Author
Ghaffari, Omidreza, Solovitz, S. A., Arık, Mehmet
Publication Date
2016-09
Publication Place
-
Elsevier
Subject
Synthetic jet, Impingement, Electronics cooling, Particle image velocimetry, Phase-locked transient flow
Type
Periodical
Language
English
Digital
Yes
Manuscript
No
Library
Özyeğin University
Library Asset ID
0017-9310
Record ID
336b7b7e-44d5-4bb6-b463-c557820f93aa
Library Location
Mechanical Engineering
Date
2016-09
Notes
Due to copyright restrictions, the access to the full text of this article is only available via subscription.
Sample Text
According to the latest trends in miniature consumer and military electronics, there is a need for compact cooling solutions to meet performance requirements at compact volumes. Successful technology must feature a thin profile and a small footprint area, while still removing a significant amount of heat dissipation. Impinging synthetic jets driven by a piezoelectric membrane are a promising method for cooling small-scale electronics. In this paper, we explore the thermal response of a miniature synthetic jet impinging upon a vertical heater. In addition, we study the local flow field using the particle image velocimetry (PIV) technique to couple heat transfer with fluid dynamics. Heat transfer results show that the maximum cooling performance occurs with a jet-to-surface spacing of 5 ⩽ H/Dh ⩽ 10, which is associated with the flow consisting of coherent vortex structures. There is a degradation of heat transfer for closer jet-to-surface spacings, such as H/Dh = 2. This was due to the incomplete growth of the vortices, along with re-entrainment of warm air from the impinging plate back into the jet flow. There was also some warm air sucked back into the jet during the suction phase of the synthetic jet. For a fixed value of Reynolds number, cooling was improved at high Stokes numbers, but with a reduced coefficient of performance.
DOI
10.1016/j.ijheatmasstransfer.2016.04.115
Cilt
100
