Brookfield DV-III Ultra Rheometer Manual do Utilizador descarregar pdf (Página 52)

Brookeld Engineering Laboratories, Inc. Page 52 Manual No. M/98-211-B0104

Brookeld Engineering Laboratories, Inc. Page 52 Manual No. M98-211-E0912

Model: HB Spindle: 34

Plastic Viscosity: 1906.3 cP

Yield Stress: 1976.88 D/CM2

Condence of Fit: 63.6 %

The equation for each model is described below with a denition of parameters. Please contact

Brookeld or an authorized representative if further information is required.

Note: The condence of t parameter used in all of the models is an indication

of how well the model ts the data set. 100% indicates the best t.

1. Casson (Standard)

The Standard Casson equation is: √τ = √τo + √ηD where:

τ = Shear Stress

τo = Yield Stress (stress at zero shear rate)

η = Plastic Viscosity

D = Shear Rate

The calculated parameters for this model are:

Plastic Viscosity (cP or mPa•s)

Yield Stress (Dynes/cm2 or N/m2)

Condence of Fit (%)

The Standard Casson method is a direct implementation of the original Casson equation.

2. NCA/CMA Casson (Chocolate)

This Casson method is derived from the standard set forth by the National Confectioners Association

(NCA) and the Chocolate Manufacturers Association (CMA). Although based on the original

Casson equation, this implementation has been tailored by the NCA and CMA specically to

applications involving chocolate.

The Chocolate Casson equation is:

(1+a)√τ = 2√τo + (1+a)√ηD where:

τ = Shear Stress

τo = Yield Stress (stress at zero shear rate)

η = Plastic Viscosity

D = Shear Rate

a = spindle (or bob) radius/ inner cup radius

The calculated parameters for this model are:

Plastic Viscosity (cP or mPa•s)

Yield Stress (Dynes/cm2 or N/m2)

Condence of Fit (%)

3. Bingham Plastic

The Bingham equation is: τ = τo + ηD where:

τ = Shear Stress

τo = Yield Stress (stress at zero shear rate)

η = Plastic Viscosity

D = Shear Rate

The calculated parameters for this model are:

1 2 ... 47 48 49 50 51 52 53 54 55 56 57 ... 132 133

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