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TECHNICAL PAPERS: Forced Convection

Dual Pulsating or Steady Slot Jet Cooling of a Constant Heat Flux Surface

[+] Author and Article Information
A. K. Chaniotis, D. Poulikakos, Y. Ventikos

Institute of Energy Technology, Laboratory of Thermodynamics in Emerging Technologies, ETH, Zurich, Switzerland

J. Heat Transfer 125(4), 575-586 (Jul 17, 2003) (12 pages) doi:10.1115/1.1571093 History: Received July 15, 2002; Revised February 14, 2003; Online July 17, 2003
Copyright © 2003 by ASME
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References

Figures

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Schematic representation of: (a) a single slot jet impingement on a heated surface; and (b) a pair of planar air jets impingement on a heated surface
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Maximum surface temperature as a function of time (nondimensional): (–▪–) Single jet Re=133.3, (-▪-) Single jet Re=266.6, (-⋅-▪-⋅-) Single jet Re=533.3, (–) Pair jet Re=66.6, (- -) Pair jet Re=133.3, and (-⋅-) Pair jet Re=266.6
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Variation of the surface temperature as a function of the plate position: (a) single jet, (—) Re=133.3, (- -) Re=266.6, (-⋅-) Re=533.3; (b) pair jet, (–) Re=66.6, (- -) Re=133.3, (-⋅-) Re=266.6; (and variation of the velocity near the wall as a function of the plate position) (c) single jet, (–) Re=133.3, (- -) Re=266.6, (-⋅-) Re=533.3; and (d) pair jet, (–) Re=66.6, (- -) Re=133.3, (-⋅-) Re=266.6
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Maximum surface temperature as a function of time (nondimensional): (–▪–) Steady single jet for Re=266.6, (–) Steady pair jet for Re=133.3, (–•–) Pulsating pair jet A=0.5,ω=2,φ=0 for Re=133.3, (–□–) Pulsating pair jet A=0.5,ω=2,φ=1 rad for Re=133.3, (–⋄–) Pulsating pair jet A=0.5,ω=2,φ=2 rad for Re=133.3, and (–○–) Pulsating pair jet A=0.5,ω=2,φ=3.14 rad for Re=133.3
Grahic Jump Location
Maximum surface temperature as a function of time (nondimensional): (–▪–) Steady single jet for Re=266.6, (–) Steady pair jets for Re=133.3, (–•–) Pulsating pair jets A=0.5,ω=1,φ=3.14 rad for Re=133.3, (–□–) Pulsating pair jets A=0.5,ω=2,φ=3.14 rad for Re=133.3, and (–⋄–) Pulsating pair jets A=0.5,ω=4,φ=3.14 rad for Re=133.3
Grahic Jump Location
Maximum surface temperature as function of time (nondimensional): (–▪–) Steady single jet for Re=266.6, (–) Steady pair jets for Re=133.3, (–•–) Pulsating single jets A=0.5,ω=1 for Re=133.3, (–□–) Pulsating single jets A=0.5,ω=2 for Re=133.3, and (–⋄–) Pulsating single jets A=0.5,ω=4 for Re=133.3
Grahic Jump Location
Maximum surface temperature as function of time (nondimensional): (–▪–) Steady single jet for Re=266.6, (–) Steady pair jets for Re=133.3, (–•–) Pulsating pair jets A=0.5,ω=2,φ=3.14 rad for Re=133.3, and (–⋄–) Pulsating pair jets A=1.0,ω=2,φ=3.14 rad for Re=133.3
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Pulsating pair jets A=1.0,ω=2,φ=3.14 rad for Re=133.3: (a) velocity time series, (b) temperature time series, (c) frequency (–) of the velocity and (– –) temperature, and (d) two-dimensional time delay reconstruction of the phase space
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Pulsating pair jets A=1.0,ω=2,φ=3.14 rad for Re=266.6: (a) velocity time series, (b) frequency of the velocity, and (c) two-dimensional time delay reconstruction of the phase space
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Pulsating pair jets A=1.0,ω=2,φ=3.14 rad for Re=218.6: (a) velocity time series, (b) temperature time series, (c) frequency (–) of the velocity and (– –) temperature, and (d) two-dimensional time delay reconstruction of the phase space
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Pulsating pair jets A=1.0,ω=2,φ=3.14 rad for Re=258.6, (a) velocity time series, (b) frequency spectrum of the velocity, (c) two-dimensional time delay reconstruction of the phase space n, and (d) focus of the two-dimensional time delay reconstruction of the phase space
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Pulsating pair jets A=1.0,ω=2,φ=3.14 rad for Re=533.3, (a) velocity time series, (b) frequency spectra of the velocity signal (a), (c) phase space reconstruction of (a) with time delay about one fifth of the period, (d) portion of (a), and (e) frequency spectra of the velocity signal (b)
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Pulsating pair jets A=1.0,ω=2,φ=3.14 rad for Re=533.3: (a) maximum temperature; and (b) maximum temperature using a low pass filter (1-period)
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(A) Maximum temperature of the plate, (B) Temperature of a control point as a function of Reynolds number: (–) Average temperature (A) and (B), (–○–) Maximum temperature, and ([[dotted_line]]) Minimum temperature
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Dynamic behavior for the four states identified in Fig. 14: First column: Velocity time series; Second column: Frequency spectrum of the velocity; and Third column: two-dimensional time delay reconstruction of the phase space.

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