Numerical modeling of non-Newtonian flow in viscous micropump

Haifa El-Sadi, Nabil Esmail, Ibrahim Hassan

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Non-Newtonian fluid can be encountered in many applications of Microdevices. In this study, two-dimensional non-Newtonian simulations of viscous micropump were performed. The viscous micropump consists of a rotating cylinder located eccentrically inside a microchannel. When the cylinder rotates, a net force is transferred to the fluid due to the unequal shear stresses on the upper and lower surfaces of the cylinder, thus causing the fluid to displace. Navier Stokes equations and modified Bingham model have been used to describe the fluid flow. Parameters as viscosity and stress used in the model are based on experimental data. It was found that Reynolds number is a predominant parameter on the variation of bulk velocity as a function of eccentricity. The stress and bulk velocity decrease with increasing the eccentricity at low Reynolds number. The changes in non-Newtonian fluid structure are related to Reynolds number, eccentricity and channel height. The pumping performance of non-Newtonian fluid is increasing with global pressure gradient and decreasing with the channel height.

Original languageEnglish
Pages (from-to)51-58
Number of pages8
JournalNihon Reoroji Gakkaishi
Volume36
Issue number1
DOIs
Publication statusPublished - 2008
Externally publishedYes

Fingerprint

Non Newtonian flow
eccentricity
Fluids
fluids
Reynolds number
rotating cylinders
low Reynolds number
microchannels
Microchannels
Pressure gradient
pressure gradients
Navier-Stokes equation
Navier Stokes equations
shear stress
fluid flow
Shear stress
Flow of fluids
pumping
Viscosity
viscosity

Keywords

  • Bingham model
  • Bulk velocity
  • Eccentricity
  • Micropump
  • Non-newtonian

ASJC Scopus subject areas

  • Polymers and Plastics

Cite this

Numerical modeling of non-Newtonian flow in viscous micropump. / El-Sadi, Haifa; Esmail, Nabil; Hassan, Ibrahim.

In: Nihon Reoroji Gakkaishi, Vol. 36, No. 1, 2008, p. 51-58.

Research output: Contribution to journalArticle

El-Sadi, Haifa ; Esmail, Nabil ; Hassan, Ibrahim. / Numerical modeling of non-Newtonian flow in viscous micropump. In: Nihon Reoroji Gakkaishi. 2008 ; Vol. 36, No. 1. pp. 51-58.
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