0
TECHNICAL PAPERS

Air Flow and Heat Transfer in Fan Cooled Electronic Systems

[+] Author and Article Information
Ronan Grimes, Mark Davies

Stokes Research Institute, University of Limerick, Limerick, Ireland

J. Electron. Packag 126(1), 124-134 (Apr 30, 2004) (11 pages) doi:10.1115/1.1649241 History: Received October 01, 2003; Online April 30, 2004
Copyright © 2004 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Fan performance test rig designed in accordance with BS 848, with the test electronic system attached so that the test fan blows into it. Dimensions are in mm.
Grahic Jump Location
Test enclosure containing populated Printed Circuit Board, attached to the fan performance test rig. The fan can be placed at either end of the enclosure to give sucking and blowing flows. Dimensions are in mm. The mean flow direction is from left to right.
Grahic Jump Location
Aluminum block with thin film heater and insulating spacer. Dimensions in mm.
Grahic Jump Location
PIV measurement planes for sucking case represented by sections AA and BB. These measurement planes were divided into measurement regions. Measurement regions in the plane indicated by AA are denoted A1 to A4 while measurement regions in the plane indicated by BB are denoted B1 and B2.
Grahic Jump Location
PIV measurement planes for blowing case represented by sections CC to II. These measurement planes were divided into measurement regions, which are numbered in the same manner as those in Fig. 4.
Grahic Jump Location
(a) Calibrated infrared thermal image of PCB with fan sucking from system (b) distribution of component average and maximum temperatures and Nusselt number, with fan sucking from system.
Grahic Jump Location
PIV measurement of air sucked through the system. The measurement was taken in the plane indicated by section AA in Fig. 4.
Grahic Jump Location
PIV measurement of air sucked through the system. The measurement was taken in the plane indicated by section BB in Fig. 4.
Grahic Jump Location
(a) Smoke visualization of undisturbed jet produced by fan operating at highest flow within recommended operating range (b) Streamlines in an undisturbed fan jet. The green streamlines emerge from blade root region and the black streamlines emerge from blade tip region.
Grahic Jump Location
Interaction of fan jet streamlines with system geometry: (a) Viewed from component side of PCB (b) Viewed from noncomponent side of PCB (note: enclosure is oriented upside down to maintain left to right flow direction) (c) Viewed from downstream end of system.
Grahic Jump Location
(a) Calibrated infrared thermal image of PCB with fan blowing into system (b) distribution of component average and maximum temperatures, and Nusselt number based on component average temperature, with fan blowing into system. (Component numbers are at the top left corner of each component.)
Grahic Jump Location
PIV measurement of air blown through the system. The measurement was taken in the plane indicated by section CC in Fig. 1. This plane is parallel to the PCB, 12 mm from the PCB component side.
Grahic Jump Location
PIV measurement of air blown through the system. The measurement was taken in the plane indicated by section HH in Fig. 1. This plane is parallel to the enclosure base, 20 mm from the enclosure base, which is half way between enclosure base and the bottom row of components.
Grahic Jump Location
PIV measurement of air blown through the system. The measurement was taken in the plane indicated by section II in Fig. 1. This plane is parallel to the enclosure base and in line with the center line of component 1,1.
Grahic Jump Location
PIV measurements of air blown through the system. The measurements were taken in the planes indicated by sections DD to GG in Fig. 1.

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In