Research Paper

Microfluidics and Nanofluidics

, Volume 1, Issue 2, pp 190-196

First online:

A criterion for experimental validation of slip-flow models for incompressible rarefied gases through microchannels

  • Gian Luca MoriniAffiliated withDIENCA, Università di Bologna Email author 
  • , Marco LorenziniAffiliated withDIENCA, Università di Bologna
  • , Marco SpigaAffiliated withDipartimento di Ingegneria Industriale

Rent the article at a discount

Rent now

* Final gross prices may vary according to local VAT.

Get Access


This paper is devoted to analysing the friction factor for incompressible rarefied gas flow through microchannels. A theoretical investigation is conducted in order to underline the conditions for experimentally evidencing rarefaction effects on the pressure drop. It is demonstrated that for a fixed geometry of the microchannel cross-section, it is possible to calculate the minimum value of the Knudsen number for which the rarefaction effects can be observed experimentally, taking into account the uncertainties related to evaluation of the friction factor.


Microchannels Rarefied gas Slip-flow Pressure drop Experimental uncertainty