بخشی از پاورپوینت
--- پاورپوینت شامل تصاویر میباشد ----
اسلاید 1 :
- Introduction
- Definition of Viscosity, Shear Stress, Shear Rate
- Measuring Viscosity
- Definitions Flow Behaviour
- Determination of Thixotropy
- Determination of Yield Stress
- Flow Behaviour and Application
- Shear rate calculations of real applications
- Errors
- Calibration of instruments
اسلاید 2 :
How is rheology defined?
uRheology - the “science of flow”
uRheometry - the experimental determination of flow behaviour
today too: of visco-elastic material properties
اسلاید 3 :
What´s rheology useful for?
Flow behaviour and material properties influence:
uProcessing
uProduct Stability
uCustomers Acceptance
Rheology delivers characteristics for
Processing, Product Stability and Customers Acceptance!
اسلاید 4 :
How is viscosity defined?
Viscosity can be determined indirectly by:
Shear Stress Shear Rate
اسلاید 5 :
Typical shear rates
uApplication Shear rate (s-1)
uSedimentation 10-6 - 10-4
uPhase separation 10-6 - 10-4
uLeveling, running 10-1 - 101
uExtrusion 100 - 102
uDip Coatings 101 - 102
uChewing 101 - 102
uPumping, stirring 101 - 103
uBrushing 101 - 104
uSpraying 103 - 104
اسلاید 6 :
Design of Sensors
Cylindrical Sensors
- thin liquids
(large rotor surface)
- filled systems
(wide gaps)
Plate-Cone
- thick substances
- easy to clean
- no particles
- high shear rates
Plate-Plate
- dynamic measurements
(oscillation)
- inhomogeneous materials
(particles, fibres)
اسلاید 7 :
HAAKE RotoVisco® 1
uSpecifications
0.0125 to 1000 rpm
u 0.1 to 5 Ncm
uSensor Systems
cylinders, plate-cone, parallel plates, special rotors
uTemperature range
up to 350°C
uOptions
remote control per display control unit or computer control, QC features
اسلاید 8 :
HAAKE Viscotester® VT550
uSpecifications
0.5 to 800 rpm 0.01 to 3 Ncm
uSensor Systems
cylinders, plate-cone, parallel plates, special rotors
uTemperature range
up to 150°C
uOptions
manual or computer control, implemented and free programmable speed rows and procedures
u
اسلاید 9 :
HAAKE RheoStress®
uSpecifications
0.01 to 1200 rpm (CR);
0.2 mNm to 15 Ncm
uSensor Systems
cylinders, plate-cone, parallel plates, special rotors
uTemperature range
-100°C to 200°C (liquid)
uSpecial Applications
High pressure cell (up to 100 bar/200°C),
high temperature (up to 500°C),
normal force sensor
اسلاید 10 :
Pumping, Mixing and Embottling
Rheologically relevant quantities:
uuViscosity as function of shear rate h=f(g)
uViscosity as function of time h=f(t) ( Thixotropy)
Result: Parameters
for pump design, possible flow rates, thickening!
