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TECHNICAL PAPERS

Modeling Electronic Cooling Axial Fan Flows

[+] Author and Article Information
R. Grimes, M. Davies, J. Punch, T. Dalton, R. Cole

PEI Technologies: Stokes Research Institute, Department of Mechanical and Aeronautical Engineering, University of Limerick, Limerick, Ireland

J. Electron. Packag 123(2), 112-119 (Oct 02, 2000) (8 pages) doi:10.1115/1.1339821 History: Received October 02, 2000
Copyright © 2001 by ASME
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References

Hennissen, J., Temmerman, W., Berghmans, J., and Allaert, K., 1997, “Modelling of Axial Fans for Electronic Equipment,” Proceedings of EUROTHERM Seminar 45, 20–22 September 1995, Leuven, Belgium, pp. 309–318.
Baellmans, M., Temmerman, W., Berghmans, J., Meyers, J., and Voorspools, K., 1997, “Fan Characterization for Electronic Equipment Cooling With Forced Convection,” Proceedings of Eurotherm Seminar 58, Sept. Nantes, France.
Nakamura,  H., and Komura,  T., 1996, “Flow Analysis for Electronic Equipment Cooling,” NEC Res. Dev., 37, No. 1, Jan, pp. 21–34.
BS 848: 1980, Fans for general purposes, Part 1: Methods for testing performance.
Cole,  R., Dalton,  T., Punch,  J., Davies,  M., and Grimes,  R., 2001, “Forced Convection Board Level Thermal Design Methodology,” ASME J. Electron. Packag., 123, published in this issue, pp. 120–126.
Goldstein, R. J., 1983, Fluid Mechanics Measurements, Hemisphere, pp. 331–341.
Bejan, A., 1995, Convection Heat Transfer, 2nd Ed., Wiley, New York, p. 269.
Schlichting, H., 1979, Boundary Layer Theory, 7th Ed., McGraw-Hill, London, p. 734.

Figures

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Fan performance test rig designed in accordance with BS 848
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Test enclosure containing Double Euro-Card PCB, on top of fan performance test rig
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(a) Computational model used to predict fan jets produced by a fan operating at 40 Pa. Flow is from bottom to top. (b) Computational model used to predict component local velocities with a fan sucking from the test enclosure.
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Standard performance of Papst TYP 4184 NGX fan as specified by the fan manufacturer (two curves) and as measured by the authors
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Papst TYP 4184 NGX fan performance curves when 1/2 blocked, 1/4 blocked and unblocked at the fan outlet
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Fan outlet swirl angle at varying radial distance from fan center, measured at three pressures within the recommended fan operating range and predicted for one pressure. Measurements were taken immediately downstream of the fan.
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Fan outlet radial angle at varying radial distance from fan center at three pressures within the recommended fan operating range and predicted radial angle at one pressure. Measurements were taken immediately downstream of the fan.
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(a) Jet produced by fan at a fan pressure of 15 Pa, (b) jet predicted at a fan pressure of 15 Pa
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(a) Jet produced by fan at a fan pressure of 27 Pa, (b) jet predicted at a fan pressure of 27 Pa
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(a) Jet produced by fan at a fan pressure of 40 Pa, (b) jet predicted at a fan pressure of 40 Pa
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Angle between paper tuft and fan axial direction measured 0.42 fan diameters axially downstream of the test fan. Measurements taken at three pressures within recommended operating range.
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Effect of a temperature increase of 60°C on Papst TYP 4184 NGX fan performance as predicted using standard nondimensional groups
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Smoke wire visualization of flow over PCB
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Measured and predicted values of component local velocity, 10 mm from component surface with fan sucking from system
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Measured and predicted values of component local velocity, 2.5 mm from component surface with fan sucking from system
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Measured and predicted values of component local velocity, 10 mm from component surface with fan blowing into system

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