Which type of viscosity is measured by Brookfield viscometer?

Which type of viscosity is measured by Brookfield viscometer?

The Brookfield Dial Viscometer measures fluid viscosity at given shear rates. Viscosity is a measure of a fluid’s resistance to flow.

What is Fann viscometer?

1. n. [Drilling Fluids] Also known as direct-indicating viscometer or V-G meter, an instrument used to measure viscosity and gel strength of drilling mud. The direct-indicating viscometer is a rotational cylinder and bob instrument.

How does a Fann VG meter work?

Fann VG Viscometer: The V-G meter is a rotational type viscometer in which the fluid is contained between coaxial cylinders. The outer cylinder rotates at a constant speed and the viscous drag of the fluid on the inner cylinder or bob exerts a torque that is indicated on a calibrated dial.

What is Brookfield viscosity test?

The Brookfield Dial Reading Viscometer measures fluid viscosity at given shear rates. Viscosity is a measure of a fluid’s resistance to flow.

What are the three types of viscosity?

Types of Viscosity

• Dynamic Viscosity. Dynamic viscosity measures the ratio of the shear stress to the shear rate for a fluid.
• Kinematic Viscosity. Kinematic viscosity measures the ratio of the viscous force to the inertial force on the fluid.
• Common Units.
• Newtonian Fluids.
• Non-Newtonian Fluids.

What is a Fann 35?

The Fann Model 35 Viscometer is widely known as the “Standard of the Industry” for drilling fluid viscosity measurements. The Model 35 Viscometer is a versatile instrument for research or production use.

What is the gel strength?

Gel strength can be defined as a measure of the ability of a colloidal dispersion to develop and retain a gel form based on its resistance to shear. From: Drilling Engineering, 2021.

What is PV and YP in drilling mud?

PV represents the viscosity of a mud when extrapolated to infinite shear rate on the basis of the mathematics of the Bingham model. (Yield point, YP, is the other parameter of that model.) A low PV indicates that the mud is capable of drilling rapidly because of the low viscosity of mud exiting at the bit.

What is the viscosity of plastic?

Plastic viscosity (PV) can be defined as the resistance offered by a fluid to flow freely. This resistance is a result of friction between the liquid undergoing deformation under shear stress and the solids and liquids present in the drilling mud.

What is LV in Brookfield viscometer?

LV is for low viscosity materials and can measure the thinnest materials. Typical examples include inks, oils, and solvents. RV is for medium viscosity materials than those measured with an LV torque.

How do you calculate viscosity?

There are several formulas and equations to calculate viscosity, the most common of which is Viscosity = (2 x (ball density – liquid density) x g x a^2) ÷ (9 x v), where g = acceleration due to gravity = 9.8 m/s^2, a = radius of ball bearing, and v = velocity of ball bearing through liquid.

What is cup and bob viscometer?

They measure the torque required to rotate a disk or bob in a fluid at a known speed. “Cup and bob” viscometers work by defining the exact volume of a sample to be sheared within a test cell; the torque required to achieve a certain rotational speed is measured and plotted.

What is the viscosity of a gel?

The viscosity of a regular UV or LED cured gel in nail products will range from approximately 25,000 centipoise to 100,000 centipoise. Centipoise is the unit of measurement for viscosity. A builder gel will have a higher viscosity than regular gel. Many builder gels have a viscosity of approximately 350,000 centipoise.

How do you increase gel strength?

Bentonite content has a direct influence on gel strength of drilling fluid. For example, lower yield bentonite gives a higher gel strength because of the increased platelet density in the fluid. Polymer additives can also be used to increase gel strength without making a significant change to viscosity.

How do you calculate YP and PV?

The plastic viscosity (PV) of the drilling fluid is calculated by subtracting the 300-rpm shear stress (R300) from the 600-rpm shear stress (R600). The yield point of the drilling fluid (YP) is calculated by subtracting the PV from the R300 reading. Multiplying the rpm by 1.7 changes the units to re- ciprocal seconds.