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 flow 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.
This is a preview of subscription content, log in to check access.
Buy single article
Instant access to the full article PDF.
Price includes VAT for USA
- Lc :
- \(\dot m\) :
Mass flow rate
Volume flow rate
- Φ C :
- Φ F :
Falling tube diameter
- γ :
Entrance & and exit
Final or infinite
Bird, R. B., Amstrong, R. C., Hassager, 0., 1987,Dynamics of Polymeric Liquids, Vol. 1, Wiley, New York.
Cho Y. I., Kim, W. T., and and Kensey, K. R., 1999, “A New Scanning Capillary Tube Viscometers,”Review of Scientflc Instruments, Vol. 70, pp. 2421–2423.
Kim, S., Cho, Y. I., Jeon, A. H., Hogenauer, B., and Kensey, K. R., 2000, “A New Method for Blood Viscosity Measurements,”J. Non-Newtonian Fluid Mech., Vol. 94, pp. 47–56.
Macosko, C. W., 1993,Rheology: Principles, Measurements, and Applications, VCH, New York.
Middleman, S., 1968,The Flow Flow of High Polymers, Interscience, New York.
Munson, B. R., Young, D. F., and Okishi, T. Hl, 1998,Fundamentals of Fluid Mechanics, Wiley, New York, (Chapter 8).
Nguyen Y. T., Vu, T. D., Wong, H. K. and Yeow, Y. L., 1999, “Solving the Inverse Problem of Capillary Viscometry by Tikhonow Regularization,”J. Non-Newtonian Fluid Mech., Vol. 87, pp. 103–116.
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.
Shin, S., Lee, S. and Keum, D., 2001, “A New Mass-Detecting Capillary Viscometer,”Review of Scientific Instrument, Vol. 72, pp. 3127–3128. 262–269
About this article
Cite this article
Shin, S., Keum, D. Continuous viscosity measurement of non-Newtonian fluids over a range of shear rates using a mass-detecting capillary viscometer. KSME International Journal 16, 255–261 (2002). https://doi.org/10.1007/BF03185177
- Non-Newtonian Fluids
- Shear Rates
- Capillary Viscometer