Flow characterization in converging-diverging microchannels

Ran Tao, Yakang Jin, Xiang Gao, Zhigang Li*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Experiments are conducted to investigate fluid flows in converging-diverging microchannels (CDMCs). A new dimensionless number related to channel geometry, Gm, is introduced to combine with the Reynolds number, Re, to characterize the flows. It is found that the new dimensionless number, ReG = Re · Gm, is more appropriate than Re for flow characterization in CDMCs. Flows are laminar for ReG < 40 regardless of the geometry of CDMCs. For laminar flows, the flow resistance model developed in the literature works well. For transitional and turbulent flows, a general scaling law for the flow resistance is developed, which suggests a polynomial dependence of pressure drop on the flow rate. Numerical simulations have also been performed to confirm experimental results.

Original languageEnglish
Article number112004
JournalPhysics of Fluids
Issue number11
StatePublished - 1 Nov 2018
Externally publishedYes


Dive into the research topics of 'Flow characterization in converging-diverging microchannels'. Together they form a unique fingerprint.

Cite this