## Acoustic rheometer

modulus in terms of acoustic properties, sound speed V and attenuation α Acoustic **rheometer** measures sound speed and attenuation of ultrasound for a set of frequencies in megahertz range. These measurable parameters can be converted into real and imaginary components

**wikipedia.org**| 2010/9/25 22:23:36

## 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. [ edit

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

## Annular velocity

complicated procedures and equipment for its determination. For drilling fluid applications a **rheometer** is used. [ edit ] See also Fluid Dynamics Drilling fluid Rheology Mud Engineer Petroleum Engineering Drilling rig Oilfield Oil well Oil field acronyms List of oilfield service

**wikipedia.org**| 2010/9/26 14:24:47

## Spheronisation

In addition to this the process is useful in several aspects to improve the product; it can simplify plant procedures and help to reduce costs. The process is well known and widely used in the pharmaceutical industries but its use is becoming increasing recognized in other areas of industrial

**wikipedia.org**| 2011/4/17 0:44:57

## Apparent viscosity

cP = centipoise 1 Centipoise = One hundredth of a poise x = The θ600 rpm reading from a **rheometer** rpm = Revolutions per minute [ edit ] Application The apparent viscosity [2] is but one of many calculations derived from tests performed on the drilling fluid . These calculations

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