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Research Papers

Ionic Wind Heat Transfer Enhancement in Vertical Rectangular Channels: Experimental Study and Model Validation

[+] Author and Article Information
Noris Gallandat

Mem. ASME
Department of Mechanical Engineering,
The George W. Woodruff School
of Mechanical Engineering,
Georgia Institute of Technology,
Atlanta, GA 30332

Federico Bonetto

School of Mathematics,
Georgia Institute of Technology,
Atlanta, GA 30332

J. Rhett Mayor

Mem. ASME
Department of Mechanical Engineering,
The George W. Woodruff School
of Mechanical Engineering,
Georgia Institute of Technology,
Atlanta, GA 30332
e-mail: rhett.mayor@me.gatech.edu

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received November 5, 2015; final manuscript received October 9, 2016; published online January 10, 2017. Assoc. Editor: Wei Li.

J. Thermal Sci. Eng. Appl 9(2), 021005 (Jan 10, 2017) (9 pages) Paper No: TSEA-15-1319; doi: 10.1115/1.4035291 History: Received November 05, 2015; Revised October 09, 2016

Abstract

This paper presents the results of an experimental study of ionic wind heat transfer enhancement in internal rectangular channels. Ionic wind is a potential technique to enhance natural convection cooling noise-free and without using moving part and thus ensuring a high reliability and a long lifetime. The goal of the present study is twofold: first, the multiphysics numerical model of ionic wind developed in previous work is validated experimentally. Second, the potential of the heat sink concept combining a fin array with an ionic wind generator is demonstrated by building a technology demonstrator. The heat sink presented in this work dissipates 240 W on a baseplate geometry of 200 × 263 mm. It is shown that the baseplate temperature can be reduced from 100 °C under natural convection to 81 °C when the ionic wind generator is turned on.

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Figures

Fig. 1

Sketch of the thermal test setup

Fig. 2

Moveable stand for the air velocity sensor allowing to collect data points across the channel

Fig. 3

Experimental setup for the thermal tests

Fig. 4

Key parameters of the ionic wind generator

Fig. 5

Comparison of the velocity measurement at the exit of the ionic wind generator with the model prediction for case #1

Fig. 6

Comparison of the velocity measurement at the exit of the ionic wind generator with the model prediction for case #2

Fig. 7

Comparison of the velocity measurement at the exit of the ionic wind generator with the model prediction for case #3

Fig. 8

Measurement sensitivity of the airflow sensor. Each data point is averaged over a minimum of ten samples.

Fig. 9

Velocity magnitude and vector field at a vertical electrode spacing of d1 = 15 mm and a channel width of d2 = 20 mm

Fig. 10

Transient wall temperatures for the six thermal tests

Fig. 11

Equivalent resistance network to compute the loss through the channel walls and insulation layers. Thereby, RPS stands for the thermal resistance of the polystyrene foam insulation.

Fig. 12

Comparison of the model prediction to the experimental data for two cooling channels of length 100 mm and 200 mm

Fig. 13

Heat sink design combining a fin array and an ionic wind generator

Fig. 14

Technology demonstrator of ionic wind heat transfer enhancement in conjunction with a fin array

Fig. 15

Transient temperature profile of the cold plate below each of the heaters. At t = 2 min, the heaters were turned on. At t = 78 min, the ionic wind generator was turned on, resulting in an immediate decrease of the cold plate temperature.

Fig. 16

Vertical body force induced by ionic wind at an electrode spacing of 15 mm and an applied voltage of 13.5 kV for different channels' widths (from top left to bottom right: 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, and 20 mm)

Fig. 17

Induced velocity profile depending on the channel width, all other parameters are kept constant

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