What is a capillary tube viscometer?
What is a capillary tube 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.
What are the examples of capillary viscometer?
Usage Examples 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 does a capillary tube measure?
description. In the capillary tube viscometer, the pressure needed to force the fluid to flow at a specified rate through a narrow tube is measured.
How does Au tube viscometer work?
U-tube viscometers In one arm of the U is a vertical section of precise narrow bore (the capillary). In use, liquid is drawn into the upper bulb by suction, then allowed to flow down through the capillary into the lower bulb. Two marks (one above and one below the upper bulb) indicate a known volume.
What is in the capillary tube?
Capillary tubing or capillary tubes are very thin tubes made of a rigid material, such as plastic or glass in which a liquid flows up into the tubes against gravity in a process called capillary action (capillarity). A fluid’s capillary action can occur in both vertical and horizontal directions.
Which viscometer belongs to rotational viscometer?
Measurement of Viscosity The most popular rotational viscometer is the Couette concentric-cylinder viscometer. Fluid is placed in the annulus between two concentric cylinders (regarded as infinite in the interpretation of data), which are in relative rotation about their common axis.
How is capillary length calculated?
The capillary length is defined by(8.6)a2=2σ/(Δρg),where g = 9.81m/s2 is the acceleration due to gravity.
What is the purpose of a capillary tube?
A capillary tube uses a liquid’s properties of cohesion, adhesion and surface tension to draw the liquid up the interior walls of a narrow tube. This allows a liquid, such as blood or water, to climb up the tube even against the forces of gravity.
What is the principle of viscometer?
Principle of operation. Classical Brookfield viscometers employ the principle of rotational viscometry – the torque required to turn an object, such as a spindle, in a fluid indicates the viscosity of the fluid.
Is a capillary tube a metering device?
CAPILLARY TUBE. The capillary tube is a metering device made from a thin tube approximately 0.5 to 6 metre long and from 0.025 to 0.090 inches in diameter which feeds liquid directly to the evaporator. Usually limited to systems of 1 ton or less, it performs all of the functions of the thermal expansion valve when properly sized.
What are the different types of viscometer?
an instrument for the determination of viscosity . The most common types of viscometer are capillary, rotary, falling-sphere, and ultrasonic.
