Locally averaged heat transfer measurements in a rod bundle downstream of support grids with and without flow-enhancing features are investigated for Reynolds numbers of 28,000 and 42,000. Support grids with disk blockage flow-enhancing features and support grids with split-vane pair flow enhancing features are examined. Grid pressure loss coefficients and feature loss coefficients are determined based on pressure drop measurements for each support grid design. Results indicate the greatest heat transfer enhancement downstream of the support grid designs with disk blockages. In addition, the local heat transfer measurements downstream of the split-vane pair grid designs indicate a region of decreased heat transfer below that of the hydrodynamically fully developed value. This decreased region of heat transfer is more pronounced for the lower Reynolds number case. A correlation for the local Nusselt numbers downstream of the standard support grid designs is developed based on the blockage of the support grid. In addition, a correlation for the local Nusselt numbers downstream of support grids with flow-enhancing features is developed based on the blockage ratio of the grid straps and the normalized feature loss coefficients of the support grid designs. The correlations demonstrate the tradeoff between initial heat transfer enhancement downstream of the support grid and the pressure drop created by the support grid.
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The Effect of Support Grid Features on Local, Single-Phase Heat Transfer Measurements in Rod Bundles
Mary V. Holloway,
Mary V. Holloway
Department of Mechanical Engineering, Clemson University, Clemson, SC 29634
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Heather L. McClusky,
Heather L. McClusky
Department of Mechanical Engineering, Clemson University, Clemson, SC 29634
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Donald E. Beasley, Fellow, ASME,
Donald E. Beasley, Fellow, ASME
Department of Mechanical Engineering, Clemson University, Clemson, SC 29634
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Michael E. Conner
Michael E. Conner
Westinghouse Nuclear Fuel, 5801 Bluff Road, Columbia, SC 29250
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Mary V. Holloway
Department of Mechanical Engineering, Clemson University, Clemson, SC 29634
Heather L. McClusky
Department of Mechanical Engineering, Clemson University, Clemson, SC 29634
Donald E. Beasley, Fellow, ASME
Department of Mechanical Engineering, Clemson University, Clemson, SC 29634
Michael E. Conner
Westinghouse Nuclear Fuel, 5801 Bluff Road, Columbia, SC 29250
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division December 23, 2002; revision received October 3, 2003. Associate Editor: K. S. Ball.
J. Heat Transfer. Feb 2004, 126(1): 43-53 (11 pages)
Published Online: March 10, 2004
Article history
Received:
December 23, 2002
Revised:
October 3, 2003
Online:
March 10, 2004
Citation
Holloway , M. V., McClusky , H. L., Beasley, D. E., and Conner, M. E. (March 10, 2004). "The Effect of Support Grid Features on Local, Single-Phase Heat Transfer Measurements in Rod Bundles ." ASME. J. Heat Transfer. February 2004; 126(1): 43–53. https://doi.org/10.1115/1.1643091
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