(a) Outlet effect
(b) Inlet effect
Figure 4: The effective resistance enhancement by the end effects changing with the dimensionless length of microchannels, where denotes the effective resistance of the truncated channel at length and the effective resistance of the reference channel at the corresponding region. The symbols are results from our DSMC simulations, and the dash lines are the fitting curves at a function of with . For the outlet effect, , while, for the inlet effect, .