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Research Papers

Hydrodynamics and Heat Transfer Characteristics of a Miniature Plate Pin-Fin Heat Sink Utilizing Al2O3–Water and TiO2–Water Nanofluids

[+] Author and Article Information
Majid Roshani

Center of Excellence in Design
and Optimization of Energy Systems (CEDOES),
School of Mechanical Engineering,
College of Engineering,
University of Tehran,
Tehran 11155-4563, Iran
e-mail: m_rowshani90@ut.ac.ir

Seyed Ziaeddin Miry

Center of Excellence in Design
and Optimization of Energy Systems (CEDOES),
School of Mechanical Engineering,
College of Engineering,
University of Tehran,
Tehran 11155-4563, Iran
e-mail: z.miry@ut.ac.ir

Pedram Hanafizadeh

Assistant Professor
Center of Excellence in Design
and Optimization of Energy Systems (CEDOES),
School of Mechanical Engineering,
College of Engineering,
University of Tehran,
P.O. Box: 11155-4563,
Tehran 11155-4563, Iran
e-mail: hanafizadeh@ut.ac.ir

Mehdi Ashjaee

Professor
Center of Excellence in Design
and Optimization of Energy Systems (CEDOES),
School of Mechanical Engineering,
College of Engineering,
University of Tehran,
P.O. Box: 11155-4563,
Tehran 11155-4563, Iran
e-mail: ashjaee@ut.ac.ir

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received September 14, 2014; final manuscript received February 26, 2015; published online April 15, 2015. Assoc. Editor: Zahid Ayub.

J. Thermal Sci. Eng. Appl 7(3), 031007 (Sep 01, 2015) (12 pages) Paper No: TSEA-14-1213; doi: 10.1115/1.4030103 History: Received September 14, 2014; Revised February 26, 2015; Online April 15, 2015

In this paper, the hydrodynamic and thermal performance of a miniature plate pin-finned heat sink is investigated experimentally by utilizing two widely used nanofluids, Al2O3–water and TiO2–water. The heat sink base plate, which is used in the cooling process of electronic devices, has the dimensions of 42 mm (L) × 42 mm (W) × 14 mm (H) and is made of aluminum and placed in a plexiglass case which is isolated from the environment using an insulator foam. The thermal performance of the heat sink is investigated by passing the nanofluid at constant inlet temperature while applying a constant heat flux of 124.8 kW/m2 to the bottom surface of the heat sink. The nanofluids are prepared in volume concentrations of 0.5, 1, 1.5, and 2% and their performances are measured considering water as the base fluid. Measuring the pressure difference between the entrance and exit of the heat sink made it possible to study the hydrodynamic performance of the heat sink. Although the measurements showed 15% and 30% increase in the pumping power for the volume concentration of 2% of Al2O3–water and TiO2–water nanofluids, respectively, the average heat transfer coefficients increased by 16% and 14% and the thermal resistance decreased by 17% and 14% for each nanofluid.

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Figures

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Fig. 1

Schematic of the experimental setup

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Fig. 2

Schematic of the test section

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Fig. 3

Geometric configuration of the miniature PPFHS

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Fig. 4

Real photo of the embedded heat sink in the plexiglass case

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Fig. 5

Geometric configuration of heater block

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Fig. 6

The influence of Reynolds number and volume concentration of nanofluids on the temperature of the bottom of the heat sink: (a) Al2O3–water and (b) TiO2–water nanofluids

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Fig. 7

The influence of volume fraction and Reynolds number on average convective heat transfer coefficient: (a) Al2O3–water nanofluids and (b) TiO2–water nanofluids

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Fig. 8

Convective average heat transfer coefficient versus Reynolds number for Al2O3–water and TiO2–water nanofluids

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Fig. 9

The effect of the volume fraction and Reynolds number on the thermal resistance: (a) Al2O3–water nanofluids and (b) TiO2–water nanofluids

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Fig. 10

Thermal resistance versus Reynolds number for Al2O3–water and TiO2–water nanofluids

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Fig. 11

The influence of Reynolds number and volume fraction on Nusselt number: (a) Al2O3–water nanofluids and (b) TiO2–water nanofluids

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Fig. 12

Predicted Nusselt number versus experimental Nusselt number for: (a) Al2O3–water and (b) TiO2–water nanofluids

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Fig. 13

The effect of Reynolds number and volume fraction on pumping power: (a) Al2O3–water nanofluids and (b) TiO2–water nanofluids

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Fig. 14

Pumping power versus Reynolds number for Al2O3–water and TiO2–water nanofluids

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