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Research Papers

Numerical Analysis of Fluid Flow and Heat Transfer of Flow Between Parallel Plates Having Rectangular Shape Micromixer

[+] Author and Article Information
Sudip Shyam

Department of Mechanical Engineering,
NIT Agartala,
Agartala 799046, India
e-mail: sudipme2012@gmail.com

Aparesh Datta

Department of Mechanical Engineering,
NIT Agartala,
Agartala 799046, India
e-mail: adatta96@gmail.com

Ajoy Kumar Das

Department of Mechanical Engineering,
NIT Agartala,
Agartala 799046, India
e-mail: akdas_72@yahoo.com

1Corresponding authors.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received September 9, 2016; final manuscript received January 24, 2017; published online June 27, 2017. Assoc. Editor: Qingang Xiong.

J. Thermal Sci. Eng. Appl 10(1), 011003 (Jun 27, 2017) (8 pages) Paper No: TSEA-16-1259; doi: 10.1115/1.4036769 History: Received September 09, 2016; Revised January 24, 2017

In this study, heat transfer and fluid flow of de-ionized water in two-dimensional parallel plates microchannel with and without micromixers have been investigated for various Reynolds numbers. The effects of heat transfer and fluid flow on height, diameter of micromixer, and also distance between the two micromixers are carried out in the study. Results showed that the diameter of the micromixer does not have much effect on heat transfer with a maximum enhancement of 9.5%. Whereas heat transfer gets enhanced by 85.57% when the height of the micromixer is increased from 100 μm to 400 μm, and also heat transfer gets improved by 11.45% when sb2 is increased from 4L to 5L. The separation and reattachment zone at the entry and exit of the micromixer cause the increase in heat transfer with the penalty of pressure drop. It is also found that increase of Reynolds number increases the intensity of the secondary flows leads to rapid increase in heat transfer and pressure drop. Finally, the optimized structure of micromixer is found out based on maximum heat transfer and minimum pressure drop.

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Figures

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Fig. 1

Geometric configuration of the model

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Fig. 2

Fully developed velocity distribution in microchannel without baffle; Re = 100, where Y = y/H

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Fig. 3

Validation of Nu number variation in streamwise direction, Renf = 6.9, and ϕ = 5%

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Fig. 4

Local Nu for various micromixer heights, for sb1 = 2 H and Re 100

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Fig. 5

Streamline distribution for sb1 = 2 H, Re 100, and d = 400 μm: (a) h = 0.8 H, (b) h = 0.6 H, (c) h = 0.4 H, and (d) h = 0.2 H

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Fig. 6

Local Nu for various micromixer diameters, for sb1 = 2 H and Re 100

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Fig. 7

Streamline distribution for h = 0.8 H, sb1 = 2 H, and Re 100: (a) d = 400 μm, (b) d = 300 μm, (c) d = 200 μm, and (d) d = 100 μm

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Fig. 8

Local Nu for various distances between micromixer for (a) RE 10, (b) 50, and (c) 100

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Fig. 9

Local pressure drop for various distances between micromixer for (a) RE 10, (b) 50, and (c) 100

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Fig. 10

Streamline distribution for h = 0.8H, sb1 = 2H, and Re 100 for various distances between micromixer: (a) 4H, (b) 5H, (c) 6H, and (d) 7H

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