Slip flow through a converging microchannel: experiments and 3D simulations

Varade, Vijay ; Agrawal, Amit ; Pradeep, A M (2015) Slip flow through a converging microchannel: experiments and 3D simulations Journal of Micromechanics and Microengineering, 25 (2). 025015. ISSN 0960-1317

Full text not available from this repository.

Official URL:

Related URL:


An experimental and 3D numerical study of gaseous slip flow through a converging microchannel is presented in this paper. The measurements reported are with nitrogen gas flowing through the microchannel with convergence angles (4°, 8° and 12°), hydraulic diameters (118, 147 and 177 µm) and lengths (10, 20 and 30 mm). The measurements cover the entire slip flow regime and a part of the continuum and transition regimes (the Knudsen number is between 0.0004 and 0.14); the flow is laminar (the Reynolds number is between 0.5 and 1015). The static pressure drop is measured for various mass flow rates. The overall pressure drop increases with a decrease in the convergence angle and has a relatively large contribution of the viscous component. The numerical solutions of the Navier–Stokes equations with Maxwell's slip boundary condition explore two different flow behaviors: uniform centerline velocity with linear pressure variation in the initial and the middle part of the microchannel and flow acceleration with nonlinear pressure variation in the last part of the microchannel. The centerline velocity and the wall shear stress increase with a decrease in the convergence angle. The concept of a characteristic length scale for a converging microchannel is also explored. The location of the characteristic length is a function of the Knudsen number and approaches the microchannel outlet with rarefaction. These results on gaseous slip flow through converging microchannels are observed to be considerably different than continuum flow.

Item Type:Article
Source:Copyright of this article belongs to IOP Publishing.
ID Code:114966
Deposited On:17 Mar 2021 05:36
Last Modified:17 Mar 2021 05:36

Repository Staff Only: item control page