Flow of Saliva in a Lab-on-a-chip under Electrokinetic Body Force

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Zandi, Mohammad | 2014

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 45743 (08)
University: Sharif University of Technology
Department: Mechanical Engineering
Advisor(s): Saeedi, Mohammad Hassan
Abstract:
The lab-on-a-chip (LOC) devices utilizing electroosmosis for flow actuation are usually encountered with non-Newtonian behavior of working fluids. Hence, studying the flow of non-Newtonian fluids under an electroosmotic body force is of high importance for accurate design and active control of these devices. In this thesis, mixed electroosmotically and pressure driven flow of salivathrough a rectangular microchannel is examined utilizing two viscoelastic constitutive equations, namely PTT and FENE-P models. Since the hydrodynamic entry length is usually negligible for microflows, a hydrodynamically developed flow is considered in the analysis. The governing equations in dimensionless form are numerically solved through a finite difference procedure for a non-uniform grid. It is observed that the dependency of the mean velocity on the level of elasticity in the fluid is linear. This functionality results in a Poiseuille number independent of the level of elasticity in the fluid. Moreover, increasing the Debye-Hückel parameter and the zeta potential leads to higher amounts of the dimensionless mean velocity and the Poiseuille number
Keywords:
Electroosmotic Flow ; Lab-on-a-Chip ; Viscoelastic Fluids ; Microfluidic System

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