An approximate analytical solution is obtained for the flow rate‐pressure drop relation for adiabatic capillary flow of a fluid with a pressure‐ and temperature‐dependent viscosity. Neglect of the pressure dependence can result in large errors in the usual range of injection molding practice. The approximate solution follows from an exact solution of capillary flow with a viscosity that depends only on pressure.
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Morton M. Denn (1981) studied this question.