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An investigation into flow and heat transfer of an ultrasonic micro-blower device for electronics cooling applications

Title	An investigation into flow and heat transfer of an ultrasonic micro-blower device for electronics cooling applications
Author	Ghaffari, Omidreza, Solovitz, S. A., Ikhlaq, Muhammad, Arık, Mehmet
Publication Date:	2016-05-08
Publication Place	- Elsevier
Subject	Ultrasonic blower, Impingement, Electronics cooling, Particle image velocimetry, Synthetic jet, Thermal management
Type	Periodical
Language	English
Digital	Yes
Manuscript	No
Library:	Özyeğin University
Library Asset ID	1359-4311
Record ID	02159b05-76c9-4ff6-9eb9-7e52abcdf22d
Library Location	Mechanical Engineering
Date	2016-05-08
Notes	Due to copyright restrictions, the access to the full text of this article is only available via subscription.
Sample Text	As compact electronics increase in functionality, new electronics cooling approaches must be more effective, and they must be lower in form factor. In this paper, we investigated the cooling performance of a miniature ultrasonic micro-blower impinging upon a vertical heater. We studied the temperature response at different operating conditions, determining the optimal thermal conditions. We further examined the local flow field using the particle image velocimetry (PIV) technique at the same operating conditions, providing explanations for the heat transfer response in terms of the fluid dynamics. Heat transfer measurements show that the maximum cooling performance occurs at a jet-to-surface spacing ratio of 15 < H/D < 30, and the performance slowly decays when the jet is located further away. The preferred operating frequency of the piezoelectric cooling device occurs at an ultrasonic frequency of over 20 kHz, meaning that this device can function outside the human hearing range. The PIV results demonstrate that the jet profile in the near field deviates significantly from a traditional turbulent free jet. In the far field, it nearly matches the self-similar, fully-developed jet profile. The jet cooling performance is sensitive to the frequency, with the thermal performance dropping by a factor of six when varying by less than 1 kHz from the peak. At the optimal heat transfer condition, the coefficient of performance is measured at approximately three, which is lower than that of some synthetic jets.
DOI	10.1016/j.applthermaleng.2016.06.094
Cilt	106

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An investigation into flow and heat transfer of an ultrasonic micro-blower device for electronics cooling applications

Author Ghaffari, Omidreza, Solovitz, S. A., Ikhlaq, Muhammad, Arık, Mehmet

Publication Date 2016-05-08

Publication Place - Elsevier

Subject Ultrasonic blower, Impingement, Electronics cooling, Particle image velocimetry, Synthetic jet, Thermal management

Type Periodical

Language English

Digital Yes

Manuscript No

Library Özyeğin University

Library Asset ID 1359-4311

Record ID 02159b05-76c9-4ff6-9eb9-7e52abcdf22d

Library Location Mechanical Engineering

Date 2016-05-08

Notes Due to copyright restrictions, the access to the full text of this article is only available via subscription.

Sample Text As compact electronics increase in functionality, new electronics cooling approaches must be more effective, and they must be lower in form factor. In this paper, we investigated the cooling performance of a miniature ultrasonic micro-blower impinging upon a vertical heater. We studied the temperature response at different operating conditions, determining the optimal thermal conditions. We further examined the local flow field using the particle image velocimetry (PIV) technique at the same operating conditions, providing explanations for the heat transfer response in terms of the fluid dynamics. Heat transfer measurements show that the maximum cooling performance occurs at a jet-to-surface spacing ratio of 15 < H/D < 30, and the performance slowly decays when the jet is located further away. The preferred operating frequency of the piezoelectric cooling device occurs at an ultrasonic frequency of over 20 kHz, meaning that this device can function outside the human hearing range. The PIV results demonstrate that the jet profile in the near field deviates significantly from a traditional turbulent free jet. In the far field, it nearly matches the self-similar, fully-developed jet profile. The jet cooling performance is sensitive to the frequency, with the thermal performance dropping by a factor of six when varying by less than 1 kHz from the peak. At the optimal heat transfer condition, the coefficient of performance is measured at approximately three, which is lower than that of some synthetic jets.

DOI 10.1016/j.applthermaleng.2016.06.094

Cilt 106