| Abstrakt: |
The basic concept of viscosity is outlined along with its range in value; brief descriptions are given of the non-Newtonian sub-divisions of viscosity behaviour which is met with a high proportion of process fluids, and of the physical and chemical basis of viscous behaviour. Practical applications are illustrated to show the potential use of viscosity measurement, and the measuring principles of both laboratory and (in Part 2) process viscometers are briefly discussed, outlining some of the basic limitations to practical measurements with particular reference to shear rate selection in process measurement. Extension of measurement to automatic process control is discussed in the context of past limited availability of practical instrumentation and user demand, but reference is made to the increased usage of microprocessor technology in the latest instruments which should readily aid the extension of process measurement and control in the future. |
