What is a capillary viscosimeter?
The capillary viscosimeter is a device used to measure viscosity or liquid thickness by measurement, how long the fluid takes over a tube with a small diameter or capillary. Flow or Eflux is a time proportional to the kinematic viscosity of the liquid and can be converted directly into viscosity using a conversion factor unique for each tool. The viscosity is generally dependent on the temperature, so the capillary viscosimeter is usually used in a water bath with a controlled temperature set to a specific temperature. Viscosity
viscosity can be considered as an internal friction of the liquid or its tendency to resist the flow. Viscosity is therefore an important feature of fluids. It is a critical concern for lubricants, colors, drinks and in any case, when the liquid must be transmitted, mixed or manipulated.
The capillary viscosimeter can take any of the several designs, but the most common is U or Ostwald viscome, the Cannon-Fenske and Ubbelohde Types are typical. Capillary viscosimeter for the cannon-Fenske JE piece of glass hose in the shape of the letter U for two glass bulbs or chamber on one arm, separated by calibrated length of the capillary tube. Another bulb is low on the second arm to which the sample is charged. The sample and capillary viscosimeter are then suspended in a water bath with a fixed temperature and left to the thermal balance.
Once the thermal balance is achieved, the sample is drawn into the upper house and the test begins. The test sample is allowed to flow from the upper chamber to the lower capillary and measured the discharge time or the time required to browse the length of the capillary. The capillary viscosier comes with the conversion factor delivered by the manufacturer, which allows the calculation of kinematic viscosity directly from the eflux time.
for high visCozity liquids, solving these submersion to be used dances in suitable solvent and measurement of solutions viscosity at various concentrations specified. The design of the graph of theThe oust concentration versus viscosity allows the viscosity of pure liquid to be found by extrapolation of the graph at the concentration of the zero solvent.
In Standard International (SI), viscosity is measured in PA*S or Pascal seconds. However, this is relatively high for most fluids and it is more common to measure viscosity in MPA*S or Milli-Pascal*second, a thousandth Pascal*seconds. In the CGS sysyt, still used by the American company for testing and materials, it is a unit of Viscosity viscosity or usually Centipoise (CP), which is a hundred Poise. Both the SI and the CGS system are based on the metric system, so the conversion between them is simple and 1 cp equals 1 MPa*s