Injection Molding Runner & Sprue Pressure Drop Calculator

Model non-Newtonian polymer pressure drop through cold runner channels, wall shear rate, fill time, and viscous frictional dissipation per Moldflow standards.

Runner Geometry & Channel Profile

Runner Diameter / Hydraulic D (mm or in):

Channel Cross-Section Shape:

Total Flow Length L (mm):

Volumetric Melt Flow Rate Q (cm³/s):

Polymer Melt Rheology (Power Law)

Consistency Index m (Pa·s^n):

Power Law Exponent n: Shear thinning index

Pressure Drop & Shear Heating

Runner Pressure Loss (ΔP):

—

— psi

Wall Shear Rate (γ_dot):

—

Adiabatic Shear Temperature Rise:

—

Average Linear Flow Velocity:

—

Hydraulic Efficiency Assessment:

—

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Injection Molding Runner & Sprue Pressure Drop Calculator

Runner Geometry & Channel Profile

Polymer Melt Rheology (Power Law)

Pressure Drop & Shear Heating

Frequently Asked Questions