Global prediction accuracies of knowledge-guided symbolic regression models for melt conveying in single-screw extruders

Excel spreadsheet with numeric values and textual description.Contains the mean absolute errors (MAE) and coefficients of determination (R²) of symbolic regression models for the dimensionless melt flow rate in single-screw extruders with different cases of integrated domain knowledge:

Case 1: theory of similarity only,

Case 2: additional derived input features for pure pressure flow,

Case 3: logarithmic scaling of the dimensionless flow rate with channel aspect ratio as derived input feature,

Case 4: theoretical approximation equation for superimposed drag and pressure flow in dimensionless space,

evaluated on numerically simulated design points in the interpolation and extrapolation range, respectively.