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Research Papers

Numerical Simulation of Heat Transfer in Mixed Electroosmotic Pressure-Driven Flow in Straight Microchannels

[+] Author and Article Information
Amir Shamloo

Department of Mechanical Engineering,
Sharif University of Technology,
Tehran 11365-8639, Iran
e-mail: shamloo@sharif.edu

Arshia Merdasi

Department of Mechanical Engineering,
Sharif University of Technology,
Tehran 11365-8639, Iran
e-mail: arshia.merdasi@gmail.com

Parham Vatankhah

Department of Mechanical Engineering,
Sharif University of Technology,
Tehran 11365-8639, Iran
e-mail: parham_vatankhah@yahoo.com

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received July 20, 2015; final manuscript received October 16, 2015; published online December 8, 2015. Assoc. Editor: Ali J. Chamkha.

J. Thermal Sci. Eng. Appl 8(2), 021011 (Dec 08, 2015) (13 pages) Paper No: TSEA-15-1194; doi: 10.1115/1.4031933 History: Received July 20, 2015; Revised October 16, 2015

This paper investigates two-dimensional, time-independent elecroosmotic pressure-driven flow generated by a direct current electric potential with asymmetrical and symmetrical zeta potential distributions along the microchannel walls. Fluid flow through the horizontal microchannel is simulated using a numerical method. Two different cases are proposed to study the effect of electric potential on the flow field. First, negative electric potential is applied on the microchannel walls. In this case, large segments with negative electric potential are initially placed on the first half of the microchannel walls with two different arrangements. Afterward, smaller segments with negative electric potential are placed on the microchannel walls. Next, negative electric potential is replaced by positive electric potential on the microchannel walls in the similar manner. It is shown that applying positive potential on the walls contributes to the localized circular flows within the microchannel. The size of these vortices is also proved to considerably vary with the applied zeta potential magnitude. Finally, the effect of wall zeta potential on heat transfer was studied for all the four types of microchannels by imposing a constant uniform heat flux on the walls. The Nusselt number plots indicate how heat transfer varies along the microchannel walls. The Nusselt number fluctuation can be observed where the positive and negative electric potentials are located.

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Figures

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Fig. 1

Geometry of four types of microchannel with different distributions of zeta potential on the horizontal walls

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Fig. 2

Schematic illustration of Stern layer, diffuse layer, zeta potential, and characteristic length of double layer

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Fig. 3

Schematic view of EOF in a planar channel

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Fig. 4

Comparison of nondimensional velocity profile computed using the numerical method with three different meshes, 300 × 90, 400 × 120, 500 × 160 and the analytical method for Re = 20, ωh = 20 

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Fig. 5

Velocity contours, applying the negative electric potential, at Re = 20, ωh = 60

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Fig. 6

Velocity vectors, applying negative electric potential, at Re = 20, ωh = 60

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Fig. 7

Velocity contour for the condition of applying positive electric potential, at Re = 20, ωh = 60

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Fig. 8

Fluid velocity vectors when a positive electric potential is applied on the walls for Re = 20, ωh = 60 

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Fig. 9

Velocity contours for (a) ωh = 60, (b) ωh = 20 at the Re = 20

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Fig. 10

Temperature distribution applying a negative electric potential to the microchannel walls for Re = 20, ωh = 60

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Fig. 11

Temperature distribution applying a positive electric potential to the microchannel walls for Re = 20, ωh = 60 

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Fig. 12

Temperature profile over second half of the microchannel

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Fig. 13

Nusselt number along the microchannel at the lower wall for Re = 20, ωh = 60

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Fig. 14

Nusselt number along the microchannel at the upper wall for Re = 20, ωh = 60

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