Numerical investigation of multistage viscous micropump configurations

M. Abdelgawad, Ibrahim Hassan, N. Esmail, P. Phutthavong

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The viscous micropump consists of a cylinder placed eccentrically inside a microchannel, where the rotor axis is perpendicular to the channel axis. When the cylinder rotates, a net force is transferred to the fluid because 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 toward the microchannel outlet. The simplicity of the viscous micropump renders it ideal for micropumping; however, previous studies have shown that its performance is still less than what is required for various applications. The performance of the viscous micropump, in terms of flow rate and pressure capabilities, may be enhanced by implementing more than one rotor into the configuration either horizontally or vertically oriented relative to each other. This is analogous to connecting multiple pumps in parallel or in series. The present study will numerically investigate the performance of various configurations of the viscous micropumps with multiple rotors, namely, the dual-horizontal rotor, triple-horizontal rotor, symmetrical dual-vertical rotor, and eight-shaped dual-vertical rotor. The development of drag-and-lift forces with time, as well as the viscous resisting torque on the cylinders were studied. In addition, the corresponding drag, lift, and moment coefficients were calculated. The flow pattern and pressure distribution on the cylinders' surfaces are also included in the study. Results show that the symmetrical dual-vertical rotor configuration yields the best efficiency and generates the highest flow rate. The steady-state performance of the single-stage micropump was compared to the available experimental and numerical data and found to be in very good agreement. This work provides a foundation for future research on the subject of fluid phenomena in viscous micropumps.

Original languageEnglish
Pages (from-to)734-742
Number of pages9
JournalJournal of Fluids Engineering, Transactions of the ASME
Volume127
Issue number4
DOIs
Publication statusPublished - Jul 2005
Externally publishedYes

Fingerprint

Rotors
Microchannels
Fluids
Drag
Flow rate
Pressure distribution
Flow patterns
Shear stress
Torque
Pumps

Keywords

  • CFD Simulation
  • MEMS
  • Multiple Rotor
  • Viscous Micropump

ASJC Scopus subject areas

  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

Cite this

Numerical investigation of multistage viscous micropump configurations. / Abdelgawad, M.; Hassan, Ibrahim; Esmail, N.; Phutthavong, P.

In: Journal of Fluids Engineering, Transactions of the ASME, Vol. 127, No. 4, 07.2005, p. 734-742.

Research output: Contribution to journalArticle

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