## Volume viscosity

to the divergence of the velocity field. This constant of proportionality is called the volume **viscosity** . Volume **viscosity** appears in the Navier-Stokes equation if it is written for compressible fluid , as described in the most books on general hydrodynamics [ 1 ] , [ 2 ] , and acoustics

**wikipedia.org**| 2010/9/26 13:47:32

## Intrinsic viscosity

where η 0 is the **viscosity** in the absence of the solute and φ is the volume fraction of the solute in the solution. As defined here, the intrinsic **viscosity** is a dimensionless number. When the solute particles are rigid spheres , the intrinsic **viscosity** equals 2.5, as shown first by

**wikipedia.org**| 2011/3/4 8:10:37

## Viscosity index

The **viscosity** of liquids decreases as temperature increases. The **viscosity** of a lubricant is closely related to its ability to reduce friction . Generally, the least viscous lubricant which still forces the two moving surfaces apart is desired. If the lubricant is too viscous, it will

**wikipedia.org**| 2011/5/26 17:22:52

## Blood viscosity

In pascal - seconds (Pa·s), the **viscosity** of blood at 37°C is normally 3*10 -3 to 4*10 -3 . [ 4 ] The analogous unit in the centimetre gram second system of units is Poise , and the **viscosity** of blood at 20°C is normally 10 centipoise (cP). [ 5 ] Plasma **viscosity** is determined by

**wikipedia.org**| 2011/2/23 20:52:14

## Extensional viscosity

where is the extensional **viscosity** or elongational **viscosity** is the normal stress : is the rate of strain : For a Newtonian Fluid , the elongational **viscosity** is three times the shear **viscosity** which can be derived using the continuity equation for incompressible fluids.

**wikipedia.org**| 2010/9/25 2:53:40

## Viscosity solution

In mathematics , the **viscosity** solution concept was introduced in the early 1980s by Pierre-Louis Lions and Michael Crandall as a generalization of the classical concept of what is meant by a 'solution' to a partial differential equation (PDE). It has been found that the **viscosity** solution

**wikipedia.org**| 2011/5/25 18:35:22

## Temperature dependence of liquid viscosity

The temperature dependence of liquid **viscosity** is the phenomenon by which liquid **viscosity** tends to decrease (or, alternatively, its fluidity tends to increase) as its temperature increases. This can be observed, for example, by watching how cooking oil appears to move more fluidly upon

**wikipedia.org**| 2010/9/25 2:46:27

## Viscosity printing

Three to four colors of ink are mixed, each of a different **viscosity** . This property is adjusted by the addition of solvents such as linseed oil. Metal plates, usually copper or zinc, are used, as in the intaglio processes. The artist produces images on the plate by etching lines or textures

**wikipedia.org**| 2011/2/26 1:02:07

## Apparent viscosity

For this article, apparent **viscosity** is described, as used in drilling fluid applications in the Oil exploration industry . There may be other applications in other fields of study such as fluid mechanics (The study of the movement of fluid) or fluid dynamics (The study of the flow of fluid

**wikipedia.org**| 2010/9/25 5:13:22