Transient performance of flow over a rotating object placed eccentrically inside a microchannel - Numerical study

P. Phutthavong, Ibrahim Hassan

Research output: Contribution to journalArticle

14 Citations (Scopus)


Industrial applications today are demanding the implementation of microelectromechanical systems (MEMS) into their products. These are mechanical devices that are able to perform work, and yet have characteristic lengths less than 1-mm. As a result, the Reynolds number is typically low, which indicates the dominance of viscous forces. When a cylinder is placed eccentrically inside a microchannel, where the rotor axis is perpendicular to the channel axis, a net force is transferred to the fluid as a result of the unequal shear stresses on the upper and lower surfaces of the rotor. Consequently, this causes the surrounding fluid in the channel to displace towards the microchannel outlet. The present numerical investigation is a comparative study of transient flow behavior in a microchannel with rotating cylinders with different cross-sectional geometries. The effects of channel height, eccentricity, Reynolds number, and pump load were studied, as well as the development of their respective streamlines and pressure contours. The steady state results were compared with existing numerical and experimental results, and the comparisons showed very good agreement.

Original languageEnglish
Pages (from-to)71-85
Number of pages15
JournalMicrofluidics and Nanofluidics
Issue number1
Publication statusPublished - Nov 2004
Externally publishedYes



  • Rectangle cylinder flow
  • Square cylinder flow
  • Transient microfluidics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Materials Chemistry

Cite this