Mixed indicators

→ Graphical representation of the mixed key figures

REX/PSI provides both analytical mixing indicators and regression models based on numerical simulations of the mixing effect of different zone types.

In theshort report and in the Mixture triangle three mixing ratios are displayed for the calculated screw.

The transverse mixing ratio $\pi_{LSM}$ is calculated as follows: $$\pi_{LSM} = \left[ 1 + \left(c_0 \overline{\gamma} \right)^2 \right]^{-1/2}$$ $$\text{with}$$ $$\overline{\gamma} = \frac{2 \left(1.03 + 0.074n \right) L}{\cos\varphi \sin\varphi} \cdot \frac{1}{h_1 \, \pi_\dot{m}}$$ $$\text{and}$$ $$c_0 = c_1 \sqrt{\frac{h_1}{h_0}} \left(\frac{T_z}{T_0}\right)^{c_2} \frac{n^{c_3}}{\pi_\dot{m}}$$

with c1=0.08367, c2=0.7067 and c3=0.344

The longitudinal mixing ratio $\sigma^2$ is calculated as follows

$$\sigma^2 = 1 + \exp(c_1 \Theta_{min}^{c_2}) - \exp(c_3 \Theta_{min})$$

with the dimensionless minimum residence time $\Theta_{min} = \frac{t_{min}}{\bar{t}}$ and

The agglomerate size reduction ratio $Z$ is calculated as follows:

$$Z=\left[ 1+\left( \frac{t}{c_{31}}\right)^{c_{21}}\left( ln\left( \frac{\tau}{\tau_{min}}\right)\right)^{1/c_{11}}\right]^{-1}$$

with the current shear stress $\tau$, the minimum shear stress $\tau_{min}$ and the three decay constants $c$. The minimum shear stress and the three decay constants are Material parameters. REX offers default values at the push of a button.

• Regular calculation
• Throughput
• Pressure profile
• Melting profile
• Temperature profile
• Power and wall shear stress
• Residence time
• Mixed indicators
• Material degradation
• Fiber length degradation
• Degassing index calculation
• Stress Analysis
• Drag pressure flow
• Solids conveying
• Processing of mixtures
• Wall-slipping Materials
• Grooved bush
• Compression ratio & Pumping ratio