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Nomenclature
Latin Symbols
| Symbol | Meaning | Symbol | Meaning |
|---|---|---|---|
| $A,B,C$ | Coefficients of the Carreau Law | $S$ | Specific energy input |
| $A$ | Overall cross section of the screw channel | $S_{Ma}$ | Overall specific energy input of the entire machine |
| $A$ | Parameter for the temperature calculation in the melt film | $S_{Ve}$ | Specific energy input in the processing unit |
| $A_{1-4}$ | Area | $T$ | Temperature |
| $A_{1-4}$ | Variables for the calculation of the starting temperature profile | $T_{A,E}$ | Temperature at the beginning, end |
| $A_{\Delta}$ | Area of the triangular gap between kneading discs | $T_B,T_0$ | Reference temperature |
| $A_f$ | Filled cross section within a screw channel | $T_i$ | Mass temperature at the location i |
| $A_{fr}$ | Free cross section | $T_F$ | Solids temperature |
| $A_{Pr}$ | Cross section of the screw profile | $T_1$ | Reference temperature |
| $\overline{A_{zw}}$ | Average free surface in the intermeshing region | $T_{Fl}$ | Flow temperature |
| $A_{Zyl}$ | Cross sectional area of the barrel | $T_G$ | Glass transition temperature |
| $B$ | Variables for the calculation of the starting temperature profile | $T_K$ | Crystalline melt temperature |
| $C$ | Machine constant | $T_M, \overline{T}, T$ | Mass temperature |
| $C_{x,z},C_{1,2,3}$ | Parameter for the calculation of the wall shear rate | $T_{M,0-5}$ | Mass temperature at the location 0–5 |
| $D$ | Inner barrel diameter | $T_S$ | Melt temperature |
| $D_F$ | Pressure screen value | $\overline{T_{Start}}$ | Average start temperature |
| $D_N$ | Nominal screw diameter | $T_Z$ | Barrel temperature |
| $D_S$ | Outer screw diameter | $T_{Z,1-5}$ | Barrel temperature at the location 1–5 |
| $E$ | Extensive material data | $U_{max}$ | Maximum wetted circumference ($s_R = 0$) |
| $F$ | Distribution function | $U_{min}$ | Minimum wetted circumference ($s_R = 0$) |
| $F$ | Factor | $\overline{U}$ | Average wetted circumference ($s_R = 0$) |
| $F$ | Screen area | $U(\Theta^*)$ | Wetted circumference dependent on $\Theta^*$ |
| $\Delta H$ | Difference of enthalpies | $\dot{V}$ | Volumetric flow rate |
| $K$ | Coefficient of the power law | $\dot{V}_{ei}$ | Volumetric flow rate in the intermeshing region |
| $K_{Spalt}$ | Coefficient of the power law in the clearance | $\dot{V}_{fr1,2}$ | Free volume |
| $K_{Kanal}$ | Coefficient of the power law in the channel | $\dot{V}_{Leck}$ | Volumetric leakage flow rate |
| $K_{0T}$ | Consistency | $\dot{V}_{Kanal}$ | Volumetric flow rate in the screw channel |
| $L$ | Axial length, screw length | $\dot{V}_p$ | Pressure flow |
| $L_{Ele}$ | Axial length of the pair of screw elements | $V_{real}$ | Realistic free volume |
| $L_{ei}$ | Axial length of the intermeshing region | $V_{theor}$ | Theoretical free volume |
| $L_{fr}$ | Axial length of the free channel section | $\dot{V}_S$ | Drag flow rate |
| $L_{Kn}$ | Overall axial length of the kneading blocks | $\dot{V}_{Steg}$ | Leakage flow rate |
| $L_R$ | Axial backpressure length | $\dot{V}_x$ | Volumetric flow rate in x-direction |
| $L_{Zw}$ | Axial length of the intermeshing area | $\dot{V}_z$ | Volumetric flow rate in z-direction |
| $M_{1,2}$ | Centerpoints | $V_{Zw}$ | Average volume of the intermeshing region |
| $M_D$ | Torque | $X$ | Concentration of the additive |
| $M_{D\%}$ | Proportional torque | $X$ | Width of the solid bed |
| $P$ | Power | $X$ | Ratio of element length and lead |
| $P_{1-3}$ | Power in the functional sections | $X_{1,2}$ | Width of the solid bed |
| $P_{1-4}, P_{M1-M4}$ | Points | $Y_1$ | Parameter of the pressure-throughput equation |
| $P_{Ma.,exp.}$ | Experimentally determined machine power | $Y_2$ | Parameter of the pressure-throughput equation |
| $P_{Ve.,ber.}$ | Calculated power of the processing unit | $Z$ | Degree of dispersion |
| $Z_{ei}$ | Unwound length of the intermeshing region | ||
| $Z_{fr}$ | Unwound length of the channel region | ||
| $Z,z$ | Cartesian coordinate (channel direction), length |