Journal of Mechanical Science and Technology

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지

Continuous Viscosity Measurement of Non-Newtonian Fluids over a Range of Shear Rates Using a Mass-Detecting Capillary Viscometer

  • Sehyun Shin (School of Mechanical Engineering, Kyungpook National University) ;
  • Keum, Do-Young (School of Mechanical Engineering, Kyungpook National University)
  • Published : 2002.02.01
Download PDF
⟨ Previous Next ⟩

Abstract

A newly designed mass-detecting capillary viscometer uses a novel concept to continuously measure non-Newtonian fluids viscosity over a range of shear rates. A single measurement of liquid-mass variation with time replaces the now rate and pressure drop measurements that are usually required by capillary tube viscometers. Using a load cell and a capillary, we measured change in the mass flow rate through a capillary tube with respect to the time, m(t), from which viscosity and shear rate were mathematically calculated. For aqueous polymer solutions, excellent agreement was found between the results from the mass-detecting capillary viscometer and those from a commercially available rotating viscometer. This new method overcomes the drawbacks of conventional capillary viscometers meassuring non-Newtonian fluid viscosity. First, the mass-detecting capillary viscometer can accurately and consistently measure non -Newtonian viscosity over a wide range of shear rate extending as low as 1 s$\^$-1/. Second, this design provides simplicity (i. e., ease of operation, no moving parts), and low cost.

Keywords

References

  1. Bird, R.B., Amstrong, R.C. and Hassager, O., 1987, Dynamics of Polymeric Liquids, Vol. 1, Wiley, New York
  2. Cho, Y.I., Kim, W.T. and Kensey, K.R., 1999,'A New Scanning Capillary Tube Viscometers,' Review of Scientific Instruments, Vol. 70, pp. 2421-2423 https://doi.org/10.1063/1.1149771
  3. Kim, S., Cho, Y.I., Jeon, A.H., Hogenauer, B. and Densey, K.R., 2000,'A New Method for Blood Viscosity Measurements,' J. Non-Newtonian Fluid Mech., Vol.94, pp. 47-56 https://doi.org/10.1016/S0377-0257(00)00127-0
  4. Macosko, C.W., 1993, Rheology:Principles, Measurements, and Applications, VCH, New York
  5. Middlesman, S., 1968, The Flow Flow of High Polymers, Interscience, New York
  6. Munson, B.R., Young, D.F. and Okishi, T.H, 1998, Fundamentals of Fluid Mechanics, Wiley, New York(Chapter 8)
  7. Nguyen, Y.T., Vu, T.D., Wong, H.K. and Yeow, Y.L., 1999, 'Solving the inverse problem of capillary viscometry by Tikhonov regularisation,' J. Non-Newtonian Fluid Mech., Vol. 87, pp. 103-116 https://doi.org/10.1016/S0377-0257(99)00057-9
  8. Shin, S. and Cho, Y.I., 1993, 'Temperature effect on the non-Newtonian viscosity of an aqueous polyacrylamide solution,' Int. Comm. Heat Mass Transfer., Vol. 20, pp. 831-844 https://doi.org/10.1016/0735-1933(93)90037-V
  9. Shin, S., Lee, S. and Keum, D., 2001, 'A New Mass-Detecting Capillary Viscometer,' Review of Scientific Instrument, Vol. 72, pp. 3127-3128 https://doi.org/10.1063/1.1378339