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TECHNICAL PAPERS: Forced Convection

Time-Resolved Thermal Boundary-Layer Structure in a Pulsatile Reversing Channel Flow

[+] Author and Article Information
Sean P. Kearney

Engineering Sciences Center, 9100, Sandia National Laboratories, P.O. Box 5800, MS 0834, Albuquerque, NM 87185-0834e-mail: spkearn@sandia.gov

Anthony M. Jacobi

Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801

Robert P. Lucht

Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843

J. Heat Transfer 123(4), 655-664 (Feb 05, 2001) (10 pages) doi:10.1115/1.1372317 History: Received April 21, 2000; Revised February 05, 2001
Copyright © 2001 by ASME
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References

Figures

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Schematic of the pulsatile flow facility. The bulk flow is from left to right. Pulsations are imparted to the flow by a series of rotating vanes located upstream of the settling chamber.
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A comparison of mean square velocity profiles (pulsation kinetic energy) obtained from temperature-compensated hot-wire measurements to laminar, fully developed, pulsatile flow theory from Currie 20
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Time-resolved boundary-layer temperature and heat-flux data from a nonreversing flow
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Sample near-wall temperature profile obtained from the cold-wire data shown in the time series in Fig. 3(b). The plot shows that the nature of the deviation between the data and the least-squares fits is correlated for different cycle times.
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Time-resolved boundary-layer temperature and heat-flux data from a partially reversed flow
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Schematic of streamwise boundary-layer profiles during periodic flow reversal. The reversal initiates downstream at t=t1 and rapidly propagates upstream. Continuity-based arguments show that there must be a vertical velocity event that accompanies flow reversal.
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Time-resolved boundary-layer temperature and heat-flux data from a fully reversing channel flow
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Time-mean heat transfer data plotted against the inverse of the thermal Graetz number. The data are compared to accepted laminar heat transfer correlations obtained from Shah and Bhatti 38 and show a heat-transfer enhancement with flow pulsation in all cases. The error bars on the plot reflect a±15 percent uncertainty in time-mean Nusselt number for nonreversing and partially reversed flow and a ±25 percent uncertainty in the Nusselt number for the case of bulk flow reversal.

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