direction of the rod axis and it gives the rod-climbing height. From this rod-climbing experiment, the relaxation time of a polymer solution can be analyzed.
In this paper, the result of rod-climbing constant for the second-order fluid obtained by previous investigators in being correlated with the rheological properties of the polymer solution and then the relaxation time is calculated. Being compared with other experimental methods, it is found that the relaxation time from this method is rather simple to obtain.
In this paper, the result of rod-climbing constant for the second-order fluid obtained by previous investigators in being correlated with the rheological properties of the polymer solution and then the relaxation time is calculated. Being compared with other experimental methods, it is found that the relaxation time from this method is rather simple to obtain.
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Coleman BD, Markovtz H, Noll W, "Viscometric Flows of Non-Newtonian Fluids," Springer Tracts in Natural Philosophy, Vol. 5, Springer-Verlag, Berlin, Germany (1966)
Joseph DD, Fosdick RL, Arch. Rat. Mech. Anal., 49, 321 (1973)
Joseph DD, Beavers GS, Fosdick RL, Arch. Rat. Mech. Anal., 49, 381 (1973)
Beavers GS, Joseph DD, J. Fluid Mech., 69(3), 475 (1975)
Beavers GS, Joseph DD, J. Fluid Mech., 81(2), 265 (1977)
Bird RB, Curtiss CF, Armstrong RC, Hassager O, "Dynamics of Polymeric Liquids," Vol. 1, John Wiley & Sons, New York (1987)
Criminale WO, Erickson JL, Filbey GL, Arch. Rat. Mech. Anal., 1, 410 (1958)
Tadmor Z, Gogos CG, "Principles of Polymer Processing," John Wiley & Sons, New York (1979)
Boger D, Proc. 8th Int. Congress Rheol., 1, 195 (1980)
Hassager O, J. Rheol., 29(3), 361 (1985)
Choi HJ, Ph.D. Dissertation, Carnegie Mellon University, Pittsburgh, PA (1987)
Muthukumar M, Freed KF, Macromolecules, 11, 843 (1978)
