Knudsen number – TechConnect Briefs

Efficient 3-D Numerical Code “FastSlipStokes” for Drag Force Calculation Due to Slip Flow

Ding J., Ye W., Georgia Institute of Technology, US

Drag force calculation due to slip flows is important in predicting the performance of the microstructures with minimum feature size around 1 mm. In this paper, an efficient numerical approach to compute the drag force [...]

End Effects of Rare Gas Flow in Short Channels and in Squeezed-Film Dampers

Veijola T., Helsinki University of Technology, FI

Simple approximate design formulas (+-5%) for calculating the elongation of the idealized viscous flow channel of rare gas at Knudsen numbers Kn < 100 due to the open end effects. Rectangular channels with a large [...]

Compact Damping Models for Lateral Structures Including Gas Rarefaction Effects

Veijola T., Helsinki University of Technology, FI

Compact models for the viscous damping coefficient in narrow air gaps between laterally moving structures are reported. The gas rarefaction effects are included in these small-displacement models. In the first part of the paper, a [...]