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TECHNICAL PAPERS

On the Use of Point Source Solutions for Forced Air Cooling of Electronic Components—Part I: Thermal Wake Models for Rectangular Heat Sources

[+] Author and Article Information
Alfonso Ortega

Department of Aerospace and Mechanical Engineering, The University of Arizona, Tucson, AZ 85721

Shankar Ramanathan

Center for Electronic Packaging Research, The University of Arizona, Tucson, AZ 85721

J. Electron. Packag 125(2), 226-234 (Jun 10, 2003) (9 pages) doi:10.1115/1.1569506 History: Received March 26, 2002; Online June 10, 2003
Copyright © 2003 by ASME
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References

Figures

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Direct air cooling of a PWB with two heat-dissipating components and parallel flow
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Dimensionless temperature rise due to a point source of heat on an adiabatic surface; θ* defined in Eq. (11): U=8.5 m/s, ε=0.0025 m2 /s, Q=1 W
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Dimensionless isotherms due to a point source of heat on an adiabatic surface; θ* defined in Eq. (11): U=8.5 m/s, ε=0.0025 m2 /s, Q=1 W
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Configuration of two infinite strip sources of width 2b on an adiabatic plate
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Surface temperature rise due to two strip heat sources on an adiabatic surface: U=1.0 m/s, ε=0.0025 m2 /s, b=0.5 cm,q=0.5 W/cm2,B=1
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Dimensionless temperature rise due to a 2 cm×2 cm square source of heat; θ* as in Eq. (15): U=1.0 m/s, ε=0.0025 m2 /s, b=1.0 cm,l=1.0 cm,B=2,L=2
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Dimensionless isotherms on an adiabatic surface due to a 2 cm×2 cm square source of heat; θ* as in Eq. (15): U=1.0 m/s, ε=0.0025 m2 /s, b=1.0 cm,l=1.0 cm,B=2,L=2
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Dimensionless isotherms on an adiabatic surface due to a 2 cm×1 cm rectangular source of heat; θ* as in Eq. (15): U=1.0 m/s, ε=0.0025 m2 /s, b=1.0 cm,l=0.5 cm,B=2,L=1
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Dimensionless isotherms on an adiabatic surface due to a 1 cm×2 cm rectangular source of heat; θ* as in Eq. (15): U=1.0 m/s, ε=0.0025 m2 /s, b=0.5 cm,l=1.0 cm,B=1,L=2
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Isotherms on an adiabatic surface due to three rectangular sources: U=1.0 m/s, ε=0.0025 m2 /s
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Comparison of the spanwise centerline temperature for an infinite strip source and rectangular source at low Peclet number, Peb=5.0:b=1.0 cm,U=1.0 m/s, ε=0.002 m2 /s
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Comparison of the spanwise centerline temperature for an infinite strip source and rectangular source at high Peclet number, Peb=50.0:b=1.0 cm,U=1.0 m/s, ε=0.0002 m2 /s
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The spanwise temperature distribution across the thermal wake at various streamwise positions, normalized by the spanwise centerline temperature at that position. For the square source, b=l=1.0 cm,U=1.0 m/s, ε=0.002 m2 /s, Peb=5.0
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The spanwise temperature distribution across the thermal wake at various streamwise positions, normalized by the spanwise centerline temperature at that position. For the square source, b=l=1.0 cm,U=1.0 m/s, ε=0.0002 m2 /s, Peb=50.0
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Illustration showing the relationship between streamwise row number, N, streamwise position, x, and component spacing, s:N=x/s
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Centerline temperature rise normalized by centerline temperature rise at a downstream position x=s: 2 cm×2 cm source, U=1.0 m/s, ε=0.0025 m2 /s, Peb=4.0
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Centerline temperature rise normalized by centerline temperature rise at a downstream position x=s: s=2.4, U=1.0 m/s, ε=0.0025 m2 /s, Peb=2.4, 4.0, and 8.0
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Centerline temperature rise normalized by centerline temperature rise at a downstream position x=s:s=6.0 cm,U=1.0 m/s, ε=0.0025 m2 /s, Peb=2.4, 4.0, and 8.0
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Centerline temperature made dimensionless by total component power, Q=q(2b×2b), and far-field length scale, ε/U: comparison with point source solution, 1(2πX*)

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