Numerical modeling of tunable optofluidics lens based on combined effect of hydrodynamics and electroosmosis

Haiwang Li, Teck Neng Wong, Nam Trung Nguyen, John C. Chai

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

A numerical model of liquid-core liquid-cladding optofluidics lens under the combined effect of hydrodynamics and electroosmosis are presented in this paper. In the numerical simulation, a combined formulation using only one set of conservation equations to treat both fluids are employed. The coupled electric potential equation and Navier-Stokes equation are solved using the finite volume method. The level-set method is used to capture the interface between the fluids. To overcome a weakness in the level-set method, the localized mass correction scheme is applied to ensure mass conservation. The validity of the numerical scheme is evaluated by comparing with the experimental results; numerical results highlight the electroosmotic effect; the combined effect of pressure driven and electroosmosis can form optically smooth interfaces with arc-shape between the cladding fluids and the core fluid. Under fixed cladding flow rates, the same electric field forms symmetric biconvex lens only. Different electric fields can form biconvex lens, plane-convex lens, and meniscus lens. The results also present the velocity profiles and flow fields of micro lens. There is a good agreement between numerical and experimental results.

Original languageEnglish
Pages (from-to)2647-2655
Number of pages9
JournalInternational Journal of Heat and Mass Transfer
Volume55
Issue number9-10
Early online date27 Jan 2012
DOIs
Publication statusPublished - Apr 2012
Externally publishedYes

Fingerprint

Electroosmosis
Lenses
Hydrodynamics
hydrodynamics
lenses
Fluids
fluids
Conservation
Electric fields
electric fields
conservation equations
menisci
finite volume method
Finite volume method
Liquids
liquids
Navier-Stokes equation
Navier Stokes equations
conservation
Numerical models

Cite this

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title = "Numerical modeling of tunable optofluidics lens based on combined effect of hydrodynamics and electroosmosis",
abstract = "A numerical model of liquid-core liquid-cladding optofluidics lens under the combined effect of hydrodynamics and electroosmosis are presented in this paper. In the numerical simulation, a combined formulation using only one set of conservation equations to treat both fluids are employed. The coupled electric potential equation and Navier-Stokes equation are solved using the finite volume method. The level-set method is used to capture the interface between the fluids. To overcome a weakness in the level-set method, the localized mass correction scheme is applied to ensure mass conservation. The validity of the numerical scheme is evaluated by comparing with the experimental results; numerical results highlight the electroosmotic effect; the combined effect of pressure driven and electroosmosis can form optically smooth interfaces with arc-shape between the cladding fluids and the core fluid. Under fixed cladding flow rates, the same electric field forms symmetric biconvex lens only. Different electric fields can form biconvex lens, plane-convex lens, and meniscus lens. The results also present the velocity profiles and flow fields of micro lens. There is a good agreement between numerical and experimental results.",
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Numerical modeling of tunable optofluidics lens based on combined effect of hydrodynamics and electroosmosis. / Li, Haiwang; Wong, Teck Neng; Nguyen, Nam Trung; Chai, John C.

In: International Journal of Heat and Mass Transfer, Vol. 55, No. 9-10, 04.2012, p. 2647-2655.

Research output: Contribution to journalArticle

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AB - A numerical model of liquid-core liquid-cladding optofluidics lens under the combined effect of hydrodynamics and electroosmosis are presented in this paper. In the numerical simulation, a combined formulation using only one set of conservation equations to treat both fluids are employed. The coupled electric potential equation and Navier-Stokes equation are solved using the finite volume method. The level-set method is used to capture the interface between the fluids. To overcome a weakness in the level-set method, the localized mass correction scheme is applied to ensure mass conservation. The validity of the numerical scheme is evaluated by comparing with the experimental results; numerical results highlight the electroosmotic effect; the combined effect of pressure driven and electroosmosis can form optically smooth interfaces with arc-shape between the cladding fluids and the core fluid. Under fixed cladding flow rates, the same electric field forms symmetric biconvex lens only. Different electric fields can form biconvex lens, plane-convex lens, and meniscus lens. The results also present the velocity profiles and flow fields of micro lens. There is a good agreement between numerical and experimental results.

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