Development of a novel microviscosity model based on molecular chain length

A novel microscale viscosity model was developed on the basis of molecular chain length (MCL). This MCL-viscosity model was validated by comparing the experimental filling ratio of 80- and 70-μm-thick sheets with the simulated filling ratio. In addition, the experimental pressure drops for 200- and 300-μm-long square columns were compared with the simulated pressure drops. The results showed that when the feature size decreased, the simulated filling ratio obtained using the MCL-viscosity model was much closer to experimental data than the macroscopic model. In addition, the simulated pressure drop by the MCL-viscosity model was closer to the experimental data than by the macroscopic model when the shear rate increased. The analysis of the impact of microviscosity on the micro flow process showed that, when the feature size decreased, the deviations in viscosity, injection pressure, and velocity values between the MCL-viscosity and macroviscosity models increased.