What is capillary viscometer?

What is capillary viscometer?

A capillary viscometer is an instrument used to measure the viscosity, or thickness, of a liquid by measuring how long it takes the liquid to flow through a small-diameter tube, or capillary.

Which is the example of capillary viscometer?

Capillary viscometers are used to measure the viscosity of a wide range of diverse fluids. Common examples include petroleum products, lubricants, adhesives, and sealants.

What is the principle of viscometer?

These viscometers use the principle of ‘rotational viscometry’, i.e. their measurement of product viscosity is based upon immersing a specifically selected spindle within a sample of the product followed by measurement of the torque required to rotate the spindle at a set speed whilst immersed within the product sample …

What is capillary flow method?

Capillary flow porometry (CFP) is a pore size measurement technique that uses liquid expulsion calculation for the measurement of the sizes of pores that penetrate completely through a solid, so-called through pores.

How does a cone and plate viscometer work?

“Cone and plate” viscometers use a narrow-angled cone in close proximity to a flat plate. With this system, the shear rate between the geometries is constant at any given rotational speed. The viscosity can easily be calculated from shear stress (from the torque) and shear rate (from the angular velocity).

What are the limitations of capillary viscometer?

The capillary viscometer has a number of limitations which are listed below: 1) The rate of strain can not be easily manipulated in a continuous manner. 2) It is not possible to measure the normal stress differences. 3) Dynamic measurements are not possible.

How is viscometer measured?

Also known as u-tube or glass viscometers, capillary viscometers are often used in laboratory settings. Viscosity is measured by timing how long it takes for a transparent or translucent fluid to flow between two points of a capillary tube.

How does a capillary viscometer measure viscosity?

Fluid passes from the higher bulb to the lower bulb through a capillary, and viscosity is measured by timing how long it takes the fluid to pass through the tube.