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Research Papers

An Experimental Investigation of Wavy and Straight Minichannel Heat Sinks Using Water and Nanofluids

[+] Author and Article Information
A. Dominic

Department of Mechanical Engineering,
National Institute of Technology,
Tiruchirappalli 620015, India
e-mail: dominicthiru@gmail.com

J. Sarangan

Professor
Department of Mechanical Engineering,
National Institute of Technology,
Tiruchirappalli 620015, India
e-mail: jsarangan@nitt.edu

S. Suresh

Assistant Professor
Department of Mechanical Engineering,
National Institute of Technology,
Tiruchirappalli 620015, India
e-mail: ssuresh@nitt.edu

V. S. Devah Dhanush

Department of Mechanical Engineering,
National Institute of Technology,
Tiruchirappalli 620015, India
e-mail: devahdhanush@hotmail.com

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received September 24, 2014; final manuscript received March 13, 2015; published online May 12, 2015. Assoc. Editor: Zahid Ayub.

J. Thermal Sci. Eng. Appl 7(3), 031012 (Sep 01, 2015) (9 pages) Paper No: TSEA-14-1223; doi: 10.1115/1.4030104 History: Received September 24, 2014; Revised March 13, 2015; Online May 12, 2015

An experimental investigation on the heat transfer performance and pressure drop characteristics of thermally developing and hydrodynamically developed laminar flow of de-ionized (DI) water and 0.1%, 0.5%, and 0.8% concentrations of Al2O3/water nanofluid in wavy and straight minichannels was conducted. Reynolds number was varied from 700 to 1900 and two different heat fluxes of 45 kW/m2 and 65 kW/m2 were applied. The performance factor (PF) of water in wavy minichannels over their straight counterparts was higher than the nanofluids. Temperature distributions and general correlations of these minichannels are also presented.

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References

Figures

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Fig. 4

Schematic diagram of: (a) straight and (b) wavy minichannels

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Fig. 3

Photographic view of the wavy minichannel assembly

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Fig. 2

(a) Schematic diagram and (b) photographic view of the experimental setup

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Fig. 1

SEM image of Al2O3 nanoparticles used in the study

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Fig. 5

Validation of experimental setup by Nusselt number as a function of Reynolds number

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Fig. 6

Validation of experimental setup by friction factor as a function of Reynolds number

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Fig. 7

Heat transfer performance of wavy and straight minichannels with respect to Reynolds number at 45 kW/m2

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Fig. 8

Heat transfer performance of wavy and straight minichannels with respect to Reynolds number at 65 kW/m2

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Fig. 9

Wall temperature distribution with respect to axial distance of wavy and straight minichannel for: (a) DI water, (b) 0.1% Al2O3/water, (c) 0.5% Al2O3/water, and (d) 0.8% Al2O3/water nanofluids at 45 kW/m2

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Fig. 10

Pressure drop of wavy and straight minichannels as a function of Reynolds Number

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Fig. 11

Friction factor as a function of Reynolds number

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Fig. 12

PF as a function of Reynolds number at 45 kW/m2

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